PCI2050B
PCI-to-PCI Bridge
Data Manual
October 2013
Connectivity Solutions
SCPS076G
Contents
Section
1
2
3
Title
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−1
1.1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−1
1.2
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−2
1.3
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−2
1.4
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1−2
Terminal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1
Feature/Protocol Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1
3.1
Introduction to the PCI2050B Bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1
3.1.1
Write Combining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−2
3.1.2
66-MHz Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−2
3.2
PCI Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−2
3.3
Configuration Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−3
3.4
Special Cycle Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−5
3.5
Secondary Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−5
3.6
Bus Arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−6
3.6.1
Primary Bus Arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−6
3.6.2
Internal Secondary Bus Arbitration . . . . . . . . . . . . . . . . . . . . 3−6
3.6.3
External Secondary Bus Arbitration . . . . . . . . . . . . . . . . . . . 3−7
3.7
Decode Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−7
3.8
System Error Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−7
3.8.1
Posted Write Parity Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−7
3.8.2
Posted Write Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−7
3.8.3
Target Abort on Posted Writes . . . . . . . . . . . . . . . . . . . . . . . . 3−7
3.8.4
Master Abort on Posted Writes . . . . . . . . . . . . . . . . . . . . . . . 3−8
3.8.5
Master Delayed Write Time-Out . . . . . . . . . . . . . . . . . . . . . . 3−8
3.8.6
Master Delayed Read Time-Out . . . . . . . . . . . . . . . . . . . . . . 3−8
3.8.7
Secondary SERR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−8
3.9
Parity Handling and Parity Error Reporting . . . . . . . . . . . . . . . . . . . . . . 3−8
3.9.1
Address Parity Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−8
3.9.2
Data Parity Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−8
3.10 Master and Target Abort Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−8
3.11 Discard Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−9
3.12 Delayed Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−9
3.13 Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−9
3.14 CompactPCI Hot-Swap Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−10
3.15 JTAG Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−11
3.15.1
Test Port Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−11
iii
Section
3.16
4
5
iv
Title
GPIO Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.16.1
Secondary Clock Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.16.2
Transaction Forwarding Control . . . . . . . . . . . . . . . . . . . . . . .
3.17 PCI Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.17.1
Behavior in Low-Power States . . . . . . . . . . . . . . . . . . . . . . . .
Bridge Configuration Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1
Vendor ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2
Device ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3
Command Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4
Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5
Revision ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6
Class Code Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.7
Cache Line Size Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.8
Primary Latency Timer Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9
Header Type Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.10 BIST Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.11 Base Address Register 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.12 Base Address Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.13 Primary Bus Number Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.14 Secondary Bus Number Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.15 Subordinate Bus Number Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.16 Secondary Bus Latency Timer Register . . . . . . . . . . . . . . . . . . . . . . . .
4.17 I/O Base Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.18 I/O Limit Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.19 Secondary Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.20 Memory Base Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.21 Memory Limit Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.22 Prefetchable Memory Base Register . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.23 Prefetchable Memory Limit Register . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.24 Prefetchable Base Upper 32 Bits Register . . . . . . . . . . . . . . . . . . . . . .
4.25 Prefetchable Limit Upper 32 Bits Register . . . . . . . . . . . . . . . . . . . . . .
4.26 I/O Base Upper 16 Bits Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.27 I/O Limit Upper 16 Bits Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.28 Capability Pointer Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.29 Expansion ROM Base Address Register . . . . . . . . . . . . . . . . . . . . . . . .
4.30 Interrupt Line Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.31 Interrupt Pin Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.32 Bridge Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extension Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1
Chip Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2
Extended Diagnostic Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3
Arbiter Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page
3−15
3−15
3−15
3−16
3−16
4−1
4−2
4−2
4−3
4−4
4−5
4−5
4−5
4−6
4−6
4−6
4−7
4−7
4−7
4−8
4−8
4−8
4−9
4−9
4−10
4−11
4−11
4−11
4−12
4−12
4−13
4−13
4−13
4−14
4−14
4−14
4−15
4−15
5−1
5−1
5−2
5−3
Section
6
7
Title
5.4
P_SERR Event Disable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5
GPIO Output Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6
GPIO Output Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.7
GPIO Input Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.8
Secondary Clock Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.9
P_SERR Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.10 Power-Management Capability ID Register . . . . . . . . . . . . . . . . . . . . .
5.11 Power-Management Next-Item Pointer Register . . . . . . . . . . . . . . . . .
5.12 Power-Management Capabilities Register . . . . . . . . . . . . . . . . . . . . . .
5.13 Power-Management Control/Status Register . . . . . . . . . . . . . . . . . . . .
5.14 PMCSR Bridge Support Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.15 Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.16 HS Capability ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.17 HS Next-Item Pointer Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.18 Hot-Swap Control Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.19 Diagnostics Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1
Absolute Maximum Ratings Over Operating Temperature Ranges .
6.2
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3
Electrical Characteristics Over Recommended Operating
Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4
66-MHz PCI Clock Signal AC Parameters . . . . . . . . . . . . . . . . . . . . . .
6.5
66-MHz PCI Signal Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6
Parameter Measurement Information . . . . . . . . . . . . . . . . . . . . . . . . . .
6.7
PCI Bus Parameter Measurement Information . . . . . . . . . . . . . . . . . . .
Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page
5−4
5−5
5−5
5−6
5−7
5−8
5−8
5−9
5−9
5−10
5−11
5−11
5−12
5−12
5−13
5−14
6−1
6−1
6−2
6−3
6−4
6−5
6−6
6−7
7−1
v
List of Illustrations
Figure
2−1
2−2
2−3
3−1
3−2
3−3
3−4
3−5
3−6
6−1
6−3
6−4
vi
Title
Page
PCI2050B GHK/ZHK Terminal Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−1
PCI2050B PDV Terminal Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−2
PCI2050B PPM Terminal Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−3
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−1
PCI AD31−AD0 During Address Phase of a Type 0 Configuration
Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−3
PCI AD31−AD0 During Address Phase of a Type 1 Configuration
Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−4
Bus Hierarchy and Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−4
Secondary Clock Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−6
Clock Mask Read Timing After Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−15
PCI Clock Signal AC Parameter Measurements . . . . . . . . . . . . . . . . . . . . 6−4
Load Circuit and Voltage Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6−6
RSTIN Timing Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6−7
List of Tables
Table
2−1
2−2
2−3
2−4
2−5
2−6
2−7
2−8
2−9
2−10
2−11
2−12
2−13
2−14
2−15
3−1
3−2
3−3
3−4
3−5
3−6
4−1
4−2
4−3
4−4
4−5
5−1
5−2
5−3
5−4
5−5
5−6
5−7
5−8
5−9
5−10
5−11
Title
Page
208-Terminal PDV Signal Names Sorted by Terminal Number . . . . . . . . 2−4
208-Terminal PPM Signal Names Sorted by Terminal Number . . . . . . . . 2−5
257-Terminal GHK/ZHK Signal Names Sorted by Terminal Number . . . 2−6
208-Terminal PDV Signal Names Sorted Alphabetically . . . . . . . . . . . . . . 2−8
208-Terminal PPM Signal Names Sorted Alphabetically . . . . . . . . . . . . . . 2−9
257-Terminal GHK/ZHK Signal Names Sorted Alphabetically . . . . . . . . . 2−10
Primary PCI System Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−12
Primary PCI Address and Data Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . 2−12
Primary PCI Interface Control Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−13
Secondary PCI System Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−14
Secondary PCI Address and Data Terminals . . . . . . . . . . . . . . . . . . . . . . . 2−15
Secondary PCI Interface Control Terminals . . . . . . . . . . . . . . . . . . . . . . . . . 2−16
JTAG Interface Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−16
Miscellaneous Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−17
Power Supply Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2−17
PCI Command Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−3
PCI S_AD31−S_AD16 During the Address Phase of a Type 0 Configuration
Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−5
Configuration via MS0 and MS1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−10
JTAG Instructions and Op Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−11
Boundary Scan Terminal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−11
Clock Mask Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3−15
Bridge Configuration Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4−1
Command Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4−3
Status Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4−4
Secondary Status Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4−10
Bridge Control Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4−15
Chip Control Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5−1
Extended Diagnostic Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . 5−2
Arbiter Control Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5−3
P_SERR Event Disable Register Description . . . . . . . . . . . . . . . . . . . . . . . 5−4
GPIO Output Data Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5−5
GPIO Output Enable Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . 5−5
GPIO Input Data Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5−6
Secondary Clock Control Register Description . . . . . . . . . . . . . . . . . . . . . . 5−7
P_SERR Status Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5−8
Power-Management Capabilities Register Description . . . . . . . . . . . . . . . 5−9
Power-Management Control/Status Register . . . . . . . . . . . . . . . . . . . . . . . 5−10
vii
Table
Title
5−12 PMCSR Bridge Support Register Description . . . . . . . . . . . . . . . . . . . . . . .
5−13 Hot-Swap Control Status Register Description . . . . . . . . . . . . . . . . . . . . . .
5−14 Diagnostics Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
viii
Page
5−11
5−13
5−14
1 Introduction
The Texas Instruments PCI2050B PCI-to-PCI bridge provides a high performance connection path between two
peripheral component interconnect (PCI) buses operating at a maximum bus frequency of 66-MHz. Transactions
occur between masters on one and targets on another PCI bus, and the PCI2050B bridge allows bridged transactions
to occur concurrently on both buses. The bridge supports burst mode transfers to maximize data throughput, and the
two bus traffic paths through the bridge act independently.
The PCI2050B bridge is compliant with the PCI Local Bus Specification, and can be used to overcome the electrical
loading limits of 10 devices per PCI bus and one PCI device per extension slot by creating hierarchical buses. The
PCI2050B provides two-tier internal arbitration for up to nine secondary bus masters and may be implemented with
an external bus arbiter.
The CompactPCI™ hot-swap extended PCI capability makes the PCI2050B bridge an ideal solution for multifunction
compact PCI cards and adapting single function cards to hot-swap compliance.
The PCI2050B bridge is compliant with the PCI-to-PCI Bridge Specification (Revision 1.1). The PCI2050B bridge
provides compliance for PCI Bus Power Management Interface Specification (Revision 1.1). The PCI2050B bridge
has been designed to lead the industry in power conservation and data throughput. An advanced CMOS process
achieves low system power consumption while operating at PCI clock rates up to 66-MHz.
1.1 Features
The PCI2050B bridge supports the following features:
•
Two 32-bit, 66-MHz PCI buses
•
3.3-V core logic with universal PCI interfaces compatible with 3.3-V and 5-V PCI signaling environments
•
Internal two-tier arbitration for up to nine secondary bus masters and supports an external secondary bus
arbiter
•
Ten secondary PCI clock outputs
•
Independent read and write buffers for each direction
•
Burst data transfers with pipeline architecture to maximize data throughput in both directions
•
Supports write combing for enhanced data throughput
•
Up to three delayed transactions in both directions
•
Supports the frame-to-frame delay of only four PCI clocks from one bus to another
•
Bus locking propagation
•
Predictable latency per PCI Local Bus Specification
•
Architecture configurable for PCI Bus Power Management Interface Specification
•
CompactPCI hot-swap functionality
•
Secondary bus is driven low during reset
•
VGA/palette memory and I/O decoding options
•
Advanced submicron, low-power CMOS technology
•
208-terminal PDV, 208-terminal PPM, or 257-terminal MicroStar BGA™ package
1−1
1.2 Related Documents
•
Advanced Configuration and Power Interface (ACPI) Specification (Revision 1.0)
•
IEEE Standard Test Access Port and Boundary-Scan Architecture
•
PCI Local Bus Specification (Revision 2.2)
•
PCI-to-PCI Bridge Specification (Revision 1.1)
•
PCI Bus Power Management Interface Specification (Revision 1.1)
•
PICMG CompactPCI Hot-Swap Specification (Revision 1.0)
1.3 Trademarks
CompactPCI is a trademark of PICMG − PCI Industrial Computer Manufacturers Group, Inc.
Intel is a trademark of Intel Corporation.
MicroStar BGA and TI are trademarks of Texas Instruments.
Other trademarks are the property of their respective owners.
1.4 Ordering Information
1−2
ORDERING NUMBER
VOLTAGE
TEMPERATURE
PACKAGE
PCI2050BPDV
3.3-V, 5-V Tolerant I/Os
0°C to 70°C
208 QFP
PCI2050BPPM
3.3-V, 5-V Tolerant I/Os
0°C to 70°C
208 QFP
PCI2050BGHK
3.3-V, 5-V Tolerant I/Os
0°C to 70°C
257 BGA
PCI2050BZHK
3.3-V, 5-V Tolerant I/Os
0°C to 70°C
257 RoHS BGA
PCI2050BIPDV
3.3-V, 5-V Tolerant I/Os
−40°C to 85°C
208 QFP
PCI2050BIGHK
3.3-V, 5-V Tolerant I/Os
−40°C to 85°C
257 BGA
PCI2050BIZHK
3.3-V, 5-V Tolerant I/Os
−40°C to 85°C
257 RoHS BGA
2 Terminal Descriptions
The PCI2050B device is available in four packages, a 257-terminal GHK MicroStar BGA™ package, a 257-terminal
RoHS-compliant ZHK MicroStar BGA™ package, a 208-terminal PDV package, or a 208-terminal PPM package. The
GHK and ZHK packages are mechanically and electrically identical, but the ZHK is a RoHS-compliant design.
Throughout the remainder of this manual, only the GHK package designator is used for either the GHK or the ZHK
package. Figure 2−1 is the GHK-package terminal diagram. Figure 2−2 is the PDV-package terminal diagram.
Figure 2−3 is the PPM-package terminal diagram. Table 2−1 lists terminals on the PDV packaged device in
increasing numerical order with the signal name for each. Table 2−2 lists terminals on the PPM packaged device in
increasing alphanumerical order with the signal name for each. Table 2−3 lists terminals on the GHK packaged device
in increasing alphanumerical order with the signal name for each. Table 2−4, Table 2−5, and Table 2−6 list the signal
names in alphabetical order, with corresponding terminal numbers for each package type.
W
V
U
T
R
P
N
M
L
K
J
H
G
F
E
D
C
B
A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Figure 2−1. PCI2050B GHK/ZHK Terminal Diagram
2−1
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
PCI2050B
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
VCC
S_REQ1
S_REQ2
S_REQ3
S_REQ4
S_REQ5
S_REQ6
S_REQ7
S_REQ8
S_GNT0
S_GNT1
GND
S_GNT2
S_GNT3
S_GNT4
S_GNT5
S_GNT6
S_GNT7
S_GNT8
GND
S_CLK
S_RST
S_CFN
HSSWITCH/GPIO3
GPIO2
VCC
GPIO1
GPIO0
S_CLKOUT0
S_CLKOUT1
GND
S_CLKOUT2
S_CLKOUT3
VCC
S_CLKOUT4
S_CLKOUT5
GND
S_CLKOUT6
S_CLKOUT7
VCC
S_CLKOUT8
S_CLKOUT9
P_RST
BPCCE
P_CLK
P_GNT
P_REQ
GND
P_AD31
P_AD30
VCC
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
VCC
GND
S_AD11
GND
S_AD12
S_AD13
VCC
S_AD14
S_AD15
GND
S_C/BE1
S_PAR
S_SERR
VCC
S_PERR
S_LOCK
S_STOP
GND
S_DEVSEL
S_TRDY
S_IRDY
VCC
S_FRAME
S_C/BE2
GND
S_AD16
S_AD17
VCC
S_AD18
S_AD19
GND
S_AD20
S_AD21
VCC
S_AD22
S_AD23
GND
S_C/BE3
S_AD24
VCC
S_AD25
S_AD26
GND
S_AD27
S_AD28
VCC
S_AD29
S_AD30
GND
S_AD31
S_REQ0
VCC
156
155
154
153
152
151
150
149
148
147
146
145
144
143
142
141
140
139
138
137
136
135
134
133
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
GND
MS0
S_AD10
S_M66ENA
S_AD9
VCC
S_AD8
S_C/BE0
GND
S_AD7
S_AD6
VCC
S_AD5
S_AD4
GND
S_AD3
S_AD2
VCC
S_AD1
S_AD0
GND
S_VCCP
TRST
TCK
TMS
VCC
TDO
TDI
HSLED
HSENUM
MSK_IN
CONFIG66
P_VCCP
GND
P_AD0
P_AD1
VCC
P_AD2
P_AD3
GND
P_AD4
P_AD5
VCC
P_AD6
P_AD7
GND
P_C/BE0
P_AD8
VCC
P_AD9
MS1
VCC
PDV LOW-PROFILE QUAD FLAT PACKAGE
TOP VIEW
Figure 2−2. PCI2050B PDV Terminal Diagram
2−2
GND
VCC
P_M66ENA
P_AD10
GND
P_AD11
P_AD12
VCC
P_AD13
P_AD14
GND
P_AD15
P_C/BE1
VCC
P_PAR
P_SERR
P_PERR
P_LOCK
GND
P_STOP
P_DEVSEL
P_TRDY
P_IRDY
VCC
P_FRAME
P_C/BE2
GND
P_AD16
P_AD17
VCC
P_AD18
P_AD19
GND
P_AD20
P_AD21
VCC
P_AD22
P_AD23
GND
P_IDSEL
P_C/BE3
P_AD24
VCC
P_AD25
P_AD26
GND
P_AD27
P_AD28
VCC
P_AD29
GND
VCC
PCI2050B
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
GND
VCC
P_M66ENA
P_AD10
GND
P_AD11
P_AD12
VCC
P_AD13
P_AD14
GND
P_AD15
P_C/BE1
VCC
P_PAR
P_SERR
P_PERR
P_LOCK
GND
P_STOP
P_DEVSEL
P_TRDY
P_IRDY
VCC
P_FRAME
P_C/BE2
GND
P_AD16
P_AD17
VCC
P_AD18
P_AD19
GND
P_AD20
P_AD21
VCC
P_AD22
P_AD23
GND
P_IDSEL
P_C/BE3
P_AD24
VCC
P_AD25
P_AD26
GND
P_AD27
P_AD28
VCC
P_AD29
GND
VCC
VCC
S_REQ1
S_REQ2
S_REQ3
S_REQ4
S_REQ5
S_REQ6
S_REQ7
S_REQ8
S_GNT0
S_GNT1
GND
S_GNT2
S_GNT3
S_GNT4
S_GNT5
S_GNT6
S_GNT7
S_GNT8
GND
S_CLK
S_RST
S_CFN
HSSWITCH/GPIO3
GPIO2
VCC
GPIO1
GPIO0
S_CLKOUT0
S_CLKOUT1
GND
S_CLKOUT2
S_CLKOUT3
VCC
S_CLKOUT4
S_CLKOUT5
GND
S_CLKOUT6
S_CLKOUT7
VCC
S_CLKOUT8
S_CLKOUT9
P_RST
BPCCE
P_CLK
P_GNT
P_REQ
GND
P_AD31
P_AD30
VCC
GND
VCC
GND
S_AD11
GND
S_AD12
S_AD13
VCC
S_AD14
S_AD15
GND
S_C/BE1
S_PAR
S_SERR
VCC
S_PERR
S_LOCK
S_STOP
GND
S_DEVSEL
S_TRDY
S_IRDY
VCC
S_FRAME
S_C/BE2
GND
S_AD16
S_AD17
VCC
S_AD18
S_AD19
GND
S_AD20
S_AD21
VCC
S_AD22
S_AD23
GND
S_C/BE3
S_AD24
VCC
S_AD25
S_AD26
GND
S_AD27
S_AD28
VCC
S_AD29
S_AD30
GND
S_AD31
S_REQ0
VCC
156
155
154
153
152
151
150
149
148
147
146
145
144
143
142
141
140
139
138
137
136
135
134
133
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
GND
MS0
S_AD10
S_M66ENA
S_AD9
VCC
S_AD8
S_C/BE0
GND
S_AD7
S_AD6
VCC
S_AD5
S_AD4
GND
S_AD3
S_AD2
VCC
S_AD1
S_AD0
GND
S_VCCP
TRST
TCK
TMS
VCC
TDO
TDI
HSLED
HSENUM
MSK_IN
CONFIG66
P_VCCP
GND
P_AD0
P_AD1
VCC
P_AD2
P_AD3
GND
P_AD4
P_AD5
VCC
P_AD6
P_AD7
GND
P_C/BE0
P_AD8
VCC
P_AD9
MS1
VCC
PPM QUAD FLAT PACKAGE
TOP VIEW
Figure 2−3. PCI2050B PPM Terminal Diagram
2−3
Table 2−1. 208-Terminal PDV Signal Names Sorted by Terminal Number
PDV
NO.
2−4
SIGNAL NAME
PDV
NO.
SIGNAL NAME
PDV
NO.
SIGNAL NAME
PDV
NO.
SIGNAL NAME
PDV
NO.
SIGNAL NAME
1
VCC
43
P_RST
85
P_STOP
127
HS_ENUM
169
S_SERR
2
S_REQ1
44
BPCCE
86
GND
128
HS_LED
170
VCC
3
S_REQ2
45
P_CLK
87
P_LOCK
129
TDI
171
S_PERR
4
S_REQ3
46
P_GNT
88
P_PERR
130
TDO
172
S_LOCK
5
S_REQ4
47
P_REQ
89
P_SERR
131
VCC
173
S_STOP
6
S_REQ5
48
GND
90
P_PAR
132
TMS
174
GND
7
S_REQ6
49
P_AD31
91
VCC
133
TCK
175
S_DEVSEL
8
S_REQ7
50
P_AD30
92
P_C/BE1
134
TRST
176
S_TRDY
9
S_REQ8
51
VCC
93
P_AD15
135
S_VCCP
177
S_IRDY
10
S_GNT0
52
GND
94
GND
136
GND
178
VCC
11
S_GNT1
53
VCC
95
P_AD14
137
S_AD0
179
S_FRAME
12
GND
54
GND
96
P_AD13
138
S_AD1
180
S_C/BE2
13
S_GNT2
55
P_AD29
97
VCC
139
VCC
181
GND
14
S_GNT3
56
VCC
98
P_AD12
140
S_AD2
182
S_AD16
15
S_GNT4
57
P_AD28
99
P_AD11
141
S_AD3
183
S_AD17
16
S_GNT5
58
P_AD27
100
GND
142
GND
184
VCC
17
S_GNT6
59
GND
101
P_AD10
143
S_AD4
185
S_AD18
18
S_GNT7
60
P_AD26
102
P_M66ENA
144
S_AD5
186
S_AD19
19
S_GNT8
61
P_AD25
103
VCC
145
VCC
187
GND
20
GND
62
VCC
104
GND
146
S_AD6
188
S_AD20
21
S_CLK
63
P_AD24
105
VCC
147
S_AD7
189
S_AD21
22
S_RST
64
P_C/BE3
106
MS1
148
GND
190
VCC
23
S_CFN
65
P_IDSEL
107
P_AD9
149
S_C/BE0
191
S_AD22
24
HS_SWITCH/GPIO3
66
GND
108
VCC
150
S_AD8
192
S_AD23
25
GPIO2
67
P_AD23
109
P_AD8
151
VCC
193
GND
26
VCC
68
P_AD22
110
P_C/BE0
152
S_AD9
194
S_C/BE3
27
GPIO1
69
VCC
111
GND
153
S_M66ENA
195
S_AD24
28
GPIO0
70
P_AD21
112
P_AD7
154
S_AD10
196
VCC
29
S_CLKOUT0
71
P_AD20
113
P_AD6
155
MS0
197
S_AD25
30
S_CLKOUT1
72
GND
114
VCC
156
GND
198
S_AD26
31
GND
73
P_AD19
115
P_AD5
157
VCC
199
GND
32
S_CLKOUT2
74
P_AD18
116
P_AD4
158
GND
200
S_AD27
33
S_CLKOUT3
75
VCC
117
GND
159
S_AD11
201
S_AD28
34
VCC
76
P_AD17
118
P_AD3
160
GND
202
VCC
35
S_CLKOUT4
77
P_AD16
119
P_AD2
161
S_AD12
203
S_AD29
36
S_CLKOUT5
78
GND
120
VCC
162
S_AD13
204
S_AD30
37
GND
79
P_C/BE2
121
P_AD1
163
VCC
205
GND
38
S_CLKOUT6
80
P_FRAME
122
P_AD0
164
S_AD14
206
S_AD31
39
S_CLKOUT7
81
VCC
123
GND
165
S_AD15
207
S_REQ0
40
VCC
82
P_IRDY
124
P_VCCP
166
GND
208
VCC
41
S_CLKOUT8
83
P_TRDY
125
CONFIG66
167
S_C/BE1
42
S_CLKOUT9
84
P_DEVSEL
126
MSK_IN
168
S_PAR
Table 2−2. 208-Terminal PPM Signal Names Sorted by Terminal Number
PPM
NO.
SIGNAL NAME
PPM
NO.
SIGNAL NAME
PPM
NO.
SIGNAL NAME
PPM
NO.
SIGNAL NAME
PPM
NO.
SIGNAL NAME
1
VCC
43
P_RST
85
P_STOP
127
HS_ENUM
169
S_SERR
2
S_REQ1
44
BPCCE
86
GND
128
HS_LED
170
VCC
3
S_REQ2
45
P_CLK
87
P_LOCK
129
TDI
171
S_PERR
4
S_REQ3
46
P_GNT
88
P_PERR
130
TDO
172
S_LOCK
5
S_REQ4
47
P_REQ
89
P_SERR
131
VCC
173
S_STOP
6
S_REQ5
48
GND
90
P_PAR
132
TMS
174
GND
7
S_REQ6
49
P_AD31
91
VCC
133
TCK
175
S_DEVSEL
8
S_REQ7
50
P_AD30
92
P_C/BE1
134
TRST
176
S_TRDY
9
S_REQ8
51
VCC
93
P_AD15
135
S_VCCP
177
S_IRDY
10
S_GNT0
52
GND
94
GND
136
GND
178
VCC
11
S_GNT1
53
VCC
95
P_AD14
137
S_AD0
179
S_FRAME
12
GND
54
GND
96
P_AD13
138
S_AD1
180
S_C/BE2
13
S_GNT2
55
P_AD29
97
VCC
139
VCC
181
GND
14
S_GNT3
56
VCC
98
P_AD12
140
S_AD2
182
S_AD16
15
S_GNT4
57
P_AD28
99
P_AD11
141
S_AD3
183
S_AD17
16
S_GNT5
58
P_AD27
100
GND
142
GND
184
VCC
17
S_GNT6
59
GND
101
P_AD10
143
S_AD4
185
S_AD18
18
S_GNT7
60
P_AD26
102
P_M66ENA
144
S_AD5
186
S_AD19
19
S_GNT8
61
P_AD25
103
VCC
145
VCC
187
GND
20
GND
62
VCC
104
GND
146
S_AD6
188
S_AD20
21
S_CLK
63
P_AD24
105
VCC
147
S_AD7
189
S_AD21
22
S_RST
64
P_C/BE3
106
MS1
148
GND
190
VCC
23
S_CFN
65
P_IDSEL
107
P_AD9
149
S_C/BE0
191
S_AD22
24
HS_SWITCH/GPIO3
66
GND
108
VCC
150
S_AD8
192
S_AD23
25
GPIO2
67
P_AD23
109
P_AD8
151
VCC
193
GND
26
VCC
68
P_AD22
110
P_C/BE0
152
S_AD9
194
S_C/BE3
27
GPIO1
69
VCC
111
GND
153
S_M66ENA
195
S_AD24
28
GPIO0
70
P_AD21
112
P_AD7
154
S_AD10
196
VCC
29
S_CLKOUT0
71
P_AD20
113
P_AD6
155
MS0
197
S_AD25
30
S_CLKOUT1
72
GND
114
VCC
156
GND
198
S_AD26
31
GND
73
P_AD19
115
P_AD5
157
VCC
199
GND
32
S_CLKOUT2
74
P_AD18
116
P_AD4
158
GND
200
S_AD27
33
S_CLKOUT3
75
VCC
117
GND
159
S_AD11
201
S_AD28
34
VCC
76
P_AD17
118
P_AD3
160
GND
202
VCC
35
S_CLKOUT4
77
P_AD16
119
P_AD2
161
S_AD12
203
S_AD29
36
S_CLKOUT5
78
GND
120
VCC
162
S_AD13
204
S_AD30
37
GND
79
P_C/BE2
121
P_AD1
163
VCC
205
GND
38
S_CLKOUT6
80
P_FRAME
122
P_AD0
164
S_AD14
206
S_AD31
39
S_CLKOUT7
81
VCC
123
GND
165
S_AD15
207
S_REQ0
40
VCC
82
P_IRDY
124
P_VCCP
166
GND
208
VCC
41
S_CLKOUT8
83
P_TRDY
125
CONFIG66
167
S_C/BE1
42
S_CLKOUT9
84
P_DEVSEL
126
MSK_IN
168
S_PAR
2−5
Table 2−3. 257-Terminal GHK/ZHK Signal Names Sorted by Terminal Number
GHK
NO.
†
SIGNAL NAME
A2
NC
A3
A4
A5
A6
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
C8
VCC
F11
S_FRAME
K14
TMS
VCC
C9
S_AD18
F12
S_C/BE1
K15
S_AD31
C10
NC
F13
GND
K17
S_AD28
C11
S_IRDY
F14
S_AD9
S_AD25
C12
S_LOCK
F15
S_AD10
A7
GND
C13
S_PAR
F17
S_AD8
A8
S_AD20
C14
VCC
F18
A9
VCC
C15
GND
F19
A10
S_C/BE2
C16
NC
A11
S_DEVSEL
C17
NC
A12
GND
C18
A13
VCC
A14
GND
A15
A16
GHK
NO.
SIGNAL NAME
P10
P_C/BE2
VCC
P11
P_TRDY
TDO
P12
P_LOCK
K18
TDI
P13
P_C/BE1
K19
NC
P14
P_AD12
L1
S_CLKOUT0
P15
VCC
GND
L2
S_CLKOUT1
P17
P_AD7
S_AD7
L3
NC
P18
P_AD6
G1
S_GNT3
L5
S_CLKOUT2
P19
P_AD5
G2
S_GNT2
L6
GND
R1
P_GNT
NC
G3
GND
L14
HS_LED
R2
NC
C19
NC
G5
S_REQ8
L15
HS_ENUM
R3
P_AD31
D1
NC
G6
S_REQ3
L17
MSK_IN
R6
P_AD29
S_AD13
D2
VCC
G14
S_AD6
L18
CONFIG66
R7
P_AD26
VCC
D3
NC
G15
S_C/BE0
L19
P_VCCP
R8
GND
A17
NC
D17
NC
G17
VCC
M1
S_CLKOUT3
R9
P_AD19
A18
NC
D18
NC
G18
S_AD5
M2
VCC
R10
GND
B1
NC
D19
GND
G19
S_AD4
M3
S_CLKOUT4
R11
P_DEVSEL
B2
NC
E1
S_REQ5
H1
S_GNT7
M5
GND
R12
P_PERR
B3
NC
E2
S_REQ4
H2
S_GNT6
M6
S_CLKOUT5
R13
P_AD14
B4
S_REQ0
E3
S_REQ1
H3
S_GNT5
M14
P_AD4
R14
GND
B5
S_AD29
E5†
NC
H5
S_GNT4
M15
VCC
R17
P_AD9
B6
S_AD26
E6
S_AD30
H6
S_GNT1
M17
P_AD1
R18
P_C/BE0
B7
S_C/BE3
E7
GND
H14
S_AD3
M18
P_AD0
R19
GND
B8
S_AD21
E8
S_AD23
H15
GND
M19
GND
T1
P_AD30
B9
NC
E9
GND
H17
S_AD2
N1
S_CLKOUT6
T2
VCC
B10
GND
E10
S_AD16
H18
VCC
N2
S_CLKOUT7
T3
NC
B11
S_TRDY
E11
VCC
H19
S_AD1
N3
VCC
T17
NC
B12
S_STOP
E12
S_PERR
J1
S_GNT8
N5
BPCCE
T18
VCC
B13
S_SERR
E13
S_AD15
J2
GND
N6
S_CLKOUT8
T19
MS1
B14
S_AD14
E14
S_AD11
J3
S_CLK
N14
P_AD8
U1
GND
B15
S_AD12
E17
MS0
J5
S_RST
N15
VCC
U2
NC
B16
NC
E18
S_M66ENA
J6
S_CFN
N17
GND
U3
NC
B17
NC
E19
VCC
J14
GND
N18
P_AD3
U4
NC
B18
NC
F1
S_GNT0
J15
S_AD0
N19
P_AD2
U5
GND
B19
NC
F2
S_REQ7
J17
S_VCCP
P1
S_CLKOUT9
U6
P_AD27
C1
NC
F3
S_REQ6
J18
TRST
P2
P_RST
U7
P_AD24
C2
NC
F5
S_REQ2
J19
TCK
P3
P_CLK
U8
P_AD23
C3
NC
F6
VCC
K1
HS_SWITCH/GPIO3
P5
GND
U9
GND
C4
NC
F7
VCC
K2
GPIO2
P6
P_REQ
U10
P_AD16
C5
GND
F8
S_AD22
K3
VCC
P7
VCC
U11
P_IRDY
C6
S_AD27
F9
S_AD19
K5
GPIO1
P8
VCC
U12
GND
C7
S_AD24
F10
S_AD17
K6
GPIO0
P9
P_AD18
U13
VCC
Terminal E5 is used as a key to indicate the location of the A1 corner. It is a no-connect terminal.
2−6
Table 2−3. 257-Terminal GHK/ZHK Signal Names Sorted by Terminal Number (Continued)
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
U14
P_AD13
V4
NC
V13
P_PAR
W4
VCC
W13
P_SERR
U15
P_AD10
V5
NC
V14
GND
W5
P_AD28
W14
P_AD15
U16
NC
V6
GND
V15
P_AD11
W6
P_AD25
W15
VCC
U17
NC
V7
P_C/BE3
V16
VCC
W7
P_IDSEL
W16
P_M66ENA
U18
NC
V8
P_AD22
V17
NC
W8
VCC
W17
NC
U19
NC
V9
P_AD20
V18
NC
W9
P_AD21
W18
NC
V1
NC
V10
P_AD17
V19
NC
W10
VCC
V2
NC
V11
VCC
W2
NC
W11
P_FRAME
V3
NC
V12
NC
W3
NC
W12
P_STOP
2−7
Table 2−4. 208-Terminal PDV Signal Names Sorted Alphabetically
SIGNAL NAME
PDV
NO.
SIGNAL NAME
PDV
NO.
SIGNAL NAME
PDV
NO.
SIGNAL NAME
PDV
NO.
SIGNAL NAME
PDV
NO.
BPCCE
44
P_AD0
122
P_LOCK
87
S_C/BE0
149
S_SERR
169
CONFIG66
125
P_AD1
121
P_M66ENA
102
S_C/BE1
167
S_STOP
173
GND
12
P_AD2
119
P_PAR
90
S_C/BE2
180
S_TRDY
176
GND
20
P_AD3
118
P_PERR
88
S_C/BE3
194
S_VCCP
135
GND
31
P_AD4
116
P_REQ
47
S_CFN
23
TCK
133
GND
37
P_AD5
115
P_RST
43
S_CLK
21
TDI
129
GND
48
P_AD6
113
P_SERR
89
S_CLKOUT0
29
TDO
130
GND
52
P_AD7
112
P_STOP
85
S_CLKOUT1
30
TMS
132
GND
54
P_AD8
109
P_TRDY
83
S_CLKOUT2
32
TRST
134
GND
59
P_AD9
107
P_VCCP
124
S_CLKOUT3
33
VCC
1
GND
66
P_AD10
101
S_AD0
137
S_CLKOUT4
35
VCC
26
GND
72
P_AD11
99
S_AD1
138
S_CLKOUT5
36
VCC
34
GND
78
P_AD12
98
S_AD2
140
S_CLKOUT6
38
VCC
40
GND
86
P_AD13
96
S_AD3
141
S_CLKOUT7
39
VCC
51
GND
94
P_AD14
95
S_AD4
143
S_CLKOUT8
41
VCC
53
GND
100
P_AD15
93
S_AD5
144
S_CLKOUT9
42
VCC
56
GND
104
P_AD16
77
S_AD6
146
S_DEVSEL
175
VCC
62
GND
111
P_AD17
76
S_AD7
147
S_FRAME
179
VCC
69
GND
117
P_AD18
74
S_AD8
150
S_GNT0
10
VCC
75
GND
123
P_AD19
73
S_AD9
152
S_GNT1
11
VCC
81
GND
136
P_AD20
71
S_AD10
154
S_GNT2
13
VCC
91
GND
142
P_AD21
70
S_AD11
159
S_GNT3
14
VCC
97
GND
148
P_AD22
68
S_AD12
161
S_GNT4
15
VCC
103
GND
156
P_AD23
67
S_AD13
162
S_GNT5
16
VCC
105
GND
158
P_AD24
63
S_AD14
164
S_GNT6
17
VCC
108
GND
160
P_AD25
61
S_AD15
165
S_GNT7
18
VCC
114
GND
166
P_AD26
60
S_AD16
182
S_GNT8
19
VCC
120
GND
174
P_AD27
58
S_AD17
183
S_IRDY
177
VCC
131
GND
181
P_AD28
57
S_AD18
185
S_LOCK
172
VCC
139
GND
187
P_AD29
55
S_AD19
186
S_M66ENA
153
VCC
145
GND
193
P_AD30
50
S_AD20
188
S_PAR
168
VCC
151
GND
199
P_AD31
49
S_AD21
189
S_PERR
171
VCC
202
GND
205
P_C/BE0
110
S_AD22
191
S_REQ0
207
VCC
208
GPIO0
28
P_C/BE1
92
S_AD23
192
S_REQ1
2
VCC
157
GPIO1
27
P_C/BE2
79
S_AD24
195
S_REQ2
3
VCC
163
GPIO2
25
P_C/BE3
64
S_AD25
197
S_REQ3
4
VCC
170
HS_ENUM
127
P_CLK
45
S_AD26
198
S_REQ4
5
VCC
178
HS_LED
128
P_DEVSEL
84
S_AD27
200
S_REQ5
6
VCC
184
HS_SWITCH/GPIO3
24
P_FRAME
80
S_AD28
201
S_REQ6
7
VCC
190
MS0
155
P_GNT
46
S_AD29
203
S_REQ7
8
VCC
196
MS1
106
P_IDSEL
65
S_AD30
204
S_REQ8
9
MSK_IN
126
P_IRDY
82
S_AD31
206
S_RST
22
2−8
Table 2−5. 208-Terminal PPM Signal Names Sorted Alphabetically
SIGNAL NAME
PPM
NO.
SIGNAL NAME
PPM
NO.
SIGNAL NAME
PPM
NO.
SIGNAL NAME
PPM
NO.
SIGNAL NAME
PPM
NO.
BPCCE
44
P_AD0
122
P_LOCK
87
S_C/BE0
149
S_SERR
169
CONFIG66
125
P_AD1
121
P_M66ENA
102
S_C/BE1
167
S_STOP
173
GND
12
P_AD2
119
P_PAR
90
S_C/BE2
180
S_TRDY
176
GND
20
P_AD3
118
P_PERR
88
S_C/BE3
194
S_VCCP
135
GND
31
P_AD4
116
P_REQ
47
S_CFN
23
TCK
133
GND
37
P_AD5
115
P_RST
43
S_CLK
21
TDI
129
GND
48
P_AD6
113
P_SERR
89
S_CLKOUT0
29
TDO
130
GND
52
P_AD7
112
P_STOP
85
S_CLKOUT1
30
TMS
132
GND
54
P_AD8
109
P_TRDY
83
S_CLKOUT2
32
TRST
134
GND
59
P_AD9
107
P_VCCP
124
S_CLKOUT3
33
VCC
1
GND
66
P_AD10
101
S_AD0
137
S_CLKOUT4
35
VCC
26
GND
72
P_AD11
99
S_AD1
138
S_CLKOUT5
36
VCC
34
GND
78
P_AD12
98
S_AD2
140
S_CLKOUT6
38
VCC
40
GND
86
P_AD13
96
S_AD3
141
S_CLKOUT7
39
VCC
51
GND
94
P_AD14
95
S_AD4
143
S_CLKOUT8
41
VCC
53
GND
100
P_AD15
93
S_AD5
144
S_CLKOUT9
42
VCC
56
GND
104
P_AD16
77
S_AD6
146
S_DEVSEL
175
VCC
62
GND
111
P_AD17
76
S_AD7
147
S_FRAME
179
VCC
69
GND
117
P_AD18
74
S_AD8
150
S_GNT0
10
VCC
75
GND
123
P_AD19
73
S_AD9
152
S_GNT1
11
VCC
81
GND
136
P_AD20
71
S_AD10
154
S_GNT2
13
VCC
91
GND
142
P_AD21
70
S_AD11
159
S_GNT3
14
VCC
97
GND
148
P_AD22
68
S_AD12
161
S_GNT4
15
VCC
103
GND
156
P_AD23
67
S_AD13
162
S_GNT5
16
VCC
105
GND
158
P_AD24
63
S_AD14
164
S_GNT6
17
VCC
108
GND
160
P_AD25
61
S_AD15
165
S_GNT7
18
VCC
114
GND
166
P_AD26
60
S_AD16
182
S_GNT8
19
VCC
120
GND
174
P_AD27
58
S_AD17
183
S_IRDY
177
VCC
131
GND
181
P_AD28
57
S_AD18
185
S_LOCK
172
VCC
139
GND
187
P_AD29
55
S_AD19
186
S_M66ENA
153
VCC
145
GND
193
P_AD30
50
S_AD20
188
S_PAR
168
VCC
151
GND
199
P_AD31
49
S_AD21
189
S_PERR
171
VCC
202
GND
205
P_C/BE0
110
S_AD22
191
S_REQ0
207
VCC
208
GPIO0
28
P_C/BE1
92
S_AD23
192
S_REQ1
2
VCC
157
GPIO1
27
P_C/BE2
79
S_AD24
195
S_REQ2
3
VCC
163
GPIO2
25
P_C/BE3
64
S_AD25
197
S_REQ3
4
VCC
170
HS_ENUM
127
P_CLK
45
S_AD26
198
S_REQ4
5
VCC
178
HS_LED
128
P_DEVSEL
84
S_AD27
200
S_REQ5
6
VCC
184
HS_SWITCH/GPIO3
24
P_FRAME
80
S_AD28
201
S_REQ6
7
VCC
190
MS0
155
P_GNT
46
S_AD29
203
S_REQ7
8
VCC
196
MS1
106
P_IDSEL
65
S_AD30
204
S_REQ8
9
MSK_IN
126
P_IRDY
82
S_AD31
206
S_RST
22
2−9
Table 2−6. 257-Terminal GHK/ZHK Signal Names Sorted Alphabetically
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
W11
S_AD29
B5
R1
S_AD30
E6
BPCCE
N5
NC
A18
NC
V19
P_FRAME
CONFIG66
L18
NC
B1
NC
W2
P_GNT
GND
A7
NC
B2
NC
W3
P_IDSEL
W7
S_AD31
A4
GND
A12
NC
B3
NC
W17
P_IRDY
U11
S_CFN
J6
GND
A14
NC
B9
NC
W18
P_LOCK
P12
S_CLK
J3
GND
B10
NC
B16
P_AD0
M18
P_M66ENA
W16
S_CLKOUT0
L1
GND
C5
NC
B17
P_AD1
M17
P_PAR
V13
S_CLKOUT1
L2
GND
C15
NC
B18
P_AD2
N19
P_PERR
R12
S_CLKOUT2
L5
GND
D19
NC
B19
P_AD3
N18
P_REQ
P6
S_CLKOUT3
M1
GND
E7
NC
C1
P_AD4
M14
P_RST
P2
S_CLKOUT4
M3
GND
E9
NC
C2
P_AD5
P19
P_SERR
W13
S_CLKOUT5
M6
GND
F13
NC
C3
P_AD6
P18
P_STOP
W12
S_CLKOUT6
N1
GND
F18
NC
C4
P_AD7
P17
P_TRDY
P11
S_CLKOUT7
N2
GND
G3
NC
C10
P_AD8
N14
P_VCCP
L19
S_CLKOUT8
N6
GND
H15
NC
C16
P_AD9
R17
S_AD0
J15
S_CLKOUT9
P1
GND
J2
NC
C17
P_AD10
U15
S_AD1
H19
S_C/BE0
GND
J14
NC
C18
P_AD11
V15
S_AD2
H17
S_C/BE1
F12
GND
L6
NC
C19
P_AD12
P14
S_AD3
H14
S_C/BE2
A10
GND
M5
NC
D1
P_AD13
U14
S_AD4
G19
S_C/BE3
B7
GND
M19
NC
D3
P_AD14
R13
S_AD5
G18
S_DEVSEL
A11
GND
N17
NC
D17
P_AD15
W14
S_AD6
G14
S_FRAME
F11
GND
P5
NC
D18
P_AD16
U10
S_AD7
F19
S_GNT0
F1
GND
R8
NC
E5
P_AD17
V10
S_AD8
F17
S_GNT1
H6
GND
R10
NC
K19
P_AD18
P9
S_AD9
F14
S_GNT2
G2
GND
R14
NC
L3
P_AD19
R9
S_AD10
F15
S_GNT3
G1
GND
R19
NC
R2
P_AD20
V9
S_AD11
E14
S_GNT4
H5
GND
U1
NC
T3
P_AD21
W9
S_AD12
B15
S_GNT5
H3
GND
U5
NC
T17
P_AD22
V8
S_AD13
A15
S_GNT6
H2
GND
U9
NC
U2
P_AD23
U8
S_AD14
B14
S_GNT7
H1
GND
U12
NC
U3
P_AD24
U7
S_AD15
E13
S_GNT8
J1
GND
V6
NC
U4
P_AD25
W6
S_AD16
E10
S_IRDY
C11
GND
V14
NC
U16
P_AD26
R7
S_AD17
F10
S_LOCK
C12
GPIO0
K6
NC
U17
P_AD27
U6
S_AD18
C9
S_M66ENA
E18
GPIO1
K5
NC
U18
P_AD28
W5
S_AD19
F9
S_PAR
C13
GPIO2
K2
NC
U19
P_AD29
R6
S_AD20
A8
S_PERR
E12
HS_ENUM
L15
NC
V1
P_AD30
T1
S_AD21
B8
S_REQ0
B4
HS_LED
L14
NC
V2
P_AD31
R3
S_AD22
F8
S_REQ1
E3
HS_SWITCH/GPIO3
K1
NC
V3
P_CLK
P3
S_AD23
E8
S_REQ2
F5
MSK_IN
L17
NC
V4
P_C/BE0
R18
S_AD24
C7
S_REQ3
G6
MS0
E17
NC
V5
P_C/BE1
P13
S_AD25
A6
S_REQ4
E2
MS1
T19
NC
V12
P_C/BE2
P10
S_AD26
B6
S_REQ5
E1
NC
A2
NC
V17
P_C/BE3
V7
S_AD27
C6
S_REQ6
F3
NC
A17
NC
V18
P_DEVSEL
R11
S_AD28
A5
S_REQ7
F2
2−10
G15
Table 2−6. 257-Terminal GHK/ZHK Signal Names Sorted Alphabetically (Continued)
SIGNAL NAME
S_REQ8
S_RST
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
GHK
NO.
SIGNAL NAME
G5
TMS
K14
VCC
E11
VCC
J5
GHK
NO.
SIGNAL NAME
GHK
NO.
M2
VCC
V11
TRST
J18
VCC
E19
VCC
N3
VCC
V16
S_SERR
B13
VCC
A3
VCC
F6
VCC
N15
VCC
W4
S_STOP
B12
VCC
A9
VCC
F7
VCC
P7
VCC
W8
S_TRDY
B11
VCC
A13
VCC
M15
VCC
P8
VCC
W10
S_VCCP
J17
VCC
A16
VCC
G17
VCC
P15
VCC
W15
TCK
J19
VCC
C8
VCC
H18
VCC
T2
TDI
K18
VCC
C14
VCC
K3
VCC
T18
TDO
K17
VCC
D2
VCC
K15
VCC
U13
2−11
The terminals are grouped in tables by functionality, such as PCI system function and power-supply function (see
Table 2−7 through Table 2−15). The terminal numbers also are listed for convenient reference.
Table 2−7. Primary PCI System Terminals
TERMINAL
NAME
PDV/
PPM
NO.
GHK/
ZHK
NO.
I/O
DESCRIPTION
P_CLK
45
P3
I
Primary PCI bus clock. P_CLK provides timing for all transactions on the primary PCI bus. All primary PCI
signals are sampled at rising edge of P_CLK.
P_RST
43
P2
I
PCI reset. When the primary PCI bus reset is asserted, P_RST causes the bridge to put all output buffers
in a high-impedance state and reset all internal registers. When asserted, the device is completely
nonfunctional. During P_RST, the secondary interface is driven low. After P_RST is deasserted, the bridge
is in its default state.
Table 2−8. Primary PCI Address and Data Terminals
TERMINAL
2−12
NAME
PDV/
PPM
NO.
GHK/
ZHK
NO.
P_AD31
P_AD30
P_AD29
P_AD28
P_AD27
P_AD26
P_AD25
P_AD24
P_AD23
P_AD22
P_AD21
P_AD20
P_AD19
P_AD18
P_AD17
P_AD16
P_AD15
P_AD14
P_AD13
P_AD12
P_AD11
P_AD10
P_AD9
P_AD8
P_AD7
P_AD6
P_AD5
P_AD4
P_AD3
P_AD2
P_AD1
P_AD0
49
50
55
57
58
60
61
63
67
68
70
71
73
74
76
77
93
95
96
98
99
101
107
109
112
113
115
116
118
119
121
122
R3
T1
R6
W5
U6
R7
W6
U7
U8
V8
W9
V9
R9
P9
V10
U10
W14
R13
U14
P14
V15
U15
R17
N14
P17
P18
P19
M14
N18
N19
M17
M18
P_C/BE3
P_C/BE2
P_C/BE1
P_C/BE0
64
79
92
110
V7
P10
P13
R18
I/O
DESCRIPTION
I/O
Primary address/data bus. These signals make up the multiplexed PCI address and data bus on the
primary interface. During the address phase of a primary bus PCI cycle, P_AD31−P_AD0 contain a
32-bit address or other destination information. During the data phase, P_AD31−P_AD0 contain data.
I/O
Primary bus commands and byte enables. These signals are multiplexed on the same PCI terminals.
During the address phase of a primary bus PCI cycle, P_C/BE3−P_C/BE0 define the bus command.
During the data phase, this 4-bit bus is used as byte enables. The byte enables determine which byte
paths of the full 32-bit data bus carry meaningful data. P_C/BE0 applies to byte 0 (P_AD7−P_AD0),
P_C/BE1 applies to byte 1 (P_AD15−P_AD8), P_C/BE2 applies to byte 2 (P_AD23−P_AD16), and
P_C/BE3 applies to byte 3 (P_AD31−P_AD24).
Table 2−9. Primary PCI Interface Control Terminals
TERMINAL
NAME
PDV/
PPM
NO.
GHK/
ZHK
NO.
I/O
DESCRIPTION
P_DEVSEL
84
R11
I/O
Primary device select. The bridge asserts P_DEVSEL to claim a PCI cycle as the target device. As
a PCI master on the primary bus, the bridge monitors P_DEVSEL until a target responds. If no target
responds before time-out occurs, then the bridge terminates the cycle with a master abort.
P_FRAME
80
W11
I/O
Primary cycle frame. P_FRAME is driven by the master of a primary bus cycle. P_FRAME is asserted
to indicate that a bus transaction is beginning, and data transfers continue while this signal is asserted.
When P_FRAME is deasserted, the primary bus transaction is in the final data phase.
P_GNT
46
R1
I
Primary bus grant to bridge. P_GNT is driven by the primary PCI bus arbiter to grant the bridge access
to the primary PCI bus after the current data transaction has completed. P_GNT may or may not follow
a primary bus request, depending on the primary bus arbitration algorithm.
P_IDSEL
65
W7
I
Primary initialization device select. P_IDSEL selects the bridge during configuration space accesses.
P_IDSEL can be connected to one of the upper 24 PCI address lines on the primary PCI bus.
Note: There is no IDSEL signal interfacing the secondary PCI bus; thus, the entire configuration space
of the bridge can only be accessed from the primary bus.
P_IRDY
82
U11
I/O
Primary initiator ready. P_IRDY indicates ability of the primary bus master to complete the current data
phase of the transaction. A data phase is completed on a rising edge of P_CLK where both P_IRDY
and P_TRDY are asserted. Until P_IRDY and P_TRDY are both sampled asserted, wait states are
inserted.
P_LOCK
87
P12
I/O
Primary PCI bus lock. P_LOCK is used to lock the primary bus and gain exclusive access as a bus
master.
P_PAR
90
V13
I/O
Primary parity. In all primary bus read and write cycles, the bridge calculates even parity across the
P_AD and P_C/BE buses. As a bus master during PCI write cycles, the bridge outputs this parity
indicator with a one-P_CLK delay. As a target during PCI read cycles, the calculated parity is compared
to the parity indicator of the master; a miscompare can result in a parity error assertion (P_PERR).
P_PERR
88
R12
I/O
Primary parity error indicator. P_PERR is driven by a primary bus PCI device to indicate that calculated
parity does not match P_PAR when P_PERR is enabled through bit 6 of the command register (PCI
offset 04h, see Section 4.3).
P_REQ
47
P6
O
Primary PCI bus request. Asserted by the bridge to request access to the primary PCI bus as a master.
P_SERR
89
W13
O
Primary system error. Output pulsed from the bridge when enabled through bit 8 of the command
register (PCI offset 04h, see Section 4.3) indicating a system error has occurred. The bridge needs
not be the target of the primary PCI cycle to assert this signal. When bit 6 is enabled in the bridge control
register (PCI offset 3Eh, see Section 4.32), this signal also pulses, indicating that a system error has
occurred on one of the subordinate buses downstream from the bridge.
P_STOP
85
W12
I/O
Primary cycle stop signal. This signal is driven by a PCI target to request that the master stop the
current primary bus transaction. This signal is used for target disconnects and is commonly asserted
by target devices which do not support burst data transfers.
P_TRDY
83
P11
I/O
Primary target ready. P_TRDY indicates the ability of the primary bus target to complete the current
data phase of the transaction. A data phase is completed upon a rising edge of P_CLK where both
P_IRDY and P_TRDY are asserted. Until both P_IRDY and P_TRDY are asserted, wait states are
inserted.
2−13
Table 2−10. Secondary PCI System Terminals
TERMINAL
NAME
PDV/
PPM
NO.
GHK/
ZHK
NO.
S_CLKOUT9
S_CLKOUT8
S_CLKOUT7
S_CLKOUT6
S_CLKOUT5
S_CLKOUT4
S_CLKOUT3
S_CLKOUT2
S_CLKOUT1
S_CLKOUT0
42
41
39
38
36
35
33
32
30
29
S_CLK
21
2−14
I/O
DESCRIPTION
P1
N6
N2
N1
M6
M3
M1
L5
L2
L1
O
Secondary PCI bus clocks. Provide timing for all transactions on the secondary PCI bus. Each
secondary bus device samples all secondary PCI signals at the rising edge of its corresponding
S_CLKOUT input.
J3
I
Secondary PCI bus clock input. This input synchronizes the PCI2050B device to the secondary bus
clocks.
S_CFN
23
J6
I
Secondary external arbiter enable. When this signal is high, the secondary external arbiter is enabled.
When the external arbiter is enabled, the PCI2050B S_REQ0 terminal is reconfigured as a secondary
bus grant input to the bridge and S_GNT0 is reconfigured as a secondary bus master request to the
external arbiter on the secondary bus.
S_RST
22
J5
O
Secondary PCI reset. S_RST is a logical OR of P_RST and the state of the secondary bus reset bit
(bit 6) of the bridge control register (PCI offset 3Eh, see Section 4.32). S_RST is asynchronous with
respect to the state of the secondary interface CLK signal.
Table 2−11. Secondary PCI Address and Data Terminals
TERMINAL
NAME
PDV/
PPM
NO.
GHK/
ZHK
NO.
S_AD31
S_AD30
S_AD29
S_AD28
S_AD27
S_AD26
S_AD25
S_AD24
S_AD23
S_AD22
S_AD21
S_AD20
S_AD19
S_AD18
S_AD17
S_AD16
S_AD15
S_AD14
S_AD13
S_AD12
S_AD11
S_AD10
S_AD9
S_AD8
S_AD7
S_AD6
S_AD5
S_AD4
S_AD3
S_AD2
S_AD1
S_AD0
206
204
203
201
200
198
197
195
192
191
189
188
186
185
183
182
165
164
162
161
159
154
152
150
147
146
144
143
141
140
138
137
A4
E6
B5
A5
C6
B6
A6
C7
E8
F8
B8
A8
F9
C9
F10
E10
E13
B14
A15
B15
E14
F15
F14
F17
F19
G14
G18
G19
H14
H17
H19
J15
S_C/BE3
S_C/BE2
S_C/BE1
S_C/BE0
194
180
167
149
S_DEVSEL
I/O
DESCRIPTION
I/O
Secondary address/data bus. These signals make up the multiplexed PCI address and data bus on
the secondary interface. During the address phase of a secondary bus PCI cycle, S_AD31−S_AD0
contain a 32-bit address or other destination information. During the data phase, S_AD31−S_AD0
contain data.
B7
A10
F12
G15
I/O
Secondary bus commands and byte enables. These signals are multiplexed on the same PCI
terminals. During the address phase of a secondary bus PCI cycle, S_C/BE3−S_C/BE0 define the bus
command. During the data phase, this 4-bit bus is used as byte enables. The byte enables determine
which byte paths of the full 32-bit data bus carry meaningful data. S_C/BE0 applies to byte 0
(S_AD7−S_AD0), S_C/BE1 applies to byte 1 (S_AD15−S_AD8), S_C/BE2 applies to byte 2
(S_AD23−S_AD16), and S_C/BE3 applies to byte 3 (S_AD31−S_AD24).
175
A11
I/O
Secondary device select. The bridge asserts S_DEVSEL to claim a PCI cycle as the target device. As
a PCI master on the secondary bus, the bridge monitors S_DEVSEL until a target responds. If no target
responds before time-out occurs, then the bridge terminates the cycle with a master abort.
S_FRAME
179
F11
I/O
Secondary cycle frame. S_FRAME is driven by the master of a secondary bus cycle. S_FRAME is
asserted to indicate that a bus transaction is beginning and data transfers continue while S_FRAME
is asserted. When S_FRAME is deasserted, the secondary bus transaction is in the final data phase.
S_GNT8
S_GNT7
S_GNT6
S_GNT5
S_GNT4
S_GNT3
S_GNT2
S_GNT1
S_GNT0
19
18
17
16
15
14
13
11
10
J1
H1
H2
H3
H5
G1
G2
H6
F1
O
Secondary bus grant to the bridge. The bridge provides internal arbitration and these signals are used
to grant potential secondary PCI bus masters access to the bus. Ten potential masters (including the
bridge) can be located on the secondary PCI bus.
When the internal arbiter is disabled, S_GNT0 is reconfigured as an external secondary bus request
signal for the bridge.
2−15
Table 2−12. Secondary PCI Interface Control Terminals
TERMINAL
NAME
PDV/
PPM
NO.
GHK/
ZHK
NO.
I/O
DESCRIPTION
S_IRDY
177
C11
I/O
Secondary initiator ready. S_IRDY indicates the ability of the secondary bus master to complete the
current data phase of the transaction. A data phase is completed on a rising edge of S_CLK where both
S_IRDY and S_TRDY are asserted; until S_IRDY and S_TRDY are asserted, wait states are inserted.
S_LOCK
172
C12
I/O
Secondary PCI bus lock. S_LOCK is used to lock the secondary bus and gain exclusive access as a
master.
S_PAR
168
C13
I/O
Secondary parity. In all secondary bus read and write cycles, the bridge calculates even parity across
the S_AD and S_C/BE buses. As a master during PCI write cycles, the bridge outputs this parity indicator
with a one-S_CLK delay. As a target during PCI read cycles, the calculated parity is compared to the
master parity indicator. A miscompare can result in a parity error assertion (S_PERR).
S_PERR
171
E12
I/O
Secondary parity error indicator. S_PERR is driven by a secondary bus PCI device to indicate that
calculated parity does not match S_PAR when enabled through the command register (PCI offset 04h,
see Section 4.3).
S_REQ8
S_REQ7
S_REQ6
S_REQ5
S_REQ4
S_REQ3
S_REQ2
S_REQ1
S_REQ0
9
8
7
6
5
4
3
2
207
G5
F2
F3
E1
E2
G6
F5
E3
B4
I
S_SERR
169
B13
I
Secondary system error. S_SERR is passed through the primary interface by the bridge if enabled
through the bridge control register (PCI offset 3Eh, see Section 4.32). S_SERR is never asserted by the
bridge.
S_STOP
173
B12
I/O
Secondary cycle stop signal. S_STOP is driven by a PCI target to request that the master stop the current
secondary bus transaction. S_STOP is used for target disconnects and is commonly asserted by target
devices that do not support burst data transfers.
S_TRDY
176
B11
I/O
Secondary target ready. S_TRDY indicates the ability of the secondary bus target to complete the
current data phase of the transaction. A data phase is completed on a rising edge of S_CLK where both
S_IRDY and S_TRDY are asserted; until S_IRDY and S_TRDY are asserted, wait states are inserted.
Secondary PCI bus request signals. The bridge provides internal arbitration, and these signals are used
as inputs from secondary PCI bus masters requesting the bus. Ten potential masters (including the
bridge) can be located on the secondary PCI bus.
When the internal arbiter is disabled, the S_REQ0 signal is reconfigured as an external secondary bus
grant for the bridge.
Table 2−13. JTAG Interface Terminals
TERMINAL
2−16
NAME
PDV/
PPM
NO.
GHK/
ZHK
NO.
I/O
TCK
133
J19
I
JTAG boundary-scan clock. TCK is the clock controlling the JTAG logic.
TDI
129
K18
I
JTAG serial data in. TDI is the serial input through which JTAG instructions and test data enter the JTAG
interface. The new data on TDI is sampled on the rising edge of TCK.
TDO
130
K17
O
JTAG serial data out. TDO is the serial output through which test instructions and data from the test logic
leave the PCI2050B device.
TMS
132
K14
I
JTAG test mode select. TMS causes state transitions in the test access port controller.
TRST
134
J18
I
JTAG TAP reset. When TRST is asserted low, the TAP controller is asynchronously forced to enter a
reset state and initialize the test logic.
DESCRIPTION
Table 2−14. Miscellaneous Terminals
TERMINAL
PDV/
PPM
NO.
NAME
GHK/
ZHK
NO.
I/O
DESCRIPTION
BPCCE
44
N5
I
Bus/power clock control management terminal. When this terminal is tied high and the
PCI2050B device is placed in the D3 power state, it enables the PCI2050B device to place the
secondary bus in the B2 power state. The PCI2050Bdevice disables the secondary clocks and
drives them to 0. When tied low, placing the PCI2050B device in the D3 power state has no
effect on the secondary bus clocks.
CONFIG66
125
L18
I
Configure 66 MHz operation. This input-only terminal is used to specify if the PCI2050B device
is capable of running at 66 MHz. If this terminal is tied high, then device can be run at 66 MHz.
If this terminal is tied low, then the PCI2050B device can only function under the 33-MHz PCI
configuration.
GPIO3/HS_SWITCH
GPIO2
GPIO1
GPIO0
24
25
27
28
K1
K2
K5
K6
I
HS_ENUM
127
L15
O
Hot-swap ENUM
HS_LED
128
L14
O
Hot-swap LED output
MS0
155
E17
I
Mode select 0
MS1
106
T19
I
Mode select 1
I
Primary interface 66 MHz enable. This input-only signal designates the primary interface bus
speed. This terminal must be pulled low for 33-MHz operation on the primary bus. In this case,
S_M66ENA signal will be driven low by the PCI2050B device, forcing the secondary bus to
run at 33 MHz. For 66-MHz operation, this terminal must be pulled high.
I/O
Secondary 66 MHz enable. This signal designates the secondary bus speed. If the
P_M66ENA is driven low, then this signal is driven low by the PCI2050B device, forcing
secondary bus to run at 33 MHz. If the primary bus is running at 66 MHz (P_M66ENA is high),
then S_M66ENA is an input and must be externally pulled high for the secondary bus to
operate at 66 MHz or pulled low for secondary bus to operate at 33 MHz. Note that S_M66ENA
is an open drained output.
P_M66ENA
S_M66ENA
102
153
General-purpose I/O terminals
HS_SWITCH provides the status of the ejector handle switch to the cPCI logic.
W16
E18
GPIO3 is HS_SWITCH in cPCI mode.
Table 2−15. Power Supply Terminals
TERMINAL
DESCRIPTION
NAME
PDV/PPM NO.
GHK NO.
GND
12, 20, 31, 37, 48, 52, 54,
59, 66, 72, 78, 86, 94, 100,
104, 111, 117, 123, 136,
142, 148, 156, 158, 160,
166, 174, 181, 187, 193,
199, 205
A7, A12, A14, B10, C5,
C15, D19, E7, E9, F13,
F18, G3, H15, J2, J14, L6,
M5, M19, N17, P5, R8,
R10, R14, R19, U1, U5, U9,
U12, V6, V14
Device ground terminals
VCC
1, 26, 34, 40, 51, 53, 56, 62,
69, 75, 81, 91, 97, 103, 105,
108, 114, 120, 131, 139,
145, 151, 157, 163, 170,
178, 184, 190, 196, 202,
208
A3, A9, A13, A16, C8, C14,
D2, E11, E19, F6, F7, M15,
G17, H18, K3, K15, M2, N3,
N15, P7, P8, P15, T2, T18,
U13, V11, V16, W4, W8,
W10, W15
Power-supply terminal for core logic (3.3 V)
P_VCCP(1)
124
L19
Primary bus-signaling environment supply. P_VCCP is used in
protection circuitry on primary bus I/O signals.
S_VCCP(1)
135
J17
Secondary bus-signaling environment supply. S_VCCP is used in
protection circuitry on secondary bus I/O signals.
NOTE 1: TI recommends that P_VCCP and S_VCCP be powered up first before applying power to VCC.
2−17
2−18
3 Feature/Protocol Descriptions
The following sections give an overview of the PCI2050B PCI-to-PCI bridge features and functionality. Figure 3−1
shows a simplified block diagram of a typical system implementation using the PCI2050B bridge.
CPU
Host Bus
Host
Bridge
Memory
PCI
Device
PCI
Device
PCI Bus 0
PCI Option Card
PCI2050B
PCI Option Card
PCI Bus 2
PCI Bus 1
PCI2050B
PCI
Device
PCI
Device
(Option)
PCI Option Slot
Figure 3−1. System Block Diagram
3.1 Introduction to the PCI2050B Bridge
The PCI2050B device is a bridge between two PCI buses and is compliant with both the PCI Local Bus Specification
and the PCI-to-PCI Bridge Specification. The bridge supports two 32-bit PCI buses operating at a maximum of
66 MHz. The primary and secondary buses operate independently in either 3.3-V or 5-V signaling environment. The
core logic of the bridge, however, is powered at 3.3 V to reduce power consumption.
For PCI2050B, the FIFO size is 32 DW for delayed responses (3 each direction) 64 DW posted write and delayed
request FIFO (1 each direction).
Host software interacts with the bridge through internal registers. These internal registers provide the standard PCI
status and control for both the primary and secondary buses. Many vendor-specific features that exist in the TI
extension register set are included in the bridge. The PCI configuration header of the bridge is only accessible from
the primary PCI interface.
The bridge provides internal arbitration for the nine possible secondary bus masters, and provides each with a
dedicated active low request/grant pair (REQ/GNT). The arbiter features a two-tier rotational scheme with the
PCI2050B bridge defaulting to the highest priority tier. The PCI2050B device also supports external arbitration.
Upon system power up, power-on self-test (POST) software configures the bridge according to the devices that exist
on subordinate buses, and enables performance-enhancing features of the PCI2050B bridge. In a typical system,
this is the only communication with the bridge internal register set.
3−1
3.1.1
Write Combining
The PCI2050B bridge supports write combining for upstream and downstream transactions. This feature combines
separate sequential memory write transactions into a single burst transaction. This feature can only be used if the
address of the next memory write transaction is the next sequential address after the address of the last double word
of the previous memory transaction. For example, if the current memory transaction ends at address X and next
memory transaction starts at address X+1, then the PCI2050B bridge combines both transactions into a single
transaction.
The write combining feature of the PCI2050B bridge is enabled by default on power on reset. It can also be disabled
by setting bit 0 of the TI diagnostics register at offset F0h to 1.
3.1.2
66-MHz Operation
The PCI2050B bridge supports two 32-bit PCI buses operating at a maximum frequency of 66 MHz. The 66-MHz
clocking requires three terminals: P_M66ENA, S_M66ENA, and CONFIG66. To enable 66-MHz operation, the
CONFIG66 terminal must be tied high on the board. This sets the 66-MHz capable bit in the primary and secondary
status register. The P_M66ENA and S_M66ENA must not be pulled high unless CONFIG66 is also high.
The P_M66ENA and S_M66ENA signals indicate whether the primary or secondary interfaces are working at
66 MHz. This information is needed to control the frequency of the secondary bus. Note that PCI Local Bus
Specification (Revision 2.2) restricts clock frequency changes above 33 MHz during reset only.
The following frequency combinations are supported on the primary and secondary buses in the PCI2050B device:
•
•
•
66-MHz primary bus, 66-MHz secondary bus
66-MHz primary bus, 33-MHz secondary bus
33-MHz primary bus, 33-MHz secondary bus
The PCI2050B bridge does not support 33-MHz primary/66-MHz secondary bus operation. If CONFIG66 is high and
P_M66ENA is low, then the PCI2050B bridge pulls down S_M66ENA to indicate that secondary bus is running at
33 MHz.
The PCI2050B bridge generates the clock signals S_CLKOUT[9:0] for the secondary bus devices and its own
interface. It divides the P_CLK by 2 to generate the secondary clock outputs whenever the primary bus is running
at 66 MHz and secondary bus is running at 33 MHz. The bridge detects this condition by polling P_M66ENA and
S_M66ENA.
3.2 PCI Commands
The bridge responds to PCI bus cycles as a PCI target device based on internal register settings and on the decoding
of each address phase. Table 3−1 lists the valid PCI bus cycles and their encoding on the command/byte enable
(C/BE) bus during the address phase of a bus cycle.
3−2
Table 3−1. PCI Command Definitions
C/BE3−C/BE0
COMMAND
0000
Interrupt acknowledge
0001
Special cycle
0010
I/O read
0011
I/O write
0100
Reserved
0101
Reserved
0110
Memory read
0111
Memory write
1000
Reserved
1001
Reserved
1010
Configuration read
1011
Configuration write
1100
Memory read multiple
1101
Dual address cycle
1110
Memory read line
1111
Memory write and invalidate
The bridge never responds as a PCI target to the interrupt acknowledge, special cycle, or reserved commands. The
bridge does, however, initiate special cycles on both interfaces when a type 1 configuration cycle issues the special
cycle request. The remaining PCI commands address either memory, I/O, or configuration space. The bridge accepts
PCI cycles by asserting DEVSEL as a medium-speed device, i.e., DEVSEL is asserted two clock cycles after the
address phase.
The PCI2050B bridge converts memory write and invalidate commands to memory write commands when forwarding
transactions from either the primary or secondary side of the bridge if the bridge cannot guarantee that an entire cache
line will be delivered.
3.3 Configuration Cycles
PCI Local Bus Specification defines two types of PCI configuration read and write cycles: type 0 and type 1. The
bridge decodes each type differently. Type 0 configuration cycles are intended for devices on the primary bus, while
type 1 configuration cycles are intended for devices on some hierarchically subordinate bus. The difference between
these two types of cycles is the encoding of the primary PCI (P_AD) bus during the address phase of the cycle.
Figure 3−2 shows the P_AD bus encoding during the address phase of a type 0 configuration cycle. The 6-bit register
number field represents an 8-bit address with the two lower bits masked to 0, indicating a doubleword boundary. This
results in a 256-byte configuration address space per function per device. Individual byte accesses may be selected
within a doubleword by using the P_C/BE signals during the data phase of the cycle.
31
11
Reserved
10
8
Function
Number
7
2
Register
Number
1
0
0
0
Figure 3−2. PCI AD31−AD0 During Address Phase of a Type 0 Configuration Cycle
The bridge claims only type 0 configuration cycles when its P_IDSEL terminal is asserted during the address phase
of the cycle and the PCI function number encoded in the cycle is 0. If the function number is 1 or greater, then the
bridge does not recognize the configuration command. In this case, the bridge does not assert P_DEVSEL, and the
configuration transaction results in a master abort. The bridge services valid type 0 configuration read or write cycles
by accessing internal registers from the bridge configuration header (see Table 4−1).
3−3
Because type 1 configuration cycles are issued to devices on subordinate buses, the bridge claims type 1 cycles
based on the bus number of the destination bus. The P_AD bus encoding during the address phase of a type 1 cycle
is shown in Figure 3−3. The device number and bus number fields define the destination bus and device for the cycle.
31
24
23
16
Reserved
15
11
Device
Number
Bus Number
10
8
7
Function
Number
2
Register
Number
1
0
0
1
Figure 3−3. PCI AD31−AD0 During Address Phase of a Type 1 Configuration Cycle
Several bridge configuration registers shown in Table 4−1 are significant when decoding and claiming type 1
configuration cycles. The destination bus number encoded on the P_AD bus is compared to the values programmed
in the bridge configuration registers 18h, 19h, and 1Ah, which are the primary bus number, secondary bus number,
and subordinate bus number registers, respectively. These registers default to 00h and are programmed by host
software to reflect the bus hierarchy in the system (see Figure 3−4 for an example of a system bus hierarchy and how
the PCI2050B bus number registers would be programmed in this case).
PCI Bus 0
PCI2050B
Primary Bus
Secondary Bus
Subordinate Bus
PCI2050B
00h
01h
02h
Primary Bus
Secondary Bus
Subordinate Bus
PCI Bus 1
00h
03h
03h
PCI Bus 3
PCI2050B
Primary Bus
Secondary Bus
Subordinate Bus
01h
02h
02h
PCI Bus 2
Figure 3−4. Bus Hierarchy and Numbering
When the PCI2050B bridge claims a type 1 configuration cycle that has a bus number equal to its secondary bus
number, the PCI2050B bridge converts the type 1 configuration cycle to a type 0 configuration cycle and asserts the
proper S_AD line as the IDSEL (see Table 3−2). All other type 1 transactions that access a bus number greater than
the bridge secondary bus number but less than or equal to its subordinate bus number are forwarded as type 1
configuration cycles.
3−4
Table 3−2. PCI S_AD31−S_AD16 During the Address
Phase of a Type 0 Configuration Cycle
DEVICE
NUMBER
SECONDARY IDSEL
S_AD31−S_AD16
S_AD
ASSERTED
0h
0000 0000 0000 0001
16
1h
0000 0000 0000 0010
17
2h
0000 0000 0000 0100
18
3h
0000 0000 0000 1000
19
4h
0000 0000 0001 0000
20
5h
0000 0000 0010 0000
21
6h
0000 0000 0100 0000
22
7h
0000 0000 1000 0000
23
8h
0000 0001 0000 0000
24
9h
0000 0010 0000 0000
25
Ah
0000 0100 0000 0000
26
Bh
0000 1000 0000 0000
27
Ch
0001 0000 0000 0000
28
Dh
0010 0000 0000 0000
29
Eh
0100 0000 0000 0000
30
Fh
1000 0000 0000 0000
31
10h−1Eh
0000 0000 0000 0000
−
3.4 Special Cycle Generation
The bridge is designed to generate special cycles on both buses through a type 1 cycle conversion. During a type 1
configuration cycle, if the bus number field matches the bridge secondary bus number, the device number field is 1Fh,
and the function number field is 07h, then the bridge generates a special cycle on the secondary bus with a message
that matches the type 1 configuration cycle data. If the bus number is a subordinate bus and not the secondary, then
the bridge passes the type 1 special cycle request through to the secondary interface along with the proper message.
Special cycles are never passed through the bridge. Type 1 configuration cycles with a special cycle request can
propagate in both directions.
3.5 Secondary Clocks
The PCI2050B bridge provides 10 secondary clock outputs (S_CLKOUT[0:9]). Nine are provided for clocking
secondary devices. The tenth clock must be routed back into the PCI2050B S_CLK input to ensure all secondary bus
devices see the same clock. Figure 3−5 is a block diagram of the secondary clock function.
3−5
PCI2050B
S_CLK
S_CLKOUT9
S_CLKOUT8
PCI
Device
S_CLKOUT2
PCI
Device
S_CLKOUT1
PCI
Device
S_CLKOUT0
PCI
Device
Figure 3−5. Secondary Clock Block Diagram
3.6 Bus Arbitration
The PCI2050B bridge implements bus request (P_REQ) and bus grant (P_GNT) terminals for primary PCI bus
arbitration. Nine secondary bus requests and nine secondary bus grants are provided on the secondary of the
PCI2050B bridge. Ten potential initiators, including the bridge, can be located on the secondary bus. The PCI2050B
bridge provides a two-tier arbitration scheme on the secondary bus for priority bus-master handling.
The two-tier arbitration scheme improves performance in systems in which master devices do not all require the same
bandwidth. Any master that requires frequent use of the bus can be programmed to be in the higher priority tier.
3.6.1
Primary Bus Arbitration
The PCI2050B bridge, acting as an initiator on the primary bus, asserts P_REQ when forwarding transactions
upstream to the primary bus. If a target disconnect, a target retry, or a target abort is received in response to a
transaction initiated on the primary bus by the PCI2050B bridge, then the device deasserts P_REQ for two PCI clock
cycles.
When the primary bus arbiter asserts P_GNT in response to a P_REQ from the PCI2050B bridge, the device initiates
a transaction on the primary bus during the next PCI clock cycle after the primary bus is sampled idle.
When P_REQ is not asserted and the primary bus arbiter asserts P_GNT to the PCI2050B bridge, the device
responds by parking the P_AD31−P_AD0 bus, the C/BE3−C/BE0 bus, and primary parity (P_PAR) by driving them
to valid logic levels. If the PCI2050B bridge is parking the primary bus and wants to initiate a transaction on the bus,
then it can start the transaction on the next PCI clock by asserting the primary cycle frame (P_FRAME) while P_GNT
is still asserted. If P_GNT is deasserted, then the bridge must rearbitrate for the bus to initiate a transaction.
3.6.2
Internal Secondary Bus Arbitration
S_CFN controls the state of the secondary internal arbiter. The internal arbiter can be enabled by pulling S_CFN low
or disabled by pulling S_CFN high. The PCI2050B bridge provides nine secondary bus request terminals and nine
3−6
secondary bus grant terminals. Including the bridge, there are a total of ten potential secondary bus masters. These
request and grant signals are connected to the internal arbiter. When an external arbiter is implemented,
S_REQ8−S_REQ1 and S_GNT8−S_GNT1 are placed in a high-impedance mode.
3.6.3
External Secondary Bus Arbitration
An external secondary bus arbiter can be used instead of the PCI2050B internal bus arbiter. When using an external
arbiter, the PCI2050B internal arbiter must be disabled by pulling S_CFN high.
When an external secondary bus arbiter is used, the PCI2050B bridge internally reconfigures the S_REQ0 and
S_GNT0 signals so that S_REQ0 becomes the secondary bus grant for the bridge and S_GNT0 becomes the
secondary bus request for the bridge. This is done because S_REQ0 is an input and can thus provide the grant input
to the bridge, and S_GNT0 is an output and can thus provide the request output from the bridge.
When an external arbiter is used, all unused secondary bus grant outputs (S_GNT8−S_GNT1) are placed in a high
impedance mode. Any unused secondary bus request inputs (S_REQ8−S_REQ1) must be pulled high to prevent
the inputs from oscillating.
3.7 Decode Options
The PCI2050B bridge supports positive decoding on the primary interface and negative decoding on the secondary
interface. Positive decoding is a method of address decoding in which a device responds only to accesses within an
assigned address range. Negative decoding is a method of address decoding in which a device responds only to
accesses outside of an assigned address range.
3.8 System Error Handling
The PCI2050B bridge can be configured to signal a system error (SERR) for a variety of conditions. The P_SERR
event disable register (offset 64h, see Section 5.4) and the P_SERR status register (offset 6Ah, see Section 5.9)
provide control and status bits for each condition for which the bridge can signal SERR. These individual bits enable
SERR reporting for both downstream and upstream transactions.
By default, the PCI2050B bridge will not signal SERR. If the PCI2050B bridge is configured to signal SERR by setting
bit 8 in the command register (offset 04h, see Section 4.3), then the bridge signals SERR if any of the error conditions
in the P_SERR event disable register occur and that condition is enabled. By default, all error conditions are enabled
in the P_SERR event disable register. When the bridge signals SERR, bit 14 in the secondary status register (offset
1Eh, see Section 4.19) is set.
3.8.1
Posted Write Parity Error
If bit 1 in the P_SERR event disable register (offset 64h, see Section 5.4) is 0, then parity errors on the target bus
during a posted write are passed to the initiating bus as a SERR. When this occurs, bit 1 of the P_SERR status register
(offset 6Ah, see Section 5.9) is set. The status bit is cleared by writing a 1.
3.8.2
Posted Write Time-Out
If bit 2 in the P_SERR event disable register (offset 64h, see Section 5.4) is 0 and the retry timer expires while
attempting to complete a posted write, then the PCI2050B bridge signals SERR on the initiating bus. When this
occurs, bit 2 of the P_SERR status register (offset 6Ah, see Section 5.9) is set. The status bit is cleared by writing
a 1.
3.8.3
Target Abort on Posted Writes
If bit 3 in the P_SERR event disable register (offset 64h, see Section 5.4) is 0 and the bridge receives a target abort
during a posted write transaction, then the PCI2050B bridge signals SERR on the initiating bus. When this occurs,
bit 3 of the P_SERR status register (offset 6Ah, see Section 5.9) is set. The status bit is cleared by writing a 1.
3−7
3.8.4
Master Abort on Posted Writes
If bit 4 in the P_SERR event disable register (PCI offset 64h, see Section 5.4) is 0 and a posted write transaction
results in a master abort, then the PCI2050B bridge signals SERR on the initiating bus. When this occurs, bit 4 of
the P_SERR status register (PCI offset 6Ah, see Section 5.9) is set. The status bit is cleared by writing a 1.
3.8.5
Master Delayed Write Time-Out
If bit 5 in the P_SERR event disable register (PCI offset 64h, see Section 5.4) is 0 and the retry timer expires while
attempting to complete a delayed write, then the PCI2050B bridge signals SERR on the initiating bus. When this
occurs, bit 5 of the P_SERR status register (PCI offset 6Ah, see Section 5.9) is set. The status bit is cleared by writing
a 1.
3.8.6
Master Delayed Read Time-Out
If bit 6 in the P_SERR event disable register (offset 64h, see Section 5.4) is 0 and the retry timer expires while
attempting to complete a delayed read, then the PCI2050B bridge signals SERR on the initiating bus. When this
occurs, bit 6 of the P_SERR status register (offset 6Ah, see Section 5.9) is set. The status bit is cleared by writing
a 1.
3.8.7
Secondary SERR
The PCI2050B bridge passes SERR from the secondary bus to the primary bus if it is enabled for SERR response,
that is, if bit 8 in the command register (PCI offset 04h, see Section 4.3) is set, and if bit 1 in the bridge control register
(PCI offset 3Eh, see Section 4.32) is set.
3.9 Parity Handling and Parity Error Reporting
When forwarding transactions, the PCI2050B bridge attempts to pass the data parity condition from one interface
to the other unchanged, whenever possible, to allow the master and target devices to handle the error condition.
3.9.1
Address Parity Error
If the parity error response bit (bit 6) in the command register (PCI offset 04h, see Section 4.3) is set, then the
PCI2050B bridge signals SERR on address parity errors and target abort transactions.
3.9.2
Data Parity Error
If the parity error response bit (bit 6) in the command register (PCI offset 04h, see Section 4.3) is set, then the
PCI2050B bridge signals PERR when it receives bad data. When the bridge detects bad parity, bit 15 (detected parity
error) in the status register (PCI offset 06h, see Section 4.4) is set.
If the bridge is configured to respond to parity errors via bit 6 in the command register (PCI offset 04h, see Section 4.3),
then bit 8 (data parity error detected) in the status register (PCI offset 06h, see Section 4.4) is set when the bridge
detects bad parity. The data parity error detected bit is also set when the bridge, as a bus master, asserts PERR or
detects PERR.
3.10 Master and Target Abort Handling
If the PCI2050B bridge receives a target abort during a write burst, then it signals target abort back on the initiator
bus. If it receives a target abort during a read burst, then it provides all of the valid data on the initiator bus and
disconnects. Target aborts for posted and nonposted transactions are reported as specified in the PCI-to-PCI Bridge
Specification.
Master aborts for posted and nonposted transactions are reported as specified in the PCI-to-PCI Bridge Specification.
If a transaction is attempted on the primary bus after a secondary reset is asserted, then the PCI2050B bridge follows
bit 5 (master abort mode) in the bridge control register (PCI offset 3Eh, see Section 4.32) for reporting errors.
3−8
3.11 Discard Timer
The PCI2050B bridge is free to discard the data or status of a delayed transaction that was completed with a delayed
transaction termination when a bus master has not repeated the request within 210 or 215 PCI clocks (approximately
30 μs and 993 μs, respectively). The PCI Local Bus Specification recommends that a bridge wait 215 PCI clocks
before discarding the transaction data or status.
The PCI2050B bridge implements a discard timer for use in delayed transactions. After a delayed transaction is
completed on the destination bus, the bridge may discard it under two conditions. The first condition occurs when
a read transaction is made to a region of memory that is inside a defined prefetchable memory region, or when the
command is a memory read line or a memory read multiple, implying that the memory region is prefetchable. The
other condition occurs when the master originating the transaction (either a read or a write, prefetchable or
nonprefetchable) has not retried the transaction within 210 or 215 clocks. The number of clocks is tracked by a timer
referred to as the discard timer. When the discard timer expires, the bridge is required to discard the data. The
PCI2050B default value for the discard timer is 215 clocks; however, this value can be set to 210 clocks by setting bit
9 in the bridge control register (offset 3Eh, see Section 4.32). For more information on the discard timer, see error
conditions in the PCI Local Bus Specification.
3.12 Delayed Transactions
The bridge supports delayed transactions as defined in PCI Local Bus Specification. A target must be able to complete
the initial data phase in 16 PCI clocks or less from the assertion of the cycle frame (FRAME), and subsequent data
phases must complete in eight PCI clocks or less. A delayed transaction consists of three phases:
•
An initiator device issues a request.
•
The target completes the request on the destination bus and signals the completion to the initiator.
•
The initiator completes the request on the originating bus.
If the bridge is the target of a PCI transaction and it must access a slow device to write or read the requested data,
and the transaction takes longer than 16 clocks, then the bridge must latch the address, the command, and the byte
enables, and then issue a retry to the initiator. The initiator must end the transaction without any transfer of data and
is required to retry the transaction later using the same address, command, and byte enables. This is the first phase
of the delayed transaction.
During the second phase, if the transaction is a read cycle, the bridge fetches the requested data on the destination
bus, stores it internally, and obtains the completion status, thus completing the transaction on the destination bus.
If it is a write transaction, then the bridge writes the data and obtains the completion status, thus completing the
transaction on the destination bus. The bridge stores the completion status until the master on the initiating bus retries
the initial request.
During the third phase, the initiator rearbitrates for the bus. When the bridge sees the initiator retry the transaction,
it compares the second request to the first request. If the address, command, and byte enables match the values
latched in the first request, then the completion status (and data if the request was a read) is transferred to the initiator.
At this point, the delayed transaction is complete. If the second request from the initiator does not match the first
request exactly, then the bridge issues another retry to the initiator.
The PCI supports up to three delayed transactions in each direction at any given time.
3.13 Mode Selection
Table 3−3 shows the mode selection via MS0 (PDV/PPM terminal 155, GHK/ZHK terminal E17) and MS1 (PDV/PPM
terminal 106, GHK/ZHK terminal T19).
3−9
Table 3−3. Configuration via MS0 and MS1
MS0
MS1
MODE
0
0
CompactPCI hot-swap friendly
PCI Bus Power Management Interface Specification (Revision 1.1)
HS_SWITCH/GPIO(3) functions as HS_SWITCH
0
1
CompactPCI hot-swap disabled
PCI Bus Power Management Interface Specification (Revision 1.1)
HS_SWITCH/GPIO(3) functions as GPIO(3)
1
X
Intel™ compatible
No cPCI hot swap
PCI Bus Power Management Interface Specification (Revision 1.0)
3.14 CompactPCI Hot-Swap Support
The PCI2050B bridge is hot-swap friendly silicon that supports all of the hot-swap capable features, contains support
for software control, and integrates circuitry required by the PICMG CompactPCI Hot-Swap Specification. To be
hot-swap capable, the PCI2050B bridge supports the following:
•
Compliance with PCI Local Bus Specification
•
Tolerance of VCC from early power
•
Asynchronous reset
•
Tolerance of precharge voltage
•
I/O buffers that meet modified V/I requirements
•
Limited I/O terminal voltage at precharge voltage
•
Hot-swap control and status programming via extended PCI capabilities linked list
•
Hot-swap terminals: HS_ENUM, HS_SWITCH, and HS_LED
cPCI hot-swap defines a process for installing and removing PCI boards without adversely affecting a running system.
The PCI2050B bridge provides this functionality such that it can be implemented on a board that can be removed
and inserted in a hot-swap system.
The PCI2050B bridge provides three terminals to support hot-swap when configured to be in hot-swap mode:
HS_ENUM (output), HS_SWITCH (input), and HS_LED (output). The HS_ENUM output indicates to the system that
an insertion event occurred or that a removal event is about to occur. The HS_SWITCH input indicates the state of
a board ejector handle, and the HS_LED output lights a blue LED to signal insertion- and removal-ready status.
3−10
3.15 JTAG Support
The PCI2050B bridge implements a JTAG test port based on IEEE Standard 1149.1, IEEE Standard Test Access Port
and Boundary-Scan Architecture. The JTAG test port consists of the following:
•
•
•
•
•
A 5-wire test access port
A test access port controller
An instruction register
A bypass register
A boundary-scan register
3.15.1 Test Port Instructions
The PCI2050B bridge supports the following JTAG instructions:
• EXTEST, BYPASS, and SAMPLE
• HIGHZ and CLAMP
• Private (various private instructions used by TI for test purposes)
Table 3−4 lists and describes the different test port instructions, and gives the op code of each one. The information
in Table 3−5 is for implementation of boundary scan interface signals to permit in-circuit testing.
Table 3−4. JTAG Instructions and Op Codes
INSTRUCTION
OP CODE
DESCRIPTION
EXTEST
00000
External test: drives terminals from the boundary scan register
SAMPLE
00001
Sample I/O terminals
CLAMP
00100
Drives terminals from the boundary scan register and selects the bypass register for shifts
HIGHZ
00101
Puts all outputs and I/O terminals except for the TDO terminal in a high-impedance state
BYPASS
11111
Selects the bypass register for shifts
Table 3−5. Boundary Scan Terminal Order
BOUNDARY SCAN
REGISTER NUMBER
PDV/PPM TERMINAL
NUMBER
GHK/ZHK
TERMINAL NUMBER
TERMINAL
NAME
GROUP DISABLE
REGISTER
BOUNDARY-SCAN
CELL TYPE
0
1
137
J15
S_AD0
19
Bidirectional
138
H19
S_AD1
19
Bidirectional
2
140
H17
S_AD2
19
Bidirectional
3
141
H14
S_AD3
19
Bidirectional
4
143
G19
S_AD4
19
Bidirectional
5
144
G18
S_AD5
19
Bidirectional
6
146
G14
S_AD6
19
Bidirectional
7
147
F19
S_AD7
19
Bidirectional
8
149
G15
S_C/BE0
19
Bidirectional
9
150
F17
S_AD8
19
Bidirectional
10
152
F14
S_AD9
19
Bidirectional
11
153
E18
S_M66ENA
19
Bidirectional
12
154
F15
S_AD10
19
Bidirectional
13
155
E17
MS0
−
Input
14
158
E14
S_AD11
19
Bidirectional
15
161
B15
S_AD12
19
Bidirectional
16
162
A15
S_AD13
19
Bidirectional
17
164
B14
S_AD14
19
Bidirectional
18
165
E13
S_AD15
19
Bidirectional
19
−
−
−
−
Control
3−11
Table 3−5. Boundary Scan Terminal Order (Continued)
BOUNDARY SCAN
REGISTER NUMBER
PDV/PPM TERMINAL
NUMBER
GHK/ZHK
TERMINAL NUMBER
TERMINAL
NAME
GROUP DISABLE
REGISTER
BOUNDARY-SCAN
CELL TYPE
20
167
F12
S_C/BE1
19
Bidirectional
21
168
C13
S_PAR
19
Bidirectional
22
169
B13
S_SERR
−
Input
23
171
E12
S_PERR
26
Bidirectional
24
172
C12
S_LOCK
26
Bidirectional
25
173
B12
S_STOP
26
Bidirectional
26
−
−
−
−
Control
27
175
A11
S_DEVSEL
26
Bidirectional
28
176
B11
S_TRDY
26
Bidirectional
29
177
C11
S_IRDY
26
Bidirectional
30
179
F11
S_FRAME
26
Bidirectional
31
180
A10
S_C/BE2
48
Bidirectional
32
182
E10
S_AD16
48
Bidirectional
33
183
F10
S_AD17
48
Bidirectional
34
185
C9
S_AD18
48
Bidirectional
35
186
F9
S_AD19
48
Bidirectional
36
188
A8
S_AD20
48
Bidirectional
37
189
B8
S_AD21
48
Bidirectional
38
191
F8
S_AD22
48
Bidirectional
39
192
E8
S_AD23
48
Bidirectional
40
194
B7
S_C/BE3
48
Bidirectional
41
195
C7
S_AD24
48
Bidirectional
42
197
A6
S_AD25
48
Bidirectional
43
198
B6
S_AD26
48
Bidirectional
44
200
C6
S_AD27
48
Bidirectional
45
201
A5
S_AD28
48
Bidirectional
46
203
B5
S_AD29
48
Bidirectional
47
204
E6
S_AD30
48
Bidirectional
48
−
−
−
−
Control
49
206
A4
S_AD31
48
Bidirectional
50
207
B4
S_REQ0
−
Input
51
2
E3
S_REQ1
−
Input
52
3
F5
S_REQ2
−
Input
53
4
G6
S_REQ3
−
Input
54
5
E2
S_REQ4
−
Input
55
6
E1
S_REQ5
−
Input
56
7
F3
S_REQ6
−
Input
57
8
F2
S_REQ7
−
Input
58
9
G5
S_REQ8
−
Input
59
10
F1
S_GNT0
61
Output
60
11
H6
S_GNT1
61
Output
61
−
−
−
−
Control
3−12
Table 3−5. Boundary Scan Terminal Order (Continued)
BOUNDARY SCAN
REGISTER NUMBER
PDV/PPM TERMINAL
NUMBER
GHK/ZHK
TERMINAL NUMBER
TERMINAL
NAME
GROUP DISABLE
REGISTER
BOUNDARY-SCAN
CELL TYPE
62
13
G2
S_GNT2
61
Output
63
14
G1
S_GNT3
61
Output
64
15
H5
S_GNT4
61
Output
65
16
H3
S_GNT5
61
Output
66
17
H2
S_GNT6
61
Output
67
18
H1
S_GNT7
61
Output
68
19
J1
S_GNT8
61
Output
69
21
J3
S_CLK
−
Input
70
22
J5
S_RST
78
Output
71
23
J6
S_CFN
−
Input
72
24
K1
GPIO3
78
Bidirectional
73
25
K2
GPIO2
78
Bidirectional
74
27
K5
GPIO1
78
Bidirectional
75
28
K6
GPIO0
78
Bidirectional
76
29
L1
S_CLKOUT0
−
Output
77
30
L2
S_CLKOUT1
−
Output
78
−
−
−
−
Output
79
32
L5
S_CLKOUT2
−
Output
80
33
M1
S_CLKOUT3
−
Output
81
35
M3
S_CLKOUT4
−
Output
82
36
M6
S_CLKOUT5
−
Output
83
38
N1
S_CLKOUT6
−
Output
84
39
N2
S_CLKOUT7
−
Output
85
41
N6
S_CLKOUT8
−
Output
86
42
P1
S_CLKOUT9
−
Output
87
43
P2
P_RST
−
Input
88
44
N5
BPCCE
−
Input
89
45
P3
P_CLK
−
Input
90
46
R1
P_GNT
−
Input
91
47
P6
P_REQ
92
Output
92
−
−
−
−
Control
93
49
R3
P_AD31
111
Bidirectional
94
50
T1
P_AD30
111
Bidirectional
95
55
R6
P_AD29
111
Bidirectional
96
57
W5
P_AD28
111
Bidirectional
97
58
U6
P_AD27
111
Bidirectional
98
60
R7
P_AD26
111
Bidirectional
99
61
W6
P_AD25
111
Bidirectional
100
63
U7
P_AD24
111
Bidirectional
101
64
V7
P_C/BE3
111
Bidirectional
102
65
W7
P_IDSEL
−
Input
103
67
U8
P_AD23
111
Bidirectional
104
68
V8
P_AD22
111
Bidirectional
3−13
Table 3−5. Boundary Scan Terminal Order (Continued)
BOUNDARY SCAN
REGISTER NUMBER
PDV/PPM TERMINAL
NUMBER
GHK/ZHK
TERMINAL NUMBER
TERMINAL
NAME
GROUP DISABLE
REGISTER
BOUNDARY-SCAN
CELL TYPE
105
70
W9
P_AD21
111
Bidirectional
106
71
V9
P_AD20
111
Bidirectional
107
73
R9
P_AD19
111
Bidirectional
108
74
P9
P_AD18
111
Bidirectional
109
76
V10
P_AD17
111
Bidirectional
110
77
U10
P_AD16
111
Bidirectional
3−14
111
−
−
−
−
Control
112
79
P10
P_C/BE2
111
Bidirectional
113
80
W11
P_FRAME
118
Bidirectional
114
82
U11
P_IRDY
118
Bidirectional
115
83
P11
P_TRDY
118
Bidirectional
116
84
R11
P_DEVSEL
118
Bidirectional
117
85
W12
P_STOP
118
Bidirectional
Control
118
−
−
−
−
119
87
P12
P_LOCK
118
Input
120
88
R12
P_PERR
118
Bidirectional
121
89
W13
P_SERR
142
Output
122
90
V13
P_PAR
142
Bidirectional
123
92
P13
P_C/BE1
142
Bidirectional
124
93
W14
P_AD15
142
Bidirectional
125
95
R13
P_AD14
142
Bidirectional
126
96
U14
P_AD13
142
Bidirectional
127
98
P14
P_AD12
142
Bidirectional
128
99
V15
P_AD11
142
Bidirectional
129
101
U15
P_AD10
142
Bidirectional
130
102
W16
P_M66ENA
−
Input
131
106
T19
MS1
−
Input
132
107
R17
P_AD9
142
Bidirectional
133
109
N14
P_AD8
142
Bidirectional
134
110
R18
P_C/BEO
142
Bidirectional
135
112
P17
P_AD7
142
Bidirectional
136
113
P18
P_AD6
142
Bidirectional
137
115
P19
P_AD5
142
Bidirectional
138
116
M14
P_AD4
142
Bidirectional
139
118
N18
P_AD3
142
Bidirectional
140
119
N19
P_AD2
142
Bidirectional
141
121
M17
P_AD1
142
Bidirectional
142
122
M18
P_AD0
142
Bidirectional
143
−
−
−
−
Control
144
125
L18
CONFIG66
−
Input
145
126
L17
MSK_IN
−
Input
146
−
−
−
−
Control
147
127
L15
HS_ENUM
144
Output
148
128
L14
HS_LED
144
Output
3.16 GPIO Interface
The PCI2050B bridge implements a four-terminal general-purpose I/O interface. Besides functioning as a
general-purpose I/O interface, the GPIO terminals can read in the secondary clock mask and stop the bridge from
accepting I/O and memory transactions.
3.16.1 Secondary Clock Mask
The PCI2050B bridge uses GPIO0, GPIO2, and MSK_IN to shift in the secondary clock mask from an external shift
register. A secondary clock mask timing diagram is shown in Figure 3−6. Table 3−6 lists the format for clock mask
data.
MSK_IN
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
GPIO2
GPIO0
P_RST
S_RST
Figure 3−6. Clock Mask Read Timing After Reset
Table 3−6. Clock Mask Data Format
BIT
CLOCK
[0:1]
S_CLKOUT0
[2:3]
S_CLKOUT1
[4:5]
S_CLKOUT2
[6:7]
S_CLKOUT3
8
S_CLKOUT4
9
S_CLKOUT5
10
S_CLKOUT6
11
S_CLKOUT7
12
S_CLKOUT8
13
S_CLKOUT9 (PCI2050B S_CLK input)
[14:15]
Reserved
3.16.2 Transaction Forwarding Control
The PCI2050B bridge will stop forwarding I/O and memory transactions if bit 5 of the chip control register (offset 40h,
see Section 5.1) is set to 1 and GPIO3 is driven high. The bridge completes all queued posted writes and delayed
requests, but delayed completions are not returned until GPIO3 is driven low and transaction forwarding is resumed.
The bridge continues to accept configuration cycles in this mode. This feature is not available when in CompactPCI
hot-swap mode because GPIO3 is used as the HS_SWITCH input in this mode.
3−15
3.17 PCI Power Management
The PCI Power Management Specification establishes the infrastructure required to let the operating system control
the power of PCI functions. This is done by defining a standard PCI interface and operations to manage the power
of PCI functions on the bus. The PCI bus and the PCI functions can be assigned one of four software visible power
management states, which result in varying levels of power savings.
The four power management states of PCI functions are D0—fully on state, D1 and D2—intermediate states, and
D3—off state. Similarly, bus power states of the PCI bus are B0−B3. The bus power states B0−B3 are derived from
the device power state of the originating PCI2050B device.
For the operating system to manage the device power states on the PCI bus, the PCI function supports four power
management operations:
•
•
•
•
Capabilities reporting
Power status reporting
Setting the power state
System wake-up
The operating system identifies the capabilities of the PCI function by traversing the new capabilities list. The
presence of the new capabilities list is indicated by bit 4 in the status register (offset 06h, see Section 4.4) which
provides access to the capabilities list.
3.17.1 Behavior in Low-Power States
The PCI2050B bridge supports D0, D1, D2, and D3hot power states when in TI mode. The PCI2050B bridge only
supports D0 and D3 power states when in Intel mode. The PCI2050B bridge is fully functional only in D0 state. In the
lower power states, the bridge does not accept any memory or I/O transactions. These transactions are aborted by
the master. The bridge accepts type 0 configuration cycles in all power states except D3cold. The bridge also accepts
type 1 configuration cycles but does not pass these cycles to the secondary bus in any of the lower power states.
Type 1 configuration writes are discarded and reads return all 1s. All error reporting is done in the low power states.
When in D2 and D3hot states, the bridge turns off all secondary clocks for further power savings.
When going from D3hot to D0, an internal reset is generated. This reset initializes all PCI configuration registers to
their default values. The TI specific registers (40h − FFh) are not reset. Power management registers also are not
reset.
3−16
4 Bridge Configuration Header
The PCI2050B bridge is a single-function PCI device. The configuration header is in compliance with the PCI-to-PCI
Bridge Specification (Revision 1.1). Table 4−1 shows the PCI configuration header, which includes the predefined
portion of the bridge configuration space. The PCI configuration offset is shown in the right column under the OFFSET
heading.
Table 4−1. Bridge Configuration Header
REGISTER NAME
OFFSET
Device ID
Vendor ID
Status
00h
Command
04h
Class code
BIST
Header type
Secondary bus latency timer
Primary latency timer
Revision ID
08h
Cache line size
0Ch
Base address 0
10h
Base address 1
14h
Subordinate bus number
Secondary bus number
Primary bus number
18h
I/O limit
I/O base
1Ch
Secondary status
Memory limit
Prefetchable memory limit
Memory base
20h
Prefetchable memory base
24h
Prefetchable base upper 32 bits
28h
Prefetchable limit upper 32 bits
I/O limit upper 16 bits
2Ch
I/O base upper 16 bits
Reserved
30h
Capability pointer
34h
Expansion ROM base address
38h
Bridge control
Interrupt pin
Interrupt line
3Ch
Arbiter control
Extended diagnostic
Chip control
40h
Reserved
GPIO input data
GPIO output enable
Reserved
P_SERR status
44h−60h
GPIO output data
P_SERR event disable
Secondary clock control
Reserved
Power management capabilities
Data
PMCSR bridge support
Reserved
Hot swap control status
PM capability ID
Power management control/status
HS next item pointer
HS capability ID
Reserved
DCh
E0h
E4h
E8h−ECh
Diagnostics
Reserved
68h
6Ch−D8h
PM next item pointer
Reserved
64h
F0h
F4h−FFh
4−1
4.1 Vendor ID Register
This 16-bit value is allocated by the PCI Special Interest Group (SIG) and identifies TI as the manufacturer of this
device. The vendor ID assigned to TI is 104Ch.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Vendor ID
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
1
0
0
0
0
0
1
0
0
1
1
0
0
Register:
Type:
Offset:
Default:
Vendor ID
Read-only
00h
104Ch
4.2 Device ID Register
This 16-bit value is allocated by the vendor and identifies the PCI device. The device ID for the PCI2050B bridge is
AC28h.
Bit
15
14
13
12
11
10
9
Type
R
R
R
R
R
R
R
R
Default
1
0
1
0
1
1
0
0
7
6
5
4
3
2
1
0
R
R
R
R
R
R
R
R
0
0
1
0
1
0
0
0
Device ID
Name
Register:
Type:
Offset:
Default:
4−2
8
Device ID
Read-only
02h
AC28h
4.3 Command Register
The command register provides control over the bridge interface to the primary PCI bus. VGA palette snooping is
enabled through this register, and all other bits adhere to the definitions in the PCI Local Bus Specification. Table 4−2
describes the bit functions in the command register.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Command
Name
Type
R
R
R
R
R
R
R/W
R/W
R
R/W
R/W
R
R
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Command
Read-only, Read/Write
04h
0000h
Table 4−2. Command Register Description
BIT
TYPE
FUNCTION
15−10
R
9
R/W
Fast back-to-back enable. This bit defaults to 0.
8
R/W
System error (SERR) enable. Bit 8 controls the enable for the SERR driver on the primary interface.
0 = Disable SERR driver on primary interface (default)
1 = Enable the SERR driver on primary interface
7
R
6
R/W
Parity error response enable. Bit 6 controls the bridge response to parity errors.
0 = Parity error response disabled (default)
1 = Parity error response enabled
5
R/W
VGA palette snoop enable. When set, the bridge passes I/O writes on the primary PCI bus with addresses 3C6h, 3C8h,
and 3C9h inclusive of ISA aliases (that is, only bits AD9−AD0 are included in the decode).
4
R
Memory write and invalidate enable. In a PCI-to-PCI bridge, bit 4 must be read-only and return 0 when read.
3
R
Special cycle enable. A PCI-to-PCI bridge cannot respond as a target to special cycle transactions, so bit 3 is defined as
read-only and must return 0 when read.
R/W
Bus master enable. Bit 2 controls the ability of the bridge to initiate a cycle on the primary PCI bus. When bit 2 is 0, the bridge
does not respond to any memory or I/O transactions on the secondary interface since they cannot be forwarded to the
primary PCI bus.
0 = Bus master capability disabled (default)
1 = Bus master capability enabled
R/W
Memory space enable. Bit 1 controls the bridge response to memory accesses for both prefetchable and nonprefetchable
memory spaces on the primary PCI bus. Only when bit 1 is set will the bridge forward memory accesses to the secondary
bus from a primary bus initiator.
0 = Memory space disabled (default)
1 = Memory space enabled
R/W
I/O space enable. Bit 0 controls the bridge response to I/O accesses on the primary interface. Only when bit 0 is set will
the bridge forward I/O accesses to the secondary bus from a primary bus initiator.
0 = I/O space disabled (default)
1 = I/O space enabled
2
1
0
Reserved
Wait cycle control. Bit 7 controls address/data stepping by the bridge on both interfaces. The bridge does not support
address/data stepping and this bit is hardwired to 0.
4−3
4.4 Status Register
The status register provides device information to the host system. Bits in this register are cleared by writing a 1 to
the respective bit; writing a 0 to a bit location has no effect. Table 4−3 describes the status register.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R
R
R/W
0
0
0
0
0
0
1
R
R
R
R
R
R
R
R
0
1
0
0
1
0
0
0
0
Status
Name
Type
Default
Register:
Type:
Offset:
Default:
Status
Read-only, Read/Write
06h
0290h
Table 4−3. Status Register Description
BIT
TYPE
15
R/W
Detected parity error. Bit 15 is set when a parity error is detected.
14
R/W
Signaled system error (SERR). Bit 14 is set if SERR is enabled in the command register (offset 04h, see Section 4.3) and
the bridge signals a system error (SERR). See Section 3.8, System Error Handling.
0 = No SERR signaled (default)
1 = Signals SERR
13
R/W
Received master abort. Bit 13 is set when a cycle initiated by the bridge on the primary bus has been terminated by a master
abort.
0 = No master abort received (default)
1 = Master abort received
12
R/W
Received target abort. Bit 12 is set when a cycle initiated by the bridge on the primary bus has been terminated by a target
abort.
0 = No target abort received (default)
1 = Target abort received
11
R/W
Signaled target abort. Bit 11 is set by the bridge when it terminates a transaction on the primary bus with a target abort.
0 = No target abort signaled by the bridge (default)
1 = Target abort signaled by the bridge
10−9
R
DEVSEL timing. These read-only bits encode the timing of P_DEVSEL and are hardwired 01b, indicating that the bridge
asserts this signal at a medium speed.
4−4
FUNCTION
Data parity error detected. Bit 8 is encoded as:
0 = The conditions for setting this bit have not been met. No parity error detected. (default)
1 = A data parity error occurred and the following conditions were met:
a. P_PERR was asserted by any PCI device including the bridge.
b. The bridge was the bus master during the data parity error.
c. The parity error response bit (bit 6) was set in the command register (offset 04h, see Section 4.3).
8
R/W
7
R
Fast back-to-back capable. The bridge supports fast back-to-back transactions as a target; therefore, bit 7 is hardwired to
1.
6
R
User-definable feature (UDF) support. The PCI2050B bridge does not support the user-definable features; therefore, bit
6 is hardwired to 0.
5
R
66-MHz capable. Bit 5 indicates whether the primary interface is 66-MHz capable. It reads as 0 when CONFIG66 is tied
low to indicate that the PCI2050B bridge is not 66 MHz capable and reads as 1 when CONFIG66 is tied high to indicate
that the primary bus is 66 MHz capable.
4
R
Capabilities list. Bit 4 is read-only and is hardwired to 1, indicating that capabilities additional to standard PCI are
implemented. The linked list of PCI power management capabilities is implemented by this function.
3−0
R
Reserved. Bits 3−0 return 0s when read.
4.5 Revision ID Register
The revision ID register indicates the silicon revision of the PCI2050B bridge.
Bit
7
6
5
4
3
2
1
0
Revision ID
Name
Type
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
1
0
Register:
Type:
Offset:
Default:
Revision ID
Read-only
08h
02h (reflects the current revision of the silicon)
4.6 Class Code Register
This register categorizes the PCI2050B bridge as a PCI-to-PCI bridge device (0604h) with a 00h programming
interface.
Bit
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Class code
Name
Base class
Sub class
Programming interface
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
1
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Class code
Read-only
09h
06 0400h
4.7 Cache Line Size Register
The cache line size register is programmed by host software to indicate the system cache line size needed by the
bridge for memory read line, memory read multiple, and memory write and invalidate transactions. The PCI2050B
bridge supports cache line sizes up to and including 16 doublewords for memory write and invalidate. If the cache
line size is larger than 16 doublewords, the command is converted to a memory write command.
Bit
7
6
5
4
3
2
1
0
Cache line size
Name
Type
Default
Register:
Type:
Offset:
Default:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Cache line size
Read/Write
0Ch
00h
4−5
4.8 Primary Latency Timer Register
The latency timer register specifies the latency timer for the bridge in units of PCI clock cycles. When the bridge is
a primary PCI bus initiator and asserts P_FRAME, the latency timer begins counting from 0. If the latency timer expires
before the bridge transaction has terminated, then the bridge terminates the transaction when its P_GNT is
deasserted.
Bit
7
6
5
4
3
2
1
0
Latency timer
Name
Type
Default
Register:
Type:
Offset:
Default:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Latency timer
Read/Write
0Dh
00h
4.9 Header Type Register
The header type register is read-only and returns 01h when read, indicating that the PCI2050B configuration space
adheres to the PCI-to-PCI bridge configuration. Only the layout for bytes 10h−3Fh of configuration space is
considered.
Bit
7
6
5
4
3
2
1
0
Type
R
R
R
R
Default
0
0
0
R
R
R
R
0
0
0
0
1
Header type
Name
Register:
Type:
Offset:
Default:
Header type
Read-only
0Eh
01h
4.10 BIST Register
The PCI2050B bridge does not support built-in self test (BIST). The BIST register is read-only and returns the value
00h when read.
Bit
7
6
5
4
3
2
1
0
BIST
Name
Type
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
4−6
BIST
Read-only
0Fh
00h
4.11 Base Address Register 0
The bridge requires no additional resources. Base address register 0 is read-only and returns 0s when read.
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Base address register 0
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Base address register 0
Name
Register:
Type:
Offset:
Default:
Base address register 0
Read-only
10h
0000 0000h
4.12 Base Address Register 1
The bridge requires no additional resources. Base address register 1 is read-only and returns 0s when read.
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Base address register 1
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Base address register 1
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Base address register 1
Read-only
14h
0000 0000h
4.13 Primary Bus Number Register
The primary bus number register indicates the primary bus number to which the bridge is connected. The bridge uses
this register, in conjunction with the secondary bus number and subordinate bus number registers, to determine when
to forward PCI configuration cycles to the secondary buses.
Bit
7
6
5
4
3
2
1
0
Primary bus number
Name
Type
Default
Register:
Type:
Offset:
Default:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Primary bus number
Read/Write
18h
00h
4−7
4.14 Secondary Bus Number Register
The secondary bus number register indicates the secondary bus number to which the bridge is connected. The
PCI2050B bridge uses this register, in conjunction with the primary bus number and subordinate bus number
registers, to determine when to forward PCI configuration cycles to the secondary buses. Configuration cycles
directed to the secondary bus are converted to type 0 configuration cycles.
Bit
7
6
5
4
R/W
R/W
R/W
R/W
0
0
0
0
3
2
1
0
R/W
R/W
R/W
R/W
0
0
0
0
Secondary bus number
Name
Type
Default
Register:
Type:
Offset:
Default:
Secondary bus number
Read/Write
19h
00h
4.15 Subordinate Bus Number Register
The subordinate bus number register indicates the bus number of the highest numbered bus beyond the primary bus
existing behind the bridge. The PCI2050B bridge uses this register, in conjunction with the primary bus number and
secondary bus number registers, to determine when to forward PCI configuration cycles to the subordinate buses.
Configuration cycles directed to a subordinate bus (not the secondary bus) remain type 1 cycles as the cycle crosses
the bridge.
Bit
7
6
5
4
R/W
R/W
R/W
R/W
0
0
0
0
3
2
1
0
R/W
R/W
R/W
R/W
0
0
0
0
Subordinate bus number
Name
Type
Default
Register:
Type:
Offset:
Default:
Subordinate bus number
Read/write
1Ah
00h
4.16 Secondary Bus Latency Timer Register
The secondary bus latency timer specifies the latency time for the bridge in units of PCI clock cycles. When the bridge
is a secondary PCI bus initiator and asserts S_FRAME, the latency timer begins counting from 0. If the latency timer
expires before the bridge transaction has terminated, then the bridge terminates the transaction when its S_GNT is
deasserted. The PCI-to-PCI bridge S_GNT is an internal signal and is removed when another secondary bus master
arbitrates for the bus.
Bit
7
6
5
R/W
R/W
R/W
R/W
0
0
0
0
3
2
1
0
R/W
R/W
R/W
R/W
0
0
0
0
Secondary bus latency timer
Name
Type
Default
Register:
Type:
Offset:
Default:
4−8
4
Secondary bus latency timer
Read/Write
1Bh
00h
4.17 I/O Base Register
The I/O base register is used in decoding I/O addresses to pass through the bridge. The bridge supports 32-bit I/O
addressing; thus, bits 3−0 are read-only and default to 0001b. The upper four bits are writable and correspond to
address bits AD15−AD12. The lower 12 address bits of the I/O base address are considered 0. Thus, the bottom of
the defined I/O address range is aligned on a 4K-byte boundary. The upper 16 address bits of the 32-bit I/O base
address corresponds to the contents of the I/O base upper 16 bits register (offset 30h, see Section 4.26).
Bit
7
6
5
4
3
2
1
0
I/O base
Name
Type
Default
Register:
Type:
Offset:
Default:
R/W
R/W
R/W
R/W
R
R
R
R
0
0
0
0
0
0
0
1
I/O base
Read-only, Read/Write
1Ch
01h
4.18 I/O Limit Register
The I/O limit register is used in decoding I/O addresses to pass through the bridge. The bridge supports 32-bit I/O
addressing; thus, bits 3−0 are read-only and default to 0001b. The upper four bits are writable and correspond to
address bits AD15−AD12. The lower 12 address bits of the I/O limit address are considered FFFh. Thus, the top of
the defined I/O address range is aligned on a 4K-byte boundary. The upper 16 address bits of the 32-bit I/O limit
address corresponds to the contents of the I/O limit upper 16 bits register (offset 32h, see Section 4.27).
Bit
7
6
5
4
3
2
1
0
I/O limit
Name
Type
Default
Register:
Type:
Offset:
Default:
R/W
R/W
R/W
R/W
R
R
R
R
0
0
0
0
0
0
0
1
I/O limit
Read-only, Read/Write
1Dh
01h
4−9
4.19 Secondary Status Register
The secondary status register is similar in function to the status register (offset 06h, see Section 4.4); however, its
bits reflect status conditions of the secondary interface. Bits in this register are cleared by writing a 1 to the respective
bit.
Bit
15
14
13
12
11
10
9
Type
Default
8
7
6
5
4
3
2
1
0
Secondary status
Name
R/W
R/W
R/W
R/W
R/W
R
R
R/W
R
R
R
R
R
R
R
R
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Secondary status
Read-only, Read/Write
1Eh
0280h
Table 4−4. Secondary Status Register Description
BIT
TYPE
15
R/W
Detected parity error. Bit 15 is set when a parity error is detected on the secondary interface.
0 = No parity error detected on the secondary bus (default)
1 = Parity error detected on the secondary bus
R/W
Received system error. Bit 14 is set when the secondary interface detects S_SERR asserted. Note that the bridge never
asserts S_SERR.
0 = No S_SERR detected on the secondary bus (default)
1 = S_SERR detected on the secondary bus
R/W
Received master abort. Bit 13 is set when a cycle initiated by the bridge on the secondary bus has been terminated by a
master abort.
0 = No master abort received (default)
1 = Bridge master aborted the cycle
12
R/W
Received target abort. Bit 12 is set when a cycle initiated by the bridge on the secondary bus has been terminated by a target
abort.
0 = No target abort received (default)
1 = Bridge received a target abort
11
R/W
Signaled target abort. Bit 11 is set by the bridge when it terminates a transaction on the secondary bus with a target abort.
0 = No target abort signaled (default)
1 = Bridge signaled a target abort
10−9
R
DEVSEL timing. These read-only bits encode the timing of S_DEVSEL and are hardwired to 01b, indicating that the bridge
asserts this signal at a medium speed.
14
13
4−10
FUNCTION
Data parity error detected.
0 = The conditions for setting this bit have not been met
1 = A data parity error occurred and the following conditions were met:
a. S_PERR was asserted by any PCI device including the bridge.
b. The bridge was the bus master during the data parity error.
c. The parity error response bit (bit 1) was set in the bridge control register (offset 3Eh, see Section 4.32).
8
R/W
7
R
Fast back-to-back capable. Bit 7 is hardwired to 1.
6
R
User-definable feature (UDF) support. Bit 6 is hardwired to 0.
5
R
66-MHz capable. Bit 5 is hardwired to 0.
4−0
R
Reserved. Bits 4−0 return 0s when read.
4.20 Memory Base Register
The memory base register defines the base address of a memory-mapped I/O address range used by the bridge to
determine when to forward memory transactions from one interface to the other. The upper 12 bits of this register
are read/write and correspond to the address bits AD31−AD20. The lower 20 address bits are considered 0s; thus,
the address range is aligned to a 1M-byte boundary. The bottom four bits are read-only and return 0s when read.
Bit
15
14
13
12
11
10
9
Type
Default
8
7
6
5
4
3
2
1
0
Memory base
Name
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Memory base
Read-only, Read/Write
20h
0000h
4.21 Memory Limit Register
The memory limit register defines the upper-limit address of a memory-mapped I/O address range used to determine
when to forward memory transactions from one interface to the other. The upper 12 bits of this register are read/write
and correspond to the address bits AD31−AD20. The lower 20 address bits are considered 1s; thus, the address
range is aligned to a 1M-byte boundary. The bottom four bits are read-only and return 0s when read.
Bit
15
14
13
12
11
10
9
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R
R
R
R
0
0
0
0
0
0
0
0
Memory limit
Name
Type
8
Register:
Type:
Offset:
Default:
Memory limit
Read-only, Read/Write
22h
0000h
4.22 Prefetchable Memory Base Register
The prefetchable memory base register defines the base address of a prefetchable memory address range used by
the bridge to determine when to forward memory transactions from one interface to the other. The upper 12 bits of
this register are read/write and correspond to the address bits AD31−AD20. The lower 20 address bits are considered
0; thus, the address range is aligned to a 1M-byte boundary. The bottom four bits are read-only and return 0s
when read.
Bit
15
14
13
12
11
10
9
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
7
R/W
R/W
0
0
0
0
0
0
0
0
0
6
5
4
3
2
1
0
R/W
R/W
R/W
R
R
R
R
0
0
0
0
0
0
0
Prefetchable memory base
Name
Type
8
Register:
Type:
Offset:
Default:
Prefetchable memory base
Read-only, Read/Write
24h
0000h
4−11
4.23 Prefetchable Memory Limit Register
The prefetchable memory limit register defines the upper-limit address of a prefetchable memory address range used
to determine when to forward memory transactions from one interface to the other. The upper 12 bits of this register
are read/write and correspond to the address bits AD31−AD20. The lower 20 address bits are considered 1s; thus,
the address range is aligned to a 1M-byte boundary. The bottom four bits are read-only and return 0s when read.
Bit
15
14
13
12
11
10
Type
Default
9
8
7
6
5
4
3
2
1
0
Prefetchable memory limit
Name
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Prefetchable memory limit
Read-only, Read/Write
26h
0000h
4.24 Prefetchable Base Upper 32 Bits Register
The prefetchable base upper 32 bits register plus the prefetchable memory base register defines the base address
of the 64-bit prefetchable memory address range used by the bridge to determine when to forward memory
transactions from one interface to the other. The prefetchable base upper 32 bits register must be programmed to
all zeros when 32-bit addressing is being used.
Bit
31
30
29
28
27
26
R/W
R/W
R/W
R/W
R/W
R/W
24
23
R/W
R/W
R/W
22
21
20
19
18
17
16
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Prefetchable base upper 32 bits
Name
Type
25
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Prefetchable base upper 32 bits
Name
Type
Default
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
4−12
Prefetchable base upper 32 bits
Read/Write
28h
0000 0000h
4.25 Prefetchable Limit Upper 32 Bits Register
The prefetchable limit upper 32 bits register plus the prefetchable memory limit register defines the base address of
the 64-bit prefetchable memory address range used by the bridge to determine when to forward memory transactions
from one interface to the other. The prefetchable limit upper 32 bits register must be programmed to all zeros when
32-bit addressing is being used.
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Prefetchable limit upper 32 bits
Name
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Type
Prefetchable limit upper 32 bits
Name
Type
Default
Register:
Type:
Offset:
Default:
Prefetchable limit upper 32 bits
Read/Write
2Ch
0000 0000h
4.26 I/O Base Upper 16 Bits Register
The I/O base upper 16 bits register specifies the upper 16 bits corresponding to AD31−AD16 of the 32-bit address
that specifies the base of the I/O range to forward from the primary PCI bus to the secondary PCI bus.
Bit
15
14
13
12
11
10
9
Type
Default
8
7
6
5
4
3
2
1
0
I/O base upper 16 bits
Name
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
I/O base upper 16 bits
Read/Write
30h
0000h
4.27 I/O Limit Upper 16 Bits Register
The I/O limit upper 16 bits register specifies the upper 16 bits corresponding to AD31−AD16 of the 32-bit address
that specifies the upper limit of the I/O range to forward from the primary PCI bus to the secondary PCI bus.
Bit
15
14
13
12
11
10
9
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
I/O limit upper 16 bits
Name
Type
8
Register:
Type:
Offset:
Default:
I/O limit upper 16 bits
Read/Write
32h
0000h
4−13
4.28 Capability Pointer Register
The capability pointer register provides the pointer to the PCI configuration header where the PCI power management
register block resides. The capability pointer provides access to the first item in the linked list of capabilities. The
capability pointer register is read-only and returns DCh when read, indicating the power management registers are
located at PCI header offset DCh.
Bit
7
6
5
4
3
2
1
0
Capability pointer register
Name
Type
R
R
R
R
R
R
R
R
Default
1
1
0
1
1
1
0
0
Register:
Type:
Offset:
Default:
Capability pointer
Read-only
34h
DCh
4.29 Expansion ROM Base Address Register
The PCI2050B bridge does not implement the expansion ROM remapping feature. The expansion ROM base
address register returns all 0s when read.
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Expansion ROM base address
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Expansion ROM base address
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Expansion ROM base address
Read-only
38h
0000 0000h
4.30 Interrupt Line Register
The interrupt line register is read/write and is used to communicate interrupt line routing information. Since the bridge
does not implement an interrupt signal terminal, this register defaults to 00h.
Bit
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
0
0
0
R/W
R/W
R/W
R/W
0
0
0
0
0
Interrupt line
Name
Type
Default
Register:
Type:
Offset:
Default:
4−14
Interrupt line
Read/Write
3Ch
00h
4.31 Interrupt Pin Register
The bridge default state does not implement any interrupt terminals. Reads from bits 7−0 of this register return 0s.
Bit
7
6
5
4
3
2
1
0
Type
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
Interrupt pin
Name
Register:
Type:
Offset:
Default:
Interrupt pin
Read-only
3Dh
00h
4.32 Bridge Control Register
The bridge control register provides many of the same controls for the secondary interface that are provided by the
command register for the primary interface. Some bits affect the operation of both interfaces.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Bridge control
Name
Type
R
R
R
R
R/W
R/W
R/W
R/W
R
R/W
R/W
R
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Bridge control
Read-only, Read/Write
3Eh
0000h
Table 4−5. Bridge Control Register Description
BIT
TYPE
15−12
R
11
R/W
Discard timer SERR enable.
0 = SERR signaling disabled for primary discard time-outs (default)
1 = SERR signaling enabled for primary discard time-outs
R/W
Discard timer status. Once set, this bit must be cleared by writing 1 to this bit.
0 = No discard timer error (default)
1 = Discard timer error. Either primary or secondary discard timer expired and a delayed transaction was discarded from
the queue in the bridge.
9
R/W
Secondary discard timer. Selects the number of PCI clocks that the bridge waits for a master on the secondary interface
to repeat a delayed transaction request.
0 = Secondary discard timer counts 215 PCI clock cycles (default)
1 = Secondary discard timer counts 210 PCI clock cycles
8
R/W
Primary discard timer. Selects the number of PCI clocks that the bridge waits for a master on the primary interface to repeat
a delayed transaction request.
0 = Primary discard timer counts 215 PCI clock cycles (default)
1 = Primary discard timer counts 210 PCI clock cycles
7
R
Fast back-to-back capable. The bridge never generates fast back-to-back transactions to different secondary devices. Bit
7 returns 0 when read.
R/W
Secondary bus reset. When bit 6 is set, the secondary reset signal (S_RST) is asserted. S_RST is deasserted by resetting
this bit. Bit 6 is encoded as:
0 = Do not force the assertion of S_RST (default).
1 = Force the assertion of S_RST.
10
6
FUNCTION
Reserved. Bits 15−12 return 0s when read.
4−15
Table 4−5. Bridge Control Register Description (continued)
BIT
TYPE
FUNCTION
5
R/W
Master abort mode. Bit 5 controls how the bridge responds to a master abort that occurs on either interface when the bridge
is the master. If this bit is set, the posted write transaction has completed on the requesting interface, and SERR enable
(bit 8) of the command register (offset 04h, see Section 4.3) is 1, then P_SERR is asserted when a master abort occurs.
If the transaction has not completed, then a target abort is signaled. If the bit is cleared, then all 1s are returned on reads
and write data is accepted and discarded when a transaction that crosses the bridge is terminated with master abort. The
default state of bit 5 after a reset is 0.
0 = Do not report master aborts (return FFFF FFFFh on reads and discard data on writes) (default).
1 = Report master aborts by signaling target abort if possible, or if SERR is enabled via bit 1 of this register, by
asserting SERR.
4
R
3
2
1
0
4−16
Reserved. Returns 0 when read. Writes have no effect.
R/W
VGA enable. When bit 3 is set, the bridge positively decodes and forwards VGA-compatible memory addresses in the video
frame buffer range 000A 0000h−000B FFFFh, I/O addresses in the range 03B0h−03BBh, and 03C0−03DFh from the
primary to the secondary interface, independent of the I/O and memory address ranges. When this bit is set, the bridge
blocks forwarding of these addresses from the secondary to the primary. Reset clears this bit. Bit 3 is encoded as:
0 = Do not forward VGA-compatible memory and I/O addresses from the primary to the secondary interface
(default).
1 = Forward VGA-compatible memory and I/O addresses from the primary to the secondary, independent of the I/O
and memory address ranges and independent of the ISA enable bit.
R/W
ISA enable. When bit 2 is set, the bridge blocks the forwarding of ISA I/O transactions from the primary to the secondary,
addressing the last 768 bytes in each 1K-byte block. This applies only to the addresses (defined by the I/O window registers)
that are located in the first 64K bytes of PCI I/O address space. From the secondary to the primary, I/O transactions are
forwarded if they address the last 768 bytes in each 1K-byte block in the address range specified in the I/O window registers.
Bit 2 is encoded as:
0 = Forward all I/O addresses in the address range defined by the I/O base and I/O limit registers (default).
1 = Block forwarding of ISA I/O addresses in the address range defined by the I/O base and I/O limit registers when
these I/O addresses are in the first 64K bytes of PCI I/O address space and address the top 768 bytes of each
1K-byte block.
R/W
SERR enable. Bit 1 controls the forwarding of secondary interface SERR assertions to the primary interface. Only when
this bit is set does the bridge forward S_SERR to the primary bus signal P_SERR. For the primary interface to assert SERR,
bit 8 of the command register (offset 04h, see Section 4.3) must be set.
0 = SERR disabled (default)
1 = SERR enabled
R/W
Parity error response enable. Bit 0 controls the bridge response to parity errors on the secondary interface. When this bit
is set, the bridge asserts S_PERR to report parity errors on the secondary interface.
0 = Ignore address and parity errors on the secondary interface (default).
1 = Enable parity error reporting and detection on the secondary interface.
5 Extension Registers
The TI extension registers are those registers that lie outside the standard PCI-to-PCI bridge device configuration
space (i.e., registers 40h−FFh in PCI configuration space in the PCI2050B bridge). These registers can be accessed
through configuration reads and writes. The TI extension registers add flexibility and performance benefits to the
standard PCI-to-PCI bridge. Mapping of the extension registers is contained in Table 4−1.
5.1 Chip Control Register
The chip control register contains read/write and read-only bits and has a default value of 00h. This register is used
to control the functionality of certain PCI transactions.
Bit
7
6
5
4
3
2
1
0
Chip control
Name
Type
R
R
R/W
R/W
R
R
R/W
R
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Chip control
Read/Write, Read-only
40h
00h
Table 5−1. Chip Control Register Description
BIT
TYPE
FUNCTION
7−6
R
5
R/W
Transaction forwarding control for I/O and memory cycles.
0 = Transaction forwarding controlled by bits 0 and 1 of the command register (offset 04h, see Section 4.3) (default).
1 = Transaction forwarding is disabled if GPIO3 is driven high.
4
R/W
Memory read prefetch. When set, bit 4 enables the memory read prefetch.
0 = Upstream memory reads are disabled (default).
1 = Upstream memory reads are enabled
3−2
R
1
R/W
0
R
Reserved. Bits 7−6 return 0s when read.
Reserved. Bits 3 and 2 return 0s when read.
Memory write and memory write and invalidate disconnect control.
0 = Disconnects on queue full or 4-KB boundaries (default)
1 = Disconnects on queue full, 4-KB boundaries and cacheline boundaries.
Reserved. Bit 0 returns 0 when read.
5−1
5.2 Extended Diagnostic Register
The extended diagnostic register is read or write and has a default value of 00h. Bit 0 of this register is used to reset
both the PCI2050B bridge and the secondary bus.
Bit
7
6
5
4
3
2
1
0
Extended diagnostic
Name
Type
R
R
R
R
R
R
R
W
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Extended diagnostic
Read-only, Write-only
41h
00h
Table 5−2. Extended Diagnostic Register Description
5−2
BIT
TYPE
FUNCTION
7−1
R
Reserved. Bits 7−1 return 0s when read.
0
W
Writing a 1 to this bit causes the PCI2050B bridge to set bit 6 of the bridge control register (offset 3Eh, see Section 4.32)
and then internally reset the PCI2050B bridge. Bit 6 of the bridge control register is not reset by the internal reset. Bit 0 is
self-clearing.
5.3 Arbiter Control Register
The arbiter control register is used for the bridge internal arbiter. The arbitration scheme used is a two-tier rotational
arbitration. The PCI2050B bridge is the only secondary bus initiator that defaults to the higher priority arbitration tier.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Arbiter control
Name
Type
R
R
R
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Arbiter control
Read-only, Read/Write
42h
0200h
Table 5−3. Arbiter Control Register Description
BIT
TYPE
FUNCTION
15−10
R
9
R/W
Bridge tier select. This bit determines in which tier the PCI2250 bridge is placed in the two-tier arbitration scheme.
0 = Low priority tier
1 = High priority tier (default)
8
R/W
GNT8 tier select. This bit determines in which tier the S_GNT8 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
7
R/W
GNT7 tier select. This bit determines in which tier the S_GNT7 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
6
R/W
GNT6 tier select. This bit determines in which tier the S_GNT6 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
5
R/W
GNT5 tier select. This bit determines in which tier the S_GNT5 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
4
R/W
GNT4 tier select. This bit determines in which tier the S_GNT4 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
3
R/W
GNT3 tier select. This bit determines in which tier the S_GNT3 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
2
R/W
GNT2 tier select. This bit determines in which tier the S_GNT2 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
1
R/W
GNT1 tier select. This bit determines in which tier the S_GNT1 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
0
R/W
GNT0 tier select. This bit determines in which tier the S_GNT0 is placed in the arbitration scheme. This bit is encoded as:
0 = Low priority tier (default)
1 = High priority tier
Reserved. Bits 15−10 return 0s when read.
5−3
5.4 P_SERR Event Disable Register
The P_SERR event disable register is used to enable/disable the SERR event on the primary interface. All events
are enabled by default.
Bit
7
6
5
4
3
2
1
0
P_SERR event disable
Name
Type
R
R/W
R/W
R/W
R/W
R/W
R/W
R
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
P_SERR event disable
Read-only, Read/Write
64h
00h
Table 5−4. P_SERR Event Disable Register Description
5−4
BIT
TYPE
FUNCTION
7
R
6
R/W
Master delayed read time-out.
0 = P_SERR signaled on a master time-out after 224 retries on a delayed read (default).
1 = P_SERR is not signaled on a master time-out.
5
R/W
Master delayed write time-out.
0 = P_SERR signaled on a master time-out after 224 retries on a delayed write (default).
1 = P_SERR is not signaled on a master time-out.
4
R/W
Master abort on posted write transactions. When set, bit 4 enables P_SERR reporting on master aborts on posted write
transactions.
0 = Master aborts on posted writes enabled (default)
1 = Master aborts on posted writes disabled
3
R/W
Target abort on posted writes. When set, bit 3 enables P_SERR reporting on target aborts on posted write transactions.
0 = Target aborts on posted writes enabled (default).
1 = Target aborts on posted writes disabled.
2
R/W
Master posted write time-out.
0 = P_SERR signaled on a master time-out after 224 retries on a posted write (default).
1 = P_SERR is not signaled on a master time-out.
1
R/W
Posted write parity error.
0 = P_SERR signaled on a posted write parity error (default).
1 = P_SERR is not signaled on a posted write parity error.
0
R
Reserved. Bit 7 returns 0 when read.
Reserved. Bit 0 returns 0 when read.
5.5 GPIO Output Data Register
The GPIO output data register controls the data driven on the GPIO terminals configured as outputs. If both an
output-high bit and an output-low bit are set for the same GPIO terminal, the output-low bit takes precedence. The
output data bits have no effect on a GPIO terminal that is programmed as an input.
Bit
7
6
5
4
3
2
1
0
GPIO output data
Name
Type
Default
Register:
Type:
Offset:
Default:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
GPIO output data
Read/Write
65h
00h
Table 5−5. GPIO Output Data Register Description
BIT
TYPE
FUNCTION
7
R/W
GPIO3 output high. Writing a 1 to this bit causes the GPIO signal to be driven high. Writing a 0 has no effect.
6
R/W
GPIO2 output high. Writing a 1 to this bit causes the GPIO signal to be driven high. Writing a 0 has no effect.
5
R/W
GPIO1 output high. Writing a 1 to this bit causes the GPIO signal to be driven high. Writing a 0 has no effect.
4
R/W
GPIO0 output high. Writing a 1 to this bit causes the GPIO signal to be driven high. Writing a 0 has no effect.
3
R/W
GPIO3 output low. Writing a 1 to this bit causes the GPIO signal to be driven low. Writing a 0 has no effect.
2
R/W
GPIO2 output low. Writing a 1 to this bit causes the GPIO signal to be driven low. Writing a 0 has no effect.
1
R/W
GPIO1 output low. Writing a 1 to this bit causes the GPIO signal to be driven low. Writing a 0 has no effect.
0
R/W
GPIO0 output low. Writing a 1 to this bit causes the GPIO signal to be driven low. Writing a 0 has no effect.
5.6 GPIO Output Enable Register
The GPIO output enable register controls the direction of the GPIO signal. By default all GPIO terminals are inputs.
If both an output-enable bit and an input-enable bit are set for the same GPIO terminal, the input-enable bit takes
precedence.
Bit
7
6
5
4
3
R/W
R/W
R/W
R/W
0
0
0
0
2
1
0
R/W
R/W
R/W
R/W
0
0
0
0
GPIO output enable
Name
Type
Default
Register:
Type:
Offset:
Default:
GPIO output enable
Read/Write
66h
00h
Table 5−6. GPIO Output Enable Register Description
BIT
TYPE
FUNCTION
7
R/W
GPIO3 output enable. Writing a 1 to this bit causes the GPIO signal to be configured as an output. Writing a 0 has no effect.
6
R/W
GPIO2 output enable. Writing a 1 to this bit causes the GPIO signal to be configured as an output. Writing a 0 has no effect.
5
R/W
GPIO1 output enable. Writing a 1 to this bit causes the GPIO signal to be configured as an output. Writing a 0 has no effect.
4
R/W
GPIO0 output enable. Writing a 1 to this bit causes the GPIO signal to be configured as an output. Writing a 0 has no effect.
3
R/W
GPIO3 input enable. Writing a 1 to this bit causes the GPIO signal to be configured as an input. Writing a 0 has no effect.
2
R/W
GPIO2 input enable. Writing a 1 to this bit causes the GPIO signal to be configured as an input. Writing a 0 has no effect.
1
R/W
GPIO1 input enable. Writing a 1 to this bit causes the GPIO signal to be configured as an input. Writing a 0 has no effect.
0
R/W
GPIO0 input enable. Writing a 1 to this bit causes the GPIO signal to be configured as an input. Writing a 0 has no effect.
5−5
5.7 GPIO Input Data Register
The GPIO input data register returns the current state of the GPIO terminals when read.
Bit
7
6
5
4
3
2
1
0
GPIO input data
Name
Type
R
R
R
R
R
R
R
R
Default
X
X
X
X
0
0
0
0
Register:
Type:
Offset:
Default:
GPIO input data
Read-only
67h
X0h
Table 5−7. GPIO Input Data Register Description
5−6
BIT
TYPE
FUNCTION
7−4
R
GPIO3−GPIO0 input data. These four bits return the current state of the GPIO terminals.
3−0
R
Reserved. Bits 3−0 return 0s when read.
5.8 Secondary Clock Control Register
The secondary clock control register is used to control the secondary clock outputs.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Secondary clock control
Name
Type
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Secondary clock control
Read-only, Read/Write
68h
0000h
Table 5−8. Secondary Clock Control Register Description
BIT
TYPE
FUNCTION
15−14
R
13
R/W
S_CLKOUT9 disable.
0 = S_CLKOUT9 enabled (default).
1 = S_CLKOUT9 disabled and driven high.
12
R/W
S_CLKOUT8 disable.
0 = S_CLKOUT8 enabled (default).
1 = S_CLKOUT8 disabled and driven high.
11
R/W
S_CLKOUT7 disable.
0 = S_CLKOUT7 enabled (default).
1 = S_CLKOUT7 disabled and driven high.
10
R/W
S_CLKOUT6 disable.
0 = S_CLKOUT6 enabled (default).
1 = S_CLKOUT6 disabled and driven high.
9
R/W
S_CLKOUT5 disable.
0 = S_CLKOUT5 enabled (default).
1 = S_CLKOUT5 disabled and driven high.
8
R/W
S_CLKOUT4 disable.
0 = S_CLKOUT4 enabled (default).
1 = S_CLKOUT4 disabled and driven high.
7−6
R/W
S_CLKOUT3 disable.
00, 01, 10 = S_CLKOUT3 enabled (00 is the default).
11 = S_CLKOUT3 disabled and driven high.
5−4
R/W
S_CLKOUT2 disable.
00, 01, 10 = S_CLKOUT2 enabled (00 is the default).
11 = S_CLKOUT2 disabled and driven high.
3−2
R/W
S_CLKOUT1 disable.
00, 01, 10 = S_CLKOUT1 enabled (00 is the default).
11 = S_CLKOUT1 disabled and driven high.
1−0
R/W
S_CLKOUT0 disable.
00, 01, 10 = S_CLKOUT0 enabled (00 is the default).
11 = S_CLKOUT0 disabled and driven high.
Reserved. These bits return 0 when read.
5−7
5.9 P_SERR Status Register
The P_SERR status register indicates what caused a SERR event on the primary interface.
Bit
7
6
5
4
3
2
1
0
P_SERR status
Name
Type
R
R/W
R/W
R/W
R/W
R/W
R/W
R
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
P_SERR status
Read-only Read/Write
6Ah
00h
Table 5−9. P_SERR Status Register Description
BIT
TYPE
FUNCTION
7
R
6
R/W
Master delayed read time-out. A 1 indicates that P_SERR was signaled because of a master time-out after 224 retries on
a delayed read.
5
R/W
Master delayed write time-out. A 1 indicates that P_SERR was signaled because of a master time-out after 224 retries on
a delayed write.
4
R/W
Master abort on posted write transactions. A 1 indicates that P_SERR was signaled because of a master abort on a posted
write.
3
R/W
Target abort on posted writes. A 1 indicates that P_SERR was signaled because of a target abort on a posted write.
2
R/W
Master posted write time-out. A 1 indicates that P_SERR was signaled because of a master time-out after 224 retries on
a posted write.
1
R/W
Posted write parity error. A 1 indicates that P_SERR was signaled because of parity error on a posted write.
0
R
Reserved. Bit 7 returns 0 when read.
Reserved. Bit 0 returns 0 when read.
5.10 Power-Management Capability ID Register
The power-management capability ID register identifies the linked list item as the register for PCI power management.
The power-management capability ID register returns 01h when read, which is the unique ID assigned by the PCI
SIG for the PCI location of the capabilities pointer and the value.
Bit
7
6
5
4
3
2
1
0
Power-management capability ID
Name
Type
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
1
Register:
Type:
Offset:
Default:
5−8
Power-management capability ID
Read-only
DCh
01h
5.11 Power-Management Next-Item Pointer Register
The power-management next-item pointer register is used to indicate the next item in the linked list of PCI
power-management capabilities. The next-item pointer returns E4h in CompactPCI mode, indicating that the
PCI2050B bridge supports more than one extended capability, but in all other modes returns 00h, indicating that only
one extended capability is provided.
Bit
7
6
5
4
3
2
1
0
Power-management next-item pointer
Name
Type
R
R
R
R
R
R
R
R
Default
1
1
1
0
0
1
0
0
Register:
Type:
Offset:
Default:
Power-management next-item pointer
Read-only
DDh
E4h cPCI mode
00h All other modes
5.12 Power-Management Capabilities Register
The power management capabilities register contains information on the capabilities of the PCI2050B functions
related to power management. The PCI2050B function supports D0, D1, D2, and D3 power states when MS1 is low.
The PCI2050B bridge does not support any power states when MS1 is high.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Power-management capabilities
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
1
1
0
0
0
0
0
0
0
1
0
Register:
Type:
Offset:
Default:
Power-management capabilities
Read-only
DEh
0602h or 0001h
Table 5−10. Power-Management Capabilities Register Description
BIT
TYPE
FUNCTION
15−11
R
PME support. This five-bit field indicates the power states that the device supports asserting PME. A 0 for any of these bits
indicates that the PCI2050B bridge cannot assert PME from that power state. For the PCI2050B bridge, these five bits return
00000b when read, indicating that PME is not supported.
10
R
D2 support. This bit returns 1 when MS0 is 0, indicating that the bridge function supports the D2 device power state. This
bit returns 0 when MS0 is 1, indicating that the bridge function does not support the D2 device power state.
9
R
D1 support. This bit returns 1 when MS0 is 0, indicating that the bridge function supports the D1 device power state. This
bit returns 0 when MS0 is 1, indicating that the bridge function does not support the D1 device power state.
8−6
R
Reserved. Bits 8−6 return 0s when read.
5
R
Device specific initialization. This bit returns 0 when read, indicating that the bridge function does not require special
initialization (beyond the standard PCI configuration header) before the generic class device driver is able to use it.
4
R
Auxiliary power source. This bit returns a 0 when read because the PCI2050B bridge does not support PME signaling.
3
R
PMECLK. This bit returns a 0 when read because the PME signaling is not supported.
2−0
R
Version. This three-bit register returns the PCI Bus Power Management Interface Specification revision.
001 = Revision 1.0, MS0 = 1
010 = Revision 1.1, MS0 = 0
5−9
5.13 Power-Management Control/Status Register
The power-management control/status register determines and changes the current power state of the PCI2050B
bridge. The contents of this register are not affected by the internally generated reset caused by the transition from
D3hot to D0 state.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Power-management control/status
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R/W
R/W
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Power-management control/status
Read-only, Read/Write
E0h
0000h
Table 5−11. Power-Management Control/Status Register
BIT
TYPE
15
R
PME status. This bit returns a 0 when read because the PCI2050B bridge does not support PME.
14−13
R
Data scale. This 2-bit read-only field indicates the scaling factor to be used when interpreting the value of the data
register. These bits return only 00b, because the data register is not implemented.
12−9
R
Data select. This 4-bit field is used to select which data is to be reported through the data register and data-scale
field. These bits return only 0000b, because the data register is not implemented.
8
R
PME enable. This bit returns a 0 when read because the PCI2050B bridge does not support PME signaling.
7−2
R
Reserved. Bits 7−2 return 0s when read.
1−0
5−10
R/W
FUNCTION
Power state. This 2-bit field is used both to determine the current power state of a function and to set the function
into a new power state. The definition of this is given below:
00 = D0
01 = D1
10 = D2
11 = D3hot
5.14 PMCSR Bridge Support Register
The PMCSR bridge support register is required for all PCI bridges and supports PCI-bridge-specific functionality.
Bit
7
6
5
4
3
2
1
0
PMCSR bridge support
Name
Type
R
R
R
R
R
R
R
R
Default
X
X
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
PMCSR bridge support
Read-only
E2h
X0h
Table 5−12. PMCSR Bridge Support Register Description
BIT
TYPE
7
R
6
FUNCTION
Bus power control enable. This bit returns the value of the MS1/BCC input.
0 = Bus power/ clock control disabled.
1 = Bus power/clock control enabled.
B2/B3 support for D3hot. This bit returns the value of MS1/BCC input. When this bit is 1, the secondary clocks
are stopped when the device is placed in D3hot. When this bit is 0, the secondary clocks remain on in all device
states.
R
Note: If the primary clock is stopped, then the secondary clocks stop because the primary clock is used to
generate the secondary clocks.
5−0
R
Reserved.
5.15 Data Register
The data register is an optional, 8-bit read-only register that provides a mechanism for the function to report
state-dependent operating data such as power consumed or heat dissipation. The PCI2050B bridge does not
implement the data register.
Bit
7
6
5
4
3
2
1
0
Data
Name
Type
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Data
Read-only
E3h
00h
5−11
5.16 HS Capability ID Register
The HS capability ID register identifies the linked list item as the register for cPCI hot-swap capabilities. The register
returns 06h when read, which is the unique ID assigned by the PICMG for PCI location of the capabilities pointer and
the value. In Intel™-compatible mode, this register is read-only and defaults to 00h.
Bit
7
6
5
4
3
2
1
0
HS capability ID
Name
Type
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
1
1
0
Register:
Type:
Offset:
Default:
HS capability ID
Read-only
E4h
06h TI mode
00h Intel-compatible mode
5.17 HS Next-Item Pointer Register
The HS next-item pointer register is used to indicate the next item in the linked list of cPCI hot swap capabilities.
Because this is the last extended capability that the PCI2050B bridge supports, the next-item pointer returns all 0s.
Bit
7
6
5
Type
R
R
R
R
Default
0
0
0
0
3
2
1
0
R
R
R
R
0
0
0
0
HS next-item pointer
Name
Register:
Type:
Offset:
Default:
5−12
4
HS next-item pointer
Read-only
E5h
00h
5.18 Hot-Swap Control Status Register
The hot-swap control status register contains control and status information for cPCI hot swap resources.
Bit
7
6
5
4
3
2
1
0
Hot swap control status
Name
Type
R
R
R
R
R/W
R
R/W
R
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Hot-swap control status
Read-only, Read/Write
E6h
00h
Table 5−13. Hot-Swap Control Status Register Description
BIT
TYPE
FUNCTION
7
R
ENUM insertion status. When set, the ENUM output is driven by the PCI2050B bridge. This bit defaults to 0, and is set after
a PCI reset occurs, the pre-load of serial ROM is complete, the ejector handle is closed, and bit 6 is 0. Thus, this bit is set
following an insertion when the board implementing the PCI2050B bridge is ready for configuration. This bit cannot be set
under software control.
6
R
ENUM extraction status. When set, the ENUM output is driven by the PCI2050B bridge. This bit defaults to 0, and is set
when the ejector handle is opened and bit 7 is 0. Thus, this bit is set when the board implementing the PCI2050B bridge
is about to be removed. This bit cannot be set under software control.
5−4
R
Reserved. Bits 5 and 4 return 0s when read.
3
R/W
LED ON/OFF. This bit defaults to 0, and controls the external LED indicator (HS_LED) under normal conditions. However,
for a duration following a PCI_RST, the HS_LED output is driven high by the PCI2050B bridge and this bit is ignored. When
this bit is interpreted, a 1 causes HS_LED high and a 0 causes HS_LED low.
Following PCI_RST, the HS_LED output is driven high by the PCI2050B bridge until the ejector handle is closed. When
these conditions are met, the HS_LED is under software control via this bit.
2
R
1
R/W
0
R
Reserved. Bit 2 returns 0 when read.
ENUM interrupt mask. This bit allows the HS_ENUM output to be masked by software. Bits 6 and 7 are set independently
from this bit.
0 = Enable HS_ENUM output
1 = Mask HS_ENUM output
Reserved. Bit 0 returns 0 when read.
5−13
5.19 Diagnostics Register
The diagnostics register enables or disables posted write combing of the PCI2050B bridge.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Diagnostics
Name
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R/W
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
TI Diagnostics
Read-only, read/write (see individual bit descriptions)
F0h
0000h
Table 5−14. Diagnostics Register Description
5−14
BIT
TYPE
15−1
R
0
R/W
FUNCTION
Reserved. Bits 15−1 return 0s when read.
Disable posted write combining.
0 = Enable posted write combining (default)
1 = Disable posted write combining
6 Electrical Characteristics
6.1 Absolute Maximum Ratings Over Operating Temperature Ranges †
Supply voltage range: VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 3.6 V
: P_VCCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 6 V
: S_VCCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 6 V
Input voltage range, VI: CMOS‡ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC + 0.5 V
Input voltage range, VI: PCI§ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 6 V
Output voltage range, VO: CMOS‡ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC + 0.5 V
Output voltage range, VO: PCI§ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 6 V
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
Virtual junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
†
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
‡ CMOS terminals are 23−25, 27−30, 32, 33, 35, 36, 38, 39, 41, 42, 126−130, 132−134 for PDV- and PPM-packaged devices, and J6, J18, J19,
K1, K2, K5, K6. K14, K17, K18, L1, L2, L5, L14, L15, L17,M1, M3, M6, N1, N2, N6, P1 for the GHK- and ZHK-packaged devices.
§ All signal terminals other than CMOS terminals are PCI terminals.
NOTES: 1. Applies for external input and bidirectional buffers. PCI terminals are measured with respect to VCCP instead of VCC. The limit is
specified for a dc condition.
2. Applies for external input and bidirectional buffers. PCI terminals are measured with respect to VCCP instead of VCC. The limit is
specified for a dc condition.
6−1
6.2 Recommended Operating Conditions (see Note 3)
OPERATION
VCC
Supply voltage (core)
Commercial
P VCCP
P_V
PCI primary bus I/O clamping rail voltage
Commercial
S VCCP
S_V
PCI secondary bus I/O clamping rail voltage
Commercial
PCI
VIH†
High le el input
inp t voltage
oltage
High-level
3.3 V
3.3 V
5V
3.3 V
5V
3.3 V
5V
CMOS
Low level input voltage
Low-level
VI
Input voltage
VO‡
Output voltage
tt
Input transition time (tr and tf)
TA
Operating ambient temperature range
TJ§
Virtual junction temperature
MAX
3.3
3.6
3
3.3
3.6
4.75
5
5.25
3
3.3
3.6
4.75
5
5.25
0.5 VCCP
VCCP
2
VCCP
0.7 VCC
VCC
0.57 VCCP
VCCP
P_RST_L
0.77 VCCP
VCCP
0.9 VCC
VCC
3.3 V
0
0.3 VCCP
5V
0
0.8
CMOS
0
0.2 VCC
CLK¶
0
0.2 VCCP
PCI
0
VCCP
CMOS
0
VCCP
Output voltage
0
VCC
PCI
1
4
CMOS
0
6
PCI2050B
0
25
70
PCI2050BI
−40
25
85
0
25
115
PCI
VIL
NOM
3
CLK¶
TRST_L
†
MIN
NOTES: 3. Unused terminals (input or I/O) must be held high or low to prevent them from floating.
† Applies to external input and bidirectional buffers without hysteresis
‡ Applies to external output buffers
§ These junction temperatures reflect simulation conditions. The customer is responsible for verifying junction temperature.
¶ CLK includes P_CLK and S_CLK terminals.
6−2
UNIT
V
V
V
V
V
V
V
ns
°C
°C
6.3 Electrical Characteristics Over Recommended Operating Conditions
PARAMETER
TERMINALS
PCI
VOH
O
High level output voltage
High-level
OPERATION
3.3 V
5V
CMOS1†
CMOS2‡
PCI
VOL
IIH
Low level output voltage
Low-level
High
g level input
p current
High-level
IOZ
Low-level
Low
level input current
High-impedance output current
MIN
MAX
IOH = −2 mA
2.4
IOH = −4 mA
2.1
IOH = −8 mA
2.1
V
3.3 V
IOL = 1.5 mA
0.1 VCC
5V
IOH = −2 mA
0.55
IOH = 4 mA
0.5
CMOS2‡
IOH = 8 mA
0.5
Input terminals
VI = VCCP
10
VI = VCCP
10
I/O
terminals§
VI = GND
−1
I/O
terminals§
VI = GND
−10
Pu
terminals¶
VI = GND
−60
VO = VCCP or GND
±10
Output terminals
UNIT
0.9 VCC
CMOS1†
Input terminals
IIL
TEST CONDITIONS
IOH = −0.5 mA
V
μ
A
μA
μA
μA
†
CMOS1 includes terminals 24, 25, 27, 28 for PDV- and PDM-packaged devices and K1, K2, K5, K6 for the GHK- and ZHK-packaged devices.
‡ CMOS2 includes terminals 29, 30, 33, 35, 36, 38, 39, 41, 42, 128, 130 for PDV- and PDM-packaged devices and K17, L1, L2, L5, L14, M1, M3,
M6, N1, N2, N6, P1 for the GHK- and ZHK-packaged devices.
§ For I/O terminals, the input leakage current (I and I ) includes the I
IL
IH
OZ leakage of the disabled output.
¶ Pu terminals include TDI, TMS, and TRST_L. These are pulled up with internal resistors.
6−3
6.4 66-MHz PCI Clock Signal AC Parameters
tc
t(h)
Vt(1)
Vt(2)
Vt(3)
P_CLK
t(l)
tr(SCLK)
tf(SCLK)
ts
ts
t(h)
t(l)
Vt(1)
Vt(2)
Vt(3)
S_CLK
tr(SCLK)
tf(SCLK)
tc
NOTE: Vt(1) = 2.0 V for 5-V clocks; 0.5 VCC for 3.3-V clocks
Vt(2) = 1.5 V for 5-V clocks; 0.4 VCC for 3.3-V clocks
Vt(3) = 0.8 V for 5-V clocks; 0.3 VCC for 3.3-V clocks
Figure 6−1. PCI Clock Signal AC Parameter Measurements
PARAMETER
MIN
MAX
P_CLK, S_CLK cycle time
15
t(h)
P_CLK, S_CLK high time
6
ns
t(l)
P_CLK, S_CLK low time
6
ns
t(PSS)
P_CLK, S_CLK slew rate (0.2 VCC to 0.6 VCC)
1.5
4
V/ns
td(SCLK)
Delay from P_CLK to S_CLK
0
7
ns
tr(SCLK)
P_CLK rising to S_CLK rising
0
7
ns
tf(SCLK)
P_CLK falling to S_CLK falling
0
7
ns
td(skew)
S_CLK0 duty cycle skew from P_CLK duty cycle
0.750
ns
tsk
S_CLKx to SCLKy
0.500
ns
6−4
30
UNIT
tc
ns
6.5 66-MHz PCI Signal Timing
CLK
Vtest
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
tv
Output
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
t(inval)
Valid
toff
ton
th
tsu
Valid
Input
NOTE: Vtest = 1.5 V for 5-V signals; 0.4 VCC for 3.3-V signals
Figure 6−2. PCI Signal Timing Measurement Conditions
PARAMETER
MIN
MAX
UNIT
tv(bus)
CLK to signal valid delay—bused signals (see Notes 4, 5, and 6)
2
6
ns
tv(ptp)
CLK to signal valid delay—point-to-point (see Notes 4, 5, and 6)
2
6
ns
ton
Float to active delay (see Notes 4, 5, and 6)
2
toff
Active to float delay (see Notes 4, 5, and 6)
tsu(bus)
Input setup time to CLK—bused signal (see Notes 4, 5, and 6)
3
ns
tsu(ptp)
Input setup time to CLK—point-to-point (see Notes 4, 5, and 6)
5
ns
th
Input signal hold time from CLK (see Notes 4 and 5)
0
ns
ns
14
ns
NOTES: 4. See Figure 6−2
5. All primary interface signals are synchronized to P_CLK and all secondary interface signals are synchronized to S_CLK.
6. Bused signals are as follows:
P_AD, P_C/BE, P_PAR, P_PERR, P_SERR, P_FRAME, P_IRDY, P_TRDY, P_LOCK, P_DEVSEL, P_STOP, P_IDSEL, S_AD,
S_C/BE, S_PAR, S_PERR, S_SERR, S_FRAME, S_IRDY, S_TRDY, S_LOCK, S_DEVSEL, S_STOP
Point-to-point signals are as follows:
P_REQ, S_REQx, P_GNT, S_GNTx
6−5
6.6 Parameter Measurement Information
LOAD CIRCUIT PARAMETERS
TIMING
PARAMETER
tPZH
ten
tPZL
tPHZ
tdis
tPLZ
tpd
†
‡
CLOAD†
(pF)
IOL
(mA)
IOH
(mA)
VLOAD
(V)
50
8
−8
0
3
50
8
−8
1.5
50
8
−8
‡
IOL
Test
Point
From Output
Under Test
VLOAD
CLOAD
CLOAD includes the typical load-circuit distributed capacitance.
VLOAD − VOL
= 50 Ω, where VOL = 0.6 V, IOL = 8 mA
IOL
IOH
LOAD CIRCUIT
VCC
Timing
Input
(see Note A )
Data
Input
50% VCC
tsu
90% VCC
10% VCC
0V
th
High-Level
Input
50% VCC
0V
tf
In-Phase
Output
50% VCC
tpd
Out-of-Phase
Output
50% VCC
50% VCC
50% VCC
0V
VOH
50% VCC
VOL
Waveform 1
(see Notes B and C)
tPLZ
50% VCC
tPZH
Waveform 2
(see Notes B and C)
50% VCC
0V
tPZL
0V
VOH
50% VCC
VOL
tpd
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
50% VCC
VCC
Output
Control
(Low-Level
Enabling)
tpd
tpd
0V
VOLTAGE WAVEFORMS
PULSE DURATION
VCC
50% VCC
VCC
VCC
Low-Level
Input
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
INPUT RISE AND FALL TIMES
50% VCC
50% VCC
tw
VCC
50% VCC
tr
Input
(see Note A)
50% VCC
tPHZ
50% VCC
VCC
≈ 50% VCC
VOL + 0.3 V
VOL
VOH
VOH − 0.3 V
≈ 50% VCC
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
NOTES: A. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by pulse generators having the
following characteristics: PRR = 1 MHz, ZO = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. For tPLZ and tPHZ, VOL and VOH are measured values.
Figure 6−3. Load Circuit and Voltage Waveforms
6−6
6.7 PCI Bus Parameter Measurement Information
PCLK
tw
RSTIN
tsu
Figure 6−4. RSTIN Timing Waveforms
6−7
6−8
7 Mechanical Data
The PCI2050B device is packaged either in a GHK 257-ball MicroStar BGA™, a 208-terminal PDV package, a
208-terminal PPM package, or a RoHS-compliant ZHK 257-ball MicroStar BGA™. The following shows the
mechanical dimensions for the GHK, PDV, PPM, and ZHK packages. The GHK and ZHK packages are mechanically
identical; therefore, only the GHK mechanical drawing is shown.
GHK (S-PBGA-N257)
PLASTIC BALL GRID ARRAY
16,10
SQ
15,90
A1 Corner
0,95
Bottom View
0,85
1,40 MAX
Seating Plane
0,55
0,45
0,08
0,45
0,35
0,12
4145273-4/E 08/02
NOTES: D. All linear dimensions are in millimeters.
E. This drawing is subject to change without notice.
F. MicroStar BGA™ configuration.
MicroStar BGA is a trademark of Texas Instruments.
7−1
PDV (LF-PQFP-G208)
PLASTIC QUAD FLATPACK
156
105
157
104
0,27
0,17
0,08 M
0,50
0,13 NOM
208
53
1
52
Gage Plane
25,50 TYP
28,05 SQ
27,95
0,25
0,05 MIN
0°− 7°
30,20
SQ
29,80
0,75
0,45
1,45
1,35
Seating Plane
0,08
1,60 MAX
4087729/D 11/98
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-026
7−2
PPM (S-PQFP-G208)
PLASTIC QUAD FLATPACK
156
105
157
104
0,27
0,17
0,08 M
0,50
208
53
1
0,16 NOM
52
25,50 TYP
28,20
SQ
27,80
Gage Plane
30,80
SQ
30,40
3,60
3,20
0,25
0,25 MIN
0°− 7°
0,75
0,50
Seating Plane
4,10 MAX
0,08
4040025 / B 03/95
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Falls within JEDEC MO-143
7−3
7−4
PACKAGE OPTION ADDENDUM
www.ti.com
19-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
(3)
Device Marking
Samples
(4/5)
(6)
PCI2050BIPDV
ACTIVE
LQFP
PDV
208
36
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
PCI2050BIPDV
Samples
PCI2050BIPDVG4
ACTIVE
LQFP
PDV
208
36
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
PCI2050BIPDV
Samples
PCI2050BIZWT
ACTIVE
NFBGA
ZWT
257
90
RoHS & Green
SNAGCU
Level-3-260C-168 HR
-40 to 85
PCI2050BIZWT
Samples
PCI2050BPDV
ACTIVE
LQFP
PDV
208
36
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
PCI2050BPDV
Samples
PCI2050BPDVG4
ACTIVE
LQFP
PDV
208
36
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
PCI2050BPDV
Samples
PCI2050BZWT
ACTIVE
NFBGA
ZWT
257
90
RoHS & Green
SNAGCU
Level-3-260C-168 HR
PCI2050BZWT
Samples
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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