USB2504A

USB2504/ USB2504A Integrated USB 2.0 Compatible 4-Port Hub PRODUCT FEATURES Integrated USB 2.0 Compatible 4-Port Hub — 4 Transaction Translators for highest performance — High-Speed (480Mbits/s), Full-Speed (12Mbits/s) and Low-Speed (1.5Mbits/s) compatible — Full power management with per port or ganged, selectable power control — Detects Bus-Power/Self-Power source and changes mode automatically Datasheet On-Board 24MHz Crystal Driver Circuit or 24 MHz external clock driver Internal PLL for 480MHz USB 2.0 Sampling Internal 1.8V Linear Voltage Regulator Integrated USB termination and Pull-up/Pull-down resistors Internal Short Circuit protection of USB differential signal pins 1.8 Volt Low Power Core Operation 3.3 Volt I/O with 5V Input Tolerance 64-Pin TQFP lead-free RoHS compliant package Complete USB Specification 2.0 Compatibility — Includes USB 2.0 Transceivers VID/PID/DID, and Port Configuration for Hub via: — Single Serial I2C EEPROM — SMBus Slave Port Default VID/PID/DID, allows functionality when configuration EEPROM is absent Hardware Strapping options allow for configuration without an external EEPROM or SMBus Host SMSC USB2504/USB2504A DATASHEET Revision 2.3 (08-27-07) Integrated USB 2.0 Compatible 4-Port Hub Datasheet ORDER NUMBERS: USB2504/USB2504A-JT FOR 64 PIN TQFP LEAD-FREE ROHS COMPLIANT PACKAGE 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright © 2007 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Revision 2.3 (08-27-07) 2 SMSC USB2504/USB2504A DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Table of Contents Chapter 1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1 OEM Selectable Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Chapter 2 Pin Table 4-Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Chapter 3 Pin Configuration 4-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Chapter 4 4-Port Hub Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Chapter 5 Functional Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.1 4-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1.1 Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1.2 VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2.1 I2C EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2.2 In-Circuit EEPROM Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2.3 EEPROM DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.1 Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.2 Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.3 General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.4 Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.5 Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.6 SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.7 Bus Reset Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.8 SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.9 Internal SMBus Memory Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6.1 External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6.2 USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 16 19 19 19 20 20 25 25 26 26 27 27 27 27 27 27 33 33 34 34 37 5.2 5.3 5.4 5.5 5.6 Chapter 6 Backward Compatibility to the USB20H04. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 6.1 6.2 6.3 6.4 Internal 1.8V regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration by Internal Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration by SMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PRTPWR_POL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 39 39 39 Chapter 7 XNOR Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Chapter 8 DC Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 8.1 8.2 Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Recommended Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Chapter 9 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 9.1 Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1.1 SMBus Interface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1.2 I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1.3 USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 45 45 45 45 SMSC USB2504/USB2504A Revision 2.3 (08-27-07) DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Chapter 10 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Revision 2.3 (08-27-07) 4 SMSC USB2504/USB2504A DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet List of Figures Figure 3.1 Figure 4.1 Figure 5.1 Figure 5.2 Figure 5.3 Figure 5.4 Figure 10.1 4-Port 64 Pin TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4-Port Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 LED Strapping Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 64 Pin TQFP Package Outline (10x10x1.4 mm body - 2 mm footprint) . . . . . . . . . . . . . . . . . 46 SMSC USB2504/USB2504A 5 Revision 2.3 (08-27-07) DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet List of Tables Table 2.1 4-Port Pin Table for 64-TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 4.1 4-Port Hub Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 4.2 SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 4.3 Miscellaneous Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 4.4 Power, Ground, and No Connect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 4.5 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 5.1 User-Defined Descriptor Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 5.2 SMBus Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Table 5.3 SMBus Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Table 5.4 SMBus Slave Interface Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Table 5.5 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Table 5.6 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Table 5.7 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Table 8.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Table 10.1 64 Pin TQFP Package Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Revision 2.3 (08-27-07) 6 SMSC USB2504/USB2504A DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Chapter 1 General Description The SMSC 4-Port Hub is fully compliant with the USB 2.0 Specification and will attach to a USB host as a Full-Speed Hub or as a Full-/High-Speed Hub. The 4-Port Hub supports Low-Speed, Full-Speed, and High-Speed (if operating as a High-Speed Hub) downstream devices on all of the enabled downstream ports. A dedicated Transaction Translator (TT) is available for each downstream facing port. This architecture ensures maximum USB throughput for each connected device when operating with mixed-speed peripherals. The Hub works with an external USB power distribution switch device to control VBUS switching to downstream ports, and to limit current and sense over-current conditions. All required resistors on the USB ports are integrated into the Hub. This includes all series termination resistors on D+ and D– pins and all required pull-down and pull-up resistors on D+ and D– pins. The over-current sense inputs for the downstream facing ports have internal pull-up resistors. Throughout this document the upstream facing port of the hub will be referred to as the upstream port, and the downstream facing ports will be called the downstream ports. 1.1 OEM Selectable Features A default configuration is available in the USB2504/USB2504A following a reset. This configuration may be sufficient for some applications. Strapping option pins make it possible to modify a limited subset of the configuration options. The USB2504/USB2504A may also be configured by an external EEPROM or a microcontroller. When using the microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pinstrapped for external EEPROM configuration but no external EEPROM is present, then a value of ‘0’ will be written to all configuration data bit fields (the hub will attach to the host with all ‘0’ values). The 4-Port Hub supports several OEM selectable features: Operation as a Self-Powered USB Hub or as a Bus-Powered USB Hub. Operation as a Dynamic-Powered Hub (Hub operates as a Bus-Powered device if a local power source is not available and switches to Self-Powered operation when a local power source is available). Multiple Transaction Translator (Multi-TT) or Single-TT support. Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from an external SMBus Host. Port power switching on an individual or ganged basis. Port over-current monitoring on an individual or ganged basis. LED indicator support. Compound device support (port is permanently hardwired to a downstream USB peripheral device). Hardware strapping options enable configuration of the following features. Non-Removable Ports Port Power Polarity (active high or active low logic) Port Disable LED support MTT enable Ganged Vs Port power switching and over-current sensing SMSC USB2504/USB2504A 7 Revision 2.3 (08-27-07) DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Chapter 2 Pin Table 4-Port Table 2.1 4-Port Pin Table for 64-TQFP UPSTREAM USB 2.0 INTERFACE (3 PINS) USBDP0 USBDN0 VBUS_DET 4-PORT USB 2.0 INTERFACE (26 PINS) USBDP1 USBDP3 GR1/ NON_REM0 AM1/ GANG_EN PRTPWR1 OCS1_N PRTPWR_POL USBDN1 USBDN3 GR2/ NON_REM1 AM2/ MTT_EN PRTPWR2 OCS2_N RBIAS SERIAL PORT INTERFACE (5 PINS) SDA/SMBDATA CFG_SEL0 MISC (8 PINS) XTAL1/CLKIN ATEST/ REG_EN XTAL2 CLKIN_EN RESET_N TEST1 SELF_PWR TEST0 SCL/SMBCLK/ CFG_SEL2 CFG_SEL1 USBDP2 USBDP4 GR3/ PRT_DIS0 AM3 PRTPWR3 OCS3_N USBDN2 USBDN4 GR4/ PRT_DIS1 AM4/ LED_EN PRTPWR4 OCS4_N POWER, GROUND (17 PINS) AND (5) NO CONNECT Revision 2.3 (08-27-07) 8 SMSC USB2504/USB2504A DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Chapter 3 Pin Configuration 4-Port Hub SDA/SMBDATA SCL/SMBCLK CLKIN_EN PRTPWR1 PRTPWR3 OCS1_N OCS4_N VDD18 VSS CFG_SEL0 PRTPWR2 PRTPWR4 OCS2_N OCS3_N TEST1 48 RESET_N CFG_SEL1 SELF_PWR VBUS_DET VSS VDD18 VSS NC XTAL2 XTAL1/CLKIN CFG_SEL2 VDDA18PLL VDDA33PLL ATEST/REG_EN RBIAS VSS 49 33 NC 32 NC TEST0 VDD18 VSS VDD33 GR1/NON_REM0 AM1/GANG_EN USB2504 & USB2504A GR2/NON_REM1 AM2/MTT_EN PRTPWR_POL GR3/PRT_DIS0 AM3 GR4/PRT_DIS1 AM4/LED_EN NC 64 16 1 17 NC USBDP0 USBDP1 USBDP3 VDDA33 USBDN1 USBDN0 USBDN2 USBDN3 VDDA33 Figure 3.1 4-Port 64 Pin TQFP SMSC USB2504/USB2504A 9 USBDN4 VDDA33 VSS USBDP2 USBDP4 VSS VSS Revision 2.3 (08-27-07) DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Chapter 4 4-Port Hub Block Diagram To EEPROM Pin 1.8V Strapping or SMBus Master Cap Options SD SCL Upstream Upstream 24 MHz USB Data VBUS Crystal 3.3V Upstream PHY VBUS Power Detect PLL 1.8V Reg. Internal Defaults Select Serial Interface Repeater SIE Controller TT #1 TT #2 TT #3 TT #4 Port Controller Routing Logic Port #1 Downstream OC Sense PHY #1 Switch Driver LED Drivers ... Port #4 Downstream OC Sense PHY #4 Switch Driver LED Drivers Downstream OC Switch/LED USB Data Sense Drivers Downstream OC Switch/LED USB Data Sense Drivers Figure 4.1 4-Port Block Diagram Table 4.1 4-Port Hub Pin Descriptions NAME SYMBOL TYPE UPSTREAM USB 2.0 INTERFACE USB Bus Data Detect Upstream VBUS Power USBDN0 USBDP0 VBUS_DET IO-U I/O12 These pins connect to the upstream USB bus data signals. Detects state of Upstream VBUS power. The SMSC Hub monitors VBUS_DET to determine when to assert the internal D+ pull-up resistor (signalling a connect event). When designing a detachable hub, this pin must be connected to the VBUS power pin of the USB port that is upstream of the hub. (Use of a weak pull-down resistor is recommended.) For self-powered applications with a permanently attached host, this pin must be pulled-up to either 3.3V or 5.0V (typically VDD33). FUNCTION Revision 2.3 (08-27-07) 10 SMSC USB2504/USB2504A DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Table 4.1 4-Port Hub Pin Descriptions (continued) NAME SYMBOL TYPE 4-PORT USB 2.0 HUB INTERFACE High-Speed USB Data USB Power Enable USBDN[4:1] USBDP[4:1] PRTPWR[4:1] IO-U O12 These pins connect to the downstream USB peripheral devices attached to the Hub’s ports. Enables power to USB peripheral devices (downstream). The active signal level of the PRTPWR[4:1] pins is determined by the Power Polarity Strapping function of the PRTPWR_POL pin. GR[4:3]/ PRT_DIS[1:0] I/O12 Green indicator LED for ports 4 and 3. Will be active low when LED support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration, these pins will be sampled at RESET_N negation to determine if ports [4:2] will be permanently disabled. Also, the active state of the LED’s will be determined as follows: PRT_DIS[1:0] = ‘00’, All ports are enabled, GR4 is active high, GR3 is active high. PRT_DIS[1:0] = ‘01’, Port 4 is disabled, GR4 is active high, GR3 is active low. PRT_DIS[1:0] = ‘10’, Ports 4 & 3 are disabled, GR4 is active low, GR3 is active high. PRT_DIS[1:0] = ‘11’, Ports 4, 3 & 2 are disabled, GR4 is active low, GR3 is active low. Port [2:1] Green LED & Port NonRemovable strapping option. GR[2:1]/ NON_REM[1:0] I/O12 Green indicator LED for ports 2 and 1. Will be active low when LED support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration, these pins will be sampled at RESET_N negation to determine if ports [3:1] contain permanently attached (nonremovable) devices. Also, the active state of the LED’s will be determined as follows: NON_REM[1:0] = ‘00’, All ports are removable, GR2 is active high, GR1 is active high. NON_REM[1:0] = ‘01’, Port 1 is non-removable, GR2 is active high, GR1 is active low. NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable, GR2 is active low, GR1 is active high. NON_REM[1:0] = ‘11’, Ports 1, 2, & 3 are non-removable, GR2 is active low, GR1 is active low. FUNCTION Port 4:3 Green LED & Port Disable strapping option. SMSC USB2504/USB2504A 11 Revision 2.3 (08-27-07) DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Table 4.1 4-Port Hub Pin Descriptions (continued) NAME Port 4 Amber LED & LED Enable strapping option SYMBOL AM4/ LED_EN TYPE I/O12 FUNCTION Amber indicator LED for port 4. Will be active low when LED support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration, this pin will be sampled at RESET_N negation to determine if LED support is enabled or disabled. Also, the active state of the LED will be determined as follows: ‘0’ = LED support is disabled, LED is inactive ‘1’ = LED Support is enabled, LED is active low. Port 3 Amber LED Port 2 Amber LED & MTT Disable AM3 AM2/ MTT_EN I/O12 I/O12 Amber indicator LED for port 3. Signal will be active low. Amber indicator LED for port 2. Will be active low when LED support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration, this pin will be sampled at RESET_N negation to determine if MTT support is disabled (STT only). Also, the active state of the LED will be determined as follows: ‘0’ = MTT support is disabled, LED is active high ‘1’ = MTT support is enabled, LED is active low. Port 1 Amber LED & Gang Power Switching and Current Sensing strapping option. AM1/ GANG_EN I/O12 Amber indicator LED for port 1, Will be active low when LED support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration, this pin will be sampled at RESET_N negation to determine if downstream port power switching and current sensing are ganged, or individual port-by-port. Also, the active state of the LED will be determined as follows: ‘0’ = Port-by-port sensing & switching, LED is active high ‘1’ = Ganged sensing & switching, LED is active low. Port Power Polarity strapping. PRTPWR_POL I/O12 Port Power Polarity strapping determination for the active signal polarity of the [4:1]PRTPWR pins. While RESET_N is asserted, the logic state of this pin will (though the use of internal combinatorial logic) determine the active state of the [4:1]PRTPWR pins in order to ensure that downstream port power is not inadvertently enabled to inactive ports during a hardware reset. On the rising edge of RESET_N (see the applicable RESET_N timing table in Section 5.6.1), the logic value will be latched internally, and will retain the active signal polarity for the PRTPWR[4:1] pins. ‘1’ = PRTPWR[4:1]_P/N pins have an active ‘high’ polarity ‘0’ = PRTPWR[4:1]_P/N pins have an active ‘low’ polarity Over Current Sense USB Transceiver Bias OCS[4:1]_N IPU Input from external current monitor indicating an overcurrent condition. {Note: Contains internal pull-up to 3.3V supply} A 12.0kΩ (+/− 1%) resistor is attached from ground to this pin to set the transceiver’s internal bias settings. RBIAS I-R Revision 2.3 (08-27-07) 12 SMSC USB2504/USB2504A DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Table 4.1 4-Port Hub Pin Descriptions (continued) NAME SYMBOL TYPE SERIAL PORT INTERFACE Serial Data/SMB Data Serial Clock/SMB Clock Configuration Programming Select Configuration Programming Select Configuration Programming Select SDA/SMBDATA SCL/SMBCLK IOSD12 IOSD12 (Serial Data)/(SMB Data) signal. (Serial Clock)/(SMB Clock) signal. FUNCTION CFG_SEL0 IOSD12 This multifunction pin is read on the rising edge of RESET_N negation and will determine the hub configuration method as described in Table 4.2. This pin is read on the rising edge of RESET_N (see the applicable RESET_N timing table in Section 5.6.1) and will determine the hub configuration method as described in Table 4.2. This pin is read on the rising edge of RESET_N negation and will determine the hub configuration method as described in Table 4.2. CFG_SEL1 I CFG_SEL2 I Table 4.2 SMBus or EEPROM Interface Behavior CFG_SEL2 X X 0 1 X CFG_SEL1 0 0 1 1 1 CFG_SEL0 0 1 0 0 1 SMBus or EEPROM interface behavior. Configured as an SMBus slave for external download of userdefined descriptors. SMBus slave address is 0101100 Configured as an SMBus slave for external download of userdefined descriptors. SMBus slave address is 0101101 Internal Default Configuration Internal Default Configuration via strapping options. 2-wire (I2C) EEPROMS are supported, Table 4.3 Miscellaneous Pins NAME Crystal Input/External Clock Input Crystal Output SYMBOL XTAL1/ CLKIN XTAL2 TYPE ICLKx FUNCTION 24MHz crystal or external clock input. This pin connects to either one terminal of the crystal or to an external 24MHz clock when a crystal is not used. 24MHz Crystal This is the other terminal of the crystal, or left unconnected when an external clock source is used to drive XTAL1/CLKIN. It must not be used to drive any external circuitry other than the crystal circuit. Clock In Enable: Low = XTAL1 and XTAL2 pins configured for use with external crystal High = XTAL1 pin configured as CLKIN, and must be driven by an external CMOS clock. OCLKx Clock Input Enable CLKIN_EN I SMSC USB2504/USB2504A 13 Revision 2.3 (08-27-07) DATASHEET Integrated USB 2.0 Compatible 4-Port Hub Datasheet Table 4.3 Miscellaneous Pins (continued) NAME RESET Input Self-Power / Bus-Power Detect TEST Pins Analog Test & Internal 1.8V voltage regulator enable SYMBOL RESET_N SELF_PWR TYPE IS I FUNCTION This active low signal is used by the system to reset the chip. The minimum active low pulse is 1us. Detects availability of local self-power source. Low = Self/local power source is NOT available (i.e., Hub gets all power from Upstream USB VBus). High = Self/local power source is available. Used for testing the chip. User must treat as a noconnect or connect to ground. This signal is used for testing the analog section of the chip, and to enable or disable the internal 1.8v regulator. This pin must be connected to VDDA33 to enable the internal 1.8V regulator, or to VSS to disable the internal regulator. When the internal regulator is enabled, the 1.8V power pins must be left unconnected, except for the required bypass capacitors.When the PHY is in test mode, the internal regulator is disabled and the ATEST pin functions as a test pin. TEST[1:0] ATEST/ REG_EN IPD AIO Table 4.4 Power, Ground, and No Connect NAME VDD1P8 SYMBOL VDD18 TYPE +1.8V core power. If the internal regulator is enabled, then VDD18 pin 54 must have a 4.7μF (or greater) ±20% (ESR