FMC Pcam Adapter Reference Manual
The FMC Pcam Adapter is an FMC mezzanine (peripheral) board allowing interfacing up to four
Pcam camera modules to field‐programmable gate array (FPGA) based systems. It extends the
capabilities of development platforms to enable multi‐camera video applications.
Features
Two/Four Pcam system‐side connectors
Level translators from MIPI D‐PHY to LVDS and LVCMOS
Male FMC LPC connector for digital signals
Compatible with a wide range of VADJ voltages (1.8V – 3.3V)
Purchasing Options
There are two variants available: Dual and Quad, based on the number of Pcam connectors and
related circuitry. Dual makes connecting two Pcam 5C (or similar) possible, with Quad
increasing that to four.
Revision History
Created April 9, 2019
This manual applies to REV C.0 of both variants (Dual and Quad) of the board.
Carrier Card Compatibility
As with any FMC mezzanine module, there are some compatibility requirements. These must
be evaluated before connecting and powering the module.
Supported VADJ voltage range is 1.8 V ‐ 3.3 V. The voltage is controlled by the carrier card.
The carrier card must be capable of providing enough current. See Power Supplies.
Must use I/O standards compatible with the voltage levels of the digital outputs, and the chosen
VADJ. For example, LVDS_25 and LVCMOS25 with a VADJ of 2.5V.
Receiver signal termination for outputs is the responsibility of the carrier card. For example,
DIFF_TERM can be used for LVDS_25 and a VADJof 2.5V.
The carrier card might have either the low‐pin count or the high‐pin count FMC female
connector. However, not all pins are required to be wired. Compare the carrier card FMC pin‐
out against the pin‐out from chapter 1.4 below.
FPGA I/O Architecture Compatibility
Receiving several independent source‐synchronous high‐speed interfaces in the FPGA is no easy
feat due to I/O and clocking restrictions specific to the FPGA architecture. The VITA 57.1 specs
are not granular enough for the requirements of today's high‐speed I/O architectures.
Therefore, not all carrier cards will be able to support all ports of the FMC Pcam Adapter
simultaneously. Some of the requirements are:
Clock inputs are mapped to LA00, LA01, LA17, and LA18. Verify that the carrier board maps
these to clock‐capable input pins.
Each clock has two data lanes associated with it. Verify that the clock signal can be routed to I/O
primitives sampling the data lanes. On some architectures the clock and its data lanes must be
mapped to the same bank.
Two ports are mapped to LA00‐LA16, and the other two mapped to LA17‐LA33. Usually, carrier
cards split these groups into separate banks. Therefore, each bank must support two ports at
once. This puts a considerable constraint on the resources available in each bank. Clock buffers,
PLLs and high‐speed de‐serialization primitives must be capable of receiving two independent D‐
PHY interfaces. The UltraScale architecture in particular has a very restrictive clock/strobe
propagation mechanism. The side‐effect of propagation is that some pins are made unavailable
for other purposes including other Pcam ports. This might include pins unrelated to FMC, but
mapped to the FMC bank.
Digilent recommends implementing an RTL design with the desired number of D‐PHY interfaces
constrained to the pinout of the carrier card to be used for development before committing to
the FMC Pcam Adapter.
Compatibility Matrix
The table below lists carrier cards confirmed compatible by Digilent. Boards not listed can still
be compatible, if the requirements above are met. Check back for updates as the list will be
extended.
Carrier
Card
Manufacturer
ZedBoard Digilent
FMC Port
J1 (LPC)
VADJ
2.5 V
Simultaneous Pcam Port Usage
A
B
C
D
✔
✔
✔
✔
Table 1. Confirmed compatibility matrix.
1. Functional Description
The adapter board's main purpose is to translate the MIPI D‐PHY input to LVDS/LVCMOS
outputs that are supported on most FPGAs. It also translates the 3.3V control signals of the
Pcam to the adjustable I/O voltage powering the FMC bank, VADJ. Therefore, compatibility is
extended to boards with FPGAs that have only low‐voltage I/O banks (
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