Rtc Battery; I 2 C Eeprom; Table 21: I 2 C Expander I/O Port Assignment; Table 22: I 2 C Eeprom Type - Enclustra Mars PM3-R5 User Manual

Table 21 shows the connection of the I
I/O Bit Signal
I/O[0] PCIE_PERST#
I/O[1] 10k Pull up
I/O[2] FX3_SLCS#
I/O[3] FX3_A0
I/O[4] USB_CPEN
I/O[5] FX3_USB_SEL
I/O[6] PCIE_I2C_EN
I/O[7] IO_I2C_EN
Starting with revision 5.2 of the PM3 board the I2C GPIO expander is not equipped any more, as this
part is end-of-life. For details, please refer to the Mars PM3 R5.2 Known Issues and Changes document
and to Mars PM3 R5.2 Patch Specification.
2.9.6

RTC Battery

The battery on the Mars PM3 Board is used for the real time clock on the FPGA module. A 3V CR1220
battery can be placed here if needed.
2.9.7 I 2 C EEPROM
A Microchip 128 kBit EEPROM (U902) is connected to the I
address 0x54 (7 bit) and can be used to store user data (e.g. a serial number) and can be accessed by
the FPGA and the Cypress FX3 USB 3.0 controller. For more details refer to the 24AA128 datasheet
Type
24AA128
The write-protect signal of the user EEPROM is equipped with a 10k pull-up and it is connected to the
I2C GPIO expander. By default, the EEPROM is write-protected. To allow write operations, this signal
must be pulled low from the I2C expander.
23/04/2019
2 C expander's GPIO pins.
Description
PCIe reset signal
EEPROM_WP signal (user EEPROM write-protect signal)
Slave fifo chip select
Slave fifo address bit 0
USB 2.0 power enable (Host connector J501)
1: USB signals from FPGA module routed to J500 (USB 3.0 disabled)
0: USB signals from FPGA module routed to J501 (USB 3.0 routed to
J500)
Enable signal for I C bus on HDMI connector
2
Enable signal for I C bus on FMC and extension connector
2
Table 21: I 2 C expander I/O port assignment
Manufacturer
Microchip
Table 22: I 2 C EEPROM Type
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C bus on the Mars PM3 Board. It listens to
2
4 .
Version 1.09