Ethernet PHY Status LEDs
[Figure 2, callout 23]
Two Ethernet PHY status LEDs are integrated into the metal frame of the P2 RJ-45 connector,
installed on the top edge and towards the back of the VCU128 board. The two PHY status LEDs
are visible within the frame of the RJ45 Ethernet jack as shown in the following gure. As viewed
from the front opening, the le green LED is the link acvity indicator and the right green LED is
the 1000BASE-T link mode indicator.
Figure 24: Ethernet PHY Status LEDs
X21971-112818
A separate discrete LED on top of the board (DS19, near item 38 in Figure 2) indicates link
established. Details about the tri-mode Ethernet MAC core are provided in the Tri-Mode Ethernet
MAC LogiCORE IP Product Guide (PG051). The TI DP83867ISRGZ data sheet is on the TI website.
I2C Bus, Topology, and Switches
[Figure 2, callout 25, 26]
The VCU128 evaluaon board I2C bus implementaon consists of I2C bus I2C0. The FPGA U1
HP bank 67 (VCCO VCC1V8) and system controller U42 bank 501 are wired to I2C0 via level-
shiers. I2C bus I2C0 is routed to a 1-to-4 channel TI PCA9544A bus switch U55 (address 0x75)
and a dual 8-bit port TI TCA6416A IO expander U65 (address 0x20). I2C bus I2C0 is also routed
to a pair of 1-to-8 channel TI TCA9548A bus switches U53 (address 0x74) and U54 (address
0x76). The bus switches can operate at speeds up to 400 kHz. The VCU128 evaluaon board
I2C0 I2C bus topology is shown in the following gures.
Chapter 3: Board Component Descriptions
UG1302 (v1.0) December 21, 2018 www.xilinx.com
VCU128 Board User Guide 72
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