Xilinx ZCU1285 User Manual page 51

• SuperClock-2 Module
• SuperClock-RF2 Module
• System Controller EEPROM
• FMC1 connector (not populated)
• FMC2 connector
• FMC3 connector
The following table lists the I2C channel assignments.
U22
Channel
0 RFSoC and serial transceiver regulators and power monitoring bus (PMBus)
1 SuperClock-2 Module
2 System Controller EEPROM
3 FMC1 (N/A)
4 FMC2
5 RF data converter regulators and power monitoring bus (PMBus)
6 SuperClock-RF2 Module
7 FMC3
The upstream port of the multiplexer connects to two pairs of PCA9306 bidirectional I2C/
PMBus level translators (U46, U53, U55, and U58 in the following figure). J121 and J125 (callout
13, Figure 2: Board Component
isolate the System Controller or the RFSoC I2C bus.
System Controller
RFSoC
UG1348 (v1.0) July 16, 2019
ZCU1285 Board User Guide
Locations) are used to enable or disable the bus repeaters and
Figure 18: I2C Bus Multiplexer and Upstream Repeater
PCA9306DCTR PCA9306DCTR
I2C Bus I2C Bus
UTIL_3V3
Repeater Repeater
1
Enable
U46, U53
2
3
Disable
J125
PCA9306DCTR PCA9306DCTR
I2C Bus
I2C Bus
UTIL_3V3
Repeater Repeater
1
Enable
U55, U58
2
3
Disable
J121
Chapter 1: ZCU1285 Board Features and Operation
I2C Component
TCA9548APWR
U22
Send Feedback
PL, PS, MGT PMBus
SuperClock-2 module
SYS_EEPROM
FMC1
FMC2
RF data converter PMBus
Analog Clock module
FMC3
X22900-060719
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