VCU1525 Acceleration Platform User Guide
35
UG1268 (v1.0) November 13, 2017
Chapter 3:
Board Component Descriptions
lists the I2C address of the PCA9546 U28 bus switch target devices.
MSP432 user applications that communicate with devices on one of the downstream I2C
buses must first set up a path to the desired target bus through the U56 bus switch at I2C
address 0x75 (
0b1110101
).
VCU1525 U56 PCA9546 bus switch hosts three NXP SE98ATP thermal sensors plus a TI
PCA9536 4-bit port expander and an 8-Kbit M24C08 EEPROM on the IIC_SDA/SCL_EEPROM
channel 1 I2C bus. Also, channel 2 supports four DDR4 DIMM sockets on the
DDR4_SDA/SCL bus.
Table 3-5:
I2C_FPGA_SDA/SCL I2C Bus Addresses (FPGA U13 only)
I2C Bus
I2C Switch Position
I2C Address
Device
Binary Format Hex Format
PCA9546 4-channel bus switch
Not applicable
0b1110100
0x74
U28 PCA9546
QSFP0_I2C_SDA/SCL
0
0b1010000
0x50
J7 QSFP0
QSFP1_I2C_SDA/SCL
1
0b1010000
0x50
J9 QSFP1
USER_SI570_CLOCK_SDA/SCL
2
0b1011101
0x5D
U14 SI570
USER_SI570_CLOCK_SDA/SCL
2
0b1010100
0x54
U62 M24C08
SYSMON_SDA/SCL
3
0b0110010
0x32
U13 BANK 65
Notes:
1. SYSMON_SDA/SCL I2C bus is level-shifted to 1.2V by Q31/Q30.
