Figure 9: I2C1 Bus Topology
TCA9548A
SD0/SC0
SD1/SC1
SD2/SC2
SD3/SC3
SD4/SC5
SD5/SC5
SD6/SC6
SD7/SC7
IIC_EEPROM_SDA/SCL
S15381_SDA/SCL
USER_S1570__C0_SDA/SCL
USER_MGT_S1570_SDA/SCL
8A34001_SDA/SCL
CLK104_SDA/SCL
RFMC_I2C_SDA/SCL
Not Connected
SDA/SCL
BANK 500
PS I2C1
U1
MPS430
U38
P4_1
P4_2
L/S
U18
0x74
U20
I2C1_SDA/SCL
MIO17/
MIO16
TCA9548A
SD0/SC0
SD1/SC1
SD2/SC2
SD3/SC3
SD4/SC5
SD5/SC5
SD6/SC6
SD7/SC7
FMCP_HSPC_II_SDA/SCL
USER_SI570_PSREF_SDA/SCL
SYSMON_SDA/SCL
PS_DDR4_SODIMM_SDA/SCL
SFP3_IIC_SDA/SCL
SFP2_IIC_SDA/SCL
SFP1_IIC_SDA/SCL
SFP0_IIC_SDA/SCL
SDA/SCL
0x75
U22
X25700-111621
The addresses of each target device on the I2C1 U20 and U22 PCA9548A switches are
identified in the following tables.
Table 11: I2C1 TCA9548A U20 Target Device Addresses
TCA9548A U20 (Addr 0x74) Port
I2C1 Bus Device
Target Device Address
0
EEPROM U16
0X54
1
Si5341 Clock U43
0x76
2
USER SI5381A C0 Clock U47
0X5D
3
USER MGT Si570 Clock U48
0X5D
4
8A34001 (zSFP ClK Recovery) U409
0x5B
5
CLK104 Connector J101
0x2F
6
RFMC LPAF-50 Connector J82
USER
7
No Connection
NA
Chapter 3: Board Component Descriptions
UG1532 (v1.0) March 30, 2022
ZCU670 Board User Guide
32