I2C0 (Mio 14-15) - Xilinx ZCU111 User Manual

I2C0 (MIO 14-15)

[Figure 2-1, callout 13]
The I2C bus I2C0 connects the RFSoC U1 PS bank 500, PL bank 64, and the system controller
U42 to a GPIO 16-bit port expander (TCA6416A U22) and I2C switch (PCA9544A U23). The
port expander enables controlling resets and power system enable pins, and accepting
various alarm inputs without requiring the PL-side to be configured. The I2C0 bus also
provides access to the PMBus power controllers and the INA226 power monitors via the
U23 PCA9544A switch. TCA6416A U22 is pin-strapped to respond to I2C address 0x20. The
PCA9544A U23 switch is set to 0x75.
The devices on each port of the I2C0 U22 TCA6416A port expander are listed in
and the devices on each bus of the I2C0 U23 PCA9544A switch are listed in
Figure 3-3 shows a high-level view of the I2C0 bus connectivity represented in
and Table 3-5.
X-Ref Target - Figure 3-3
U1
BANK 500
PS I2C0
MIO15/
MIO14
U1
BANK 64
PL I2C0
AW16/AT16
U42
MPS430
ZCU111 Board User Guide
UG1271 (v1.1) August 6, 2018
U19
I2C0_SDA/SCL
L/S
U20
L/S
22 P3_0
23 P3_1
Figure 3-3: I2C0 Bus Topology
www.xilinx.com
Chapter 3: Board Component Descriptions
U22
TCA6416A
P00 MAX6643_OT_B
P01 MAX6643_FANFAIL_B
P02 MI026_PMU_INPUT_LS
P04 SFP28_SI5328_INT_ALM
P05 IIC_MUX_RESET_B
P06 GEM3_EXP_RESET_B
SDA/
SCL
P10 FMC_HSPC_PRSNT_M2C_B
P11 CLK_SPI_MUX_SEL0
P12 CLK_SPI_MUX_SEL1
P16 IRPS5401_ALERT_B
P17 INA226_PMBUS_ALERT
0x20
U23
TCA6416A
INA226_PMBUS_SCA/SCL
SD0/SC0
Not Connected
SD1/SC1
SDA/
IRPS5401_PMBUS_SDA/SCL
SD2/SC2
SCL
SYSMON_SCA/SCL
SD3/SC3
0x75
Table 3-4,
Table 3-5.
Table 3-4
X20531-062118
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