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On-board I2C devices are connected to the System Controller CPLD which acts as a I2C bus repeater for the Zynq SoC. System Controller CPLD signals X1, X3 and X7 are routed to Zynq SoC bank 34. Exact functionality depends on the System Controller CPLD firmware.
SoC to System Controller CPLD I2C bus
| Signal Name | SC CPLD Pin | SoC Pin | Notes |
|---|---|---|---|
| X1 | F1 | L16 | |
| X5 | J1 | P22 | |
| X7 | M1 | N22 |
I2C devices slave addressesDevices slave addresses are listed in the table below:
| I2C Device | I2C Address | IC | Notes |
|---|---|---|---|
| ISL12020M RTC | 0x6F | U20 | RTC registers. |
| ISL12020M SRAM | 0x57 | U20 | Battery backed RAM in RTC IC. |
| LSM303D | 0x1D | U22 | Optional, not soldered on current production variants. |
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