37.4 Signal Description
| Pin Name | Pin Description | Type |
|---|---|---|
| MCKn | Host Clock for Clock Unit n | Input/Output |
| SCKn | Serial Clock for Clock Unit n | Input/Output |
| FSn | I2S Word Select or TDM Frame Sync for Clock Unit n | Input/Output |
| SDO | Serial Data Output for Transmit Serializer | Output |
| SDI | Serial Data Input for Receive Serializer | Input |
CAUTION: I/Os for I²S peripheral
are grouped into I/O sets, listed in their `IOSET' column in the pinout tables.
For these peripherals, it is mandatory to use I/Os that belong to the same I/O set. The timings are not guaranteed when I/Os from different I/O sets are mixed. Refer to the Pinout and Packaging chapter to get IOSET definitions.