3.12. Digital Audio Ports¶
| Pin | Signal | Description | type | I/O |
|---|---|---|---|---|
| 83 89 | SSI1_INT SSI2_INT | Interrupt | ||
| 84 90 | SSI1_RXD SSI2_RXD | Receive serial data | ||
| 85 91 | SSI1_TXD SSI2_TXD | Transmit serial data | ||
| 86 92 | SSI1_CLK SSI2_CLK | Serial clock | ||
| 87 93 | SSI1_FS SSI2_FS | Frame Sync | ||
| Module | Remark | |||
| TX28S, TX48 | Only one SSI port available, SSI2 pins are not connected. | |||
| TX28, TX28S | On this module the SSI is a half-duplex serial port. | |||
The SSI is a full-duplex, serial port that allows the chip to communicate with a variety of serial devices. These serial devices can be standard CODer-DECoder (CODECs), Digital Signal Processors (DSPs), microprocessors, peripherals, and popular industry audio CODECs that implement the inter-IC sound bus standard (I2S) standard.
SSI is typically used to transfer samples in a periodic manner. The SSI consists of independent transmitter and receiver sections with independent clock generation and frame synchronization.
Audio Codec example:
