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:

../../../_images/digital_audio_ports1.png