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Chapter 8
Enhanced Serial Audio Interface (ESAI)
8.1
Introduction
The Enhanced Serial Audio Interface (ESAI) provides a full-duplex serial port for serial communication with a variety of devices, including
industry-standard codecs, SPDIF transceivers, and other DSPs. The ESAI consists of independent transmitter and receiver sections, each
section with its own clock generator. It is a superset of the 56300 Family ESSI peripheral and of the 56000 Family SAI peripheral.
There are two independent and identical ESAIs in the DSP56374:ESAI and ESAI_1. For simplicity,
a single generic ESAI is described here.
The ESAI block diagram is shown in
Additional synchronization signals are used to delineate the word frames. The normal mode of operation is used to transfer data at a periodic
rate, one word per period. The network mode is similar in that it is also intended for periodic transfers; however, it supports up to 32 words
(time slots) per period. This mode can be used to build time division multiplexed (TDM) networks. In contrast, the on-demand mode is
intended for non-periodic transfers of data and to transfer data serially at high speed when the data becomes available.
Freescale Semiconductor
NOTE
Figure
8-1. The ESAI is named synchronous because all serial transfers are synchronized to a clock.
DSP56374 Users Guide, Rev. 1.2
Introduction
8-1
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