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SECTION
ENHANCED SERIAL AUDIO
INTERFACE (ESAI)
10.1
INTRODUCTION
The Enhanced Serial Audio Interface (ESAI) provides a full-duplex serial port for serial
communication with a variety of serial devices including one or more industry-standard
codecs, other DSPs, microprocessors, and peripherals which implement the Motorola SPI
serial protocol. 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.
Note:
The DSP56367 has two ESAI modules. This section describes the ESAI, and
Section 11 describes the ESAI_1. The ESAI and ESAI_1 share 4 data pins. This is
described in the ESAI_1 section.
The ESAI block diagram is shown in Figure 10-1. The ESAI is named synchronous because
all serial transfers are synchronized to a clock. 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. This mode offers a subset of the SPI protocol.
MOTOROLA
10
DSP56367
10-1
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