DSP56303 datasheet(133/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

7-1

Enhanced Synchronous Serial Interface

(ESSI)

The ESSI 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. The ESSI consists of independent transmitter and receiver sections and a common

ESSI clock generator. There are two independent and identical ESSIs in the DSP56303: ESSI0

and ESSI1. For simplicity, a single generic ESSI is described here. The ESSI block diagram is

shown in Figure 7-1. This interface is synchronous because all serial transfers are synchronized

to one clock.

This synchronous interface should not be confused with the asynchronous channels mode of the

ESSI, in which separate clocks are used for the receiver and transmitter. In that mode, the ESSI is

still a synchronous device because all transfers are synchronized to these clocks. Pin notations for

the generic ESSI refer to the analogous pin of ESSI0 (PCx) and ESSI1 (PDx).

Figure 7-1. ESSI Block Diagram

RSMA

RSMB

TSMA

TSMB

SSISR

RX SHIFT REG

TX0 SHIFT REG

TSR

RCLK

TX0

CRB

CRA

SRD

STD

TCLK

SC2

SCK

Clock/Frame Sync Generators and Control Logic

Interrupts

TX1 SHIFT REG

TX1

SC0

TX2 SHIFT

TX2

SC1

GDB

DDB

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