DSP56303 datasheet(136/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

7-4

Freescale Semiconductor

Enhanced Synchronous Serial Interface (ESSI)

output. If SC0 is used as the serial Output Flag 0, its value is determined by the value of the serial

Output Flag 0 (OF0) bit in the CRB. If SC0 is an input, it functions as either serial Input Flag 0 or

a receive shift register clock input. As serial Input Flag 0, SC0 controls the state of the serial Input

Flag 0 (IF0) bit in the ESSI Status Register (SSISR).

When SC0 is configured as a transmit data signal, it is always an output signal, regardless of the

SCD0 bit value. SC0 is fully synchronized with the other transmit data signals (STD and SC1). SC0

can be programmed as a GPIO signal (P0) when the ESSI SC0 function is not in use.

Note:

The ESSI can operate with more than one active transmitter only in Synchronous

mode.

7.2.5 Serial Control Signal (SC1)

ESSI0:SC01; ESSI1: SCI11

To determine the function of SC1, select either Synchronous or Asynchronous mode, according to

Table 7-2. In Asynchronous mode (as for a single codec with asynchronous transmit and

receive), SC1 is the receiver frame sync I/O. In Synchronous mode, SC1 is the transmitter data out

signal of transmit shift register TX2, for the transmitter 0 drive-enabled signal, or for serial flag

I/O. As serial flag I/O, SC1 operates like SC0. SC0 and SC1are independent flags but can be used

together for multiple serial device selection; they can be unencoded to select up to two CODECs

or decoded externally to select up to four CODECs. If SC1 is configured as a serial flag or receive

frame sync signal, the Serial Control Direction 1 CRB[SCD1] bit determines its direction.

Table 7-2. Mode and Signal Definitions

Control Bits

ESSI Signals

SYN

TE0

TE1

TE2

SC0

SC1

SC2

SCK

STD

SRD

RXC

FSR

FST

TXC

TD0

RXC

FSR

FST

TXC

TD0

F0/U

F1/T0D/U

F0/U

TD2

F0/U

TD2

TD1

F1/T0D/U

TD1

F1/T0D/U

TD1

TD2

TD1

TD2

F0/U

F1/T0D/U

TD0

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