DSP56303 datasheet(137/292 Pages) FREESCALE

137 / 292 page

ESSI Data and Control Signals

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

7-5

When configured as an output, SC1 functions as a serial Output Flag, as the transmitter 0

drive-enabled signal, or as the receive frame sync signal output. If SC1 is used as serial Output

Flag 1, its value is determined by the value of the serial Output Flag 1 (OF1) bit in the CRB.

When configured as an input, this signal can receive frame sync signals from an external source,

or it acts as a serial input flag. As a serial input flag, SC1controls status bit IF1 in the SSISR.

When SC1 is configured as a transmit data signal, it is always an output signal, regardless of the

SCD1 bit value. As an output, it is fully synchronized with the other ESSI transmit data signals

(STD and SC0). SC1 can be programmed as a GPIO signal (P1) when the ESSI SC1 function is not

in use.

7.2.6 Serial Control Signal (SC2)

ESSI0:SC02; ESSI1:SC12

SC2

is a frame sync I/O signal for both the transmitter and receiver in Synchronous mode and for

the transmitter only in Asynchronous mode. The direction of this signal is determined by the

SCD2 bit in the CRB. When configured as an output, this signal outputs the internally generated

frame sync signal. When configured as an input, this signal receives an external frame sync signal

for the transmitter in Asynchronous mode and for both the transmitter and receiver when in

Synchronous mode. SC2 can be programmed as a GPIO signal (P2) when the ESSI SC2 function is

not in use.

F0/U

F1/T0D/U

TD0

F0/U

TD2

TD0

F0/U

TD2

TD0

TD1

F1/T0D/U

TD0

TD1

F1/T0D/U

TD0

TD1

TD2

TD0

TD1

TD2

TD0

TXC

Transmitter clock

RXC

Receiver clock

Transmitter/receiver clock (synchronous operation)

FST

Transmitter frame sync

FSR

Receiver frame sync

Transmitter/receiver frame sync (synchronous operation)

TD0

Transmit data signal 0

TD1

Transmit data signal 1

TD2

Transmit data signal 2

T0D

Transmitter 0 drive enable if SSC1 = 1 & SCD1 = 1

Receive data

Flag 0

Flag 1 if SSC1 = 0

Unused (can be used as GPIO signal)

Indeterminate

Table 7-2. Mode and Signal Definitions (Continued)

Control Bits

ESSI Signals

SYN

TE0

TE1

TE2

SC0

SC1

SC2

SCK

STD

SRD

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