Serial Control Signal (Sc0); Serial Control Signal (Sc1) - Motorola DSP56303 User Manual

ESSI Data and Control Signals
7.2.4

Serial Control Signal (SC0)

ESSI0: SC00; ESSI1: SC10
To determine the function of the
mode, according to Table 7-2. In Asynchronous mode, this signal is used for the receive
clock I/O. In Synchronous mode, this signal is the transmitter data out signal for transmit shift
register TX1 or for serial flag I/O. A typical application of serial flag I/O would be multiple
device selection for addressing in codec systems.
If is configured as a serial flag signal or receive clock signal, its direction is determined
SC0
by the Serial Control Direction 0 (SCD0) bit in ESSI Control Register B (CRB). When
configured as an output,
register clock output. If
value of the serial Output Flag 0 (OF0) bit in the CRB. If
serial Input Flag 0 or a receive shift register clock input. As serial Input Flag 0,
the state of the serial Input Flag 0 (IF0) bit in the ESSI Status Register (SSISR).
When is configured as a transmit data signal, it is always an output signal, regardless of
SC0
the SCD0 bit value.
SC0
). can be programmed as a GPIO signal (
SC1 SC0
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
according to Table 7-2. In Asynchronous mode (as for a single codec with asynchronous
transmit and receive),
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,
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
is configured as a serial flag or receive frame sync signal, the Serial Control Direction 1
SC1
CRB[SCD1] bit determines its direction.
7-4
signal, select either Synchronous or Asynchronous
SC0
functions as the serial Output Flag 0 (OF0) or as a receive shift
SC0
is used as the serial Output Flag 0, its value is determined by the
SC0
is fully synchronized with the other transmit data signals (
, select either Synchronous or Asynchronous mode,
SC1
is the receiver frame sync I/O. In Synchronous mode,
SC1
DSP56303 User's Manual
is an input, it functions as either
SC0
) when the ESSI
P0
operates like
SC1 SC0
controls
SC0
and
STD
function is not in
SC0
is the
SC1
. and SC1are
SC0