Sai Transmit Section; Table 2-9 Serial Audio Interface (Sai) Transmit Signals - Motorola DSP56012 User Manual

2.8.2

SAI Transmit Section

The transmit section of the SAI has five dedicated signals.

Table 2-9 Serial Audio Interface (SAI) Transmit Signals

Signal Signal
Name Type
SDO0 Output
SDO1 Output
SDO2 Output
SCKT Input
or
Output
WST Input
or
Output
MOTOROLA
State
during
Reset
Driven Serial Data Output 0—SDO0 is the transmitter 0 serial output.
high SDO0 is driven high if transmitter 0 is disabled, during
personal reset, hardware reset and software reset, or when the
chip is in the Stop state.
Driven Serial Data Output 1—SDO1 is the transmitter 1 serial output.
high SDO1 is driven high if transmitter 1 is disabled, during
personal reset, hardware reset and software reset, or when the
chip is in the Stop state.
Driven Serial Data Output 2—SDO2 is the transmitter 2 serial output.
high SDO2 is driven high if transmitter 2 is disabled, during
personal reset, hardware reset and software reset, or when the
chip is in the Stop state.
Tri-stated Transmit Serial Clock—This signal provides the clock for the
Serial Audio Interface (SAI). The SCKT signal can be an output
if the transmit section is programmed as a master, or a
Schmitt-trigger input if the transmit section is programmed as
a slave. When the SCKT is an output, it provides an internally
generated SAI transmit clock to external circuitry. When the
SCKT is an input, it allows external circuitry to clock data out
of the SAI.
SCKT is tri-stated if all transmitters are disabled (personal
reset), during hardware reset, software reset, or while the chip
is in the Stop state. No external pull-up is necessary.
Tri-stated Transmit Word Select—WST is an output if the transmit
section is programmed as a master, and a Schmitt-trigger input
if programmed as a slave. WST is used to synchronize the data
word and select the left/right portion of the data sample.
WST is tri-stated if all transmitters are disabled (personal
reset), during hardware or software reset, or while the chip is
in the Stop state. No external pull-up is necessary.
DSP56012 User's Manual
Signal Descriptions
Serial Audio Interface (SAI)
Signal Description
2-17