Freescale Semiconductor DSP56366 - Manual (Page 50)

Enhanced Serial Audio Interface
DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
2-16 Freescale Semiconductor
FST Input or output GPIO
disconnected
Frame Sync for Transmitter — This is the transmitter frame sync
input/output signal. For synchronous mode, this signal is the frame sync
for both transmitters and receivers. For asynchronous mode, FST is the
frame sync for the transmitters only. The direction is determined by the
transmitter frame sync direction (TFSD) bit in the ESAI transmit clock
control register (TCCR).
PC4 Input, output, or
disconnected
Port C 4 — When the ESAI is configured as GPIO, this signal is
individually programmable as input, output, or internally disconnected.
The default state after reset is GPIO disconnected.
This input is 5 V tolerant.
SCKR Input or output GPIO
disconnected
Receiver Serial Clock — SCKR provides the receiver serial bit clock for
the ESAI. The SCKR operates as a clock input or output used by all the
enabled receivers in the asynchronous mode (SYN=0), or as serial flag
0 pin in the synchronous mode (SYN=1).
When this pin is configured as serial flag pin, its direction is determined
by the RCKD bit in the RCCR register. When configured as the output
flag OF0, this pin will reflect the value of the OF0 bit in the SAICR
register, and the data in the OF0 bit will show up at the pin synchronized
to the frame sync in normal mode or the slot in network mode. When
configured as the input flag IF0, the data value at the pin will be stored
in the IF0 bit in the SAISR register, synchronized by the frame sync in
normal mode or the slot in network mode.
PC0 Input, output, or
disconnected
Port C 0 — When the ESAI is configured as GPIO, this signal is
individually programmable as input, output, or internally disconnected.
The default state after reset is GPIO disconnected.
This input is 5 V tolerant.
SCKT Input or output GPIO
disconnected
Transmitter Serial Clock — This signal provides the serial bit rate clock
for the ESAI. SCKT is a clock input or output used by all enabled
transmitters and receivers in synchronous mode, or by all enabled
transmitters in asynchronous mode.
PC3 Input, output, or
disconnected
Port C 3 — When the ESAI is configured as GPIO, this signal is
individually programmable as input, output, or internally disconnected.
The default state after reset is GPIO disconnected.
This input is 5 V tolerant.
Table 2-11 Enhanced Serial Audio Interface Signals (continued)
Signal Name Signal Type
State during
Reset
Signal Description