CS4923/4/5/6/7/8/9
LRCLKN1—PCM Audio Input Sample Rate Clock: Pin 26
Bidirectional digital-audio frame clock that is an output in master mode and an input in slave
mode. LRCLKN1 typically is run at the sampling frequency. In slave mode, LRCLKN1
operates asynchronously from all other CS492X clocks. In master mode, LRCLKN1 is derived
from the CS492X internal clock generator. In either master or slave mode, the polarity of
LRCLKN1 for a particular subframe can be programmed by the DSP.
BIDIRECTIONAL - Default: INPUT
SDATAN1—PCM Audio Data Input Number One: Pin 22
Digital-audio data input that can accept from one to six channels of compressed or PCM data.
SDATAN1 can be sampled with either edge of SCLKN1, depending on how SCLKN1 has been
configured. INPUT
CMPCLK, SCLKN2—PCM Audio Input Bit Clock: Pin 28
Bidirectional digital-audio bit clock that is an output in master mode and an input in slave
mode. In slave mode, SCLKN2 operates asynchronously from all other CS492X clocks. In
master mode, SCLKN2 is derived from the CS492X internal clock generator. In either master
or slave mode, the active edge of SCLKN2 can be programmed by the DSP. If the CDI is
configured for bursty delivery, CMPCLK is an input used to sample CMPDAT.
BIDIRECTIONAL - Default: INPUT
CMPREQ, LRCLKN2—PCM Audio Input Sample Rate Clock: Pin 29
When the CDI is configured as a digital audio input, this pin serves as a bidirectional digital-
audio frame clock that is an output in master mode and an input in slave mode. LRCLKN2
typically is run at the sampling frequency. In slave mode, LRCLKN2 operates asynchronously
from all other CS492X clocks. In master mode, LRCLKN2 is derived from the CS492X
internal clock generator. In either master or slave mode, the polarity of LRCLKN2 for a
particular subframe can be programmed by the DSP. When the CDI is configured for bursty
delivery, or parallel audio data delivery is being used, CMPREQ is an output which serves as
an internal FIFO monitor. CMPREQ is an active low signal that indicates when another block
of data can be accepted. BIDIRECTIONAL - Default: INPUT
CMPDAT, SDATAN2—PCM Audio Data Input Number Two: Pin 27
Digital-audio data input that can accept from one to six channels of compressed or PCM data.
SDATAN2 can be sampled with either edge of SCLKN2, depending on how SCLKN2 has been
configured. Similarly CMPDAT is the compressed data input pin when the CDI is configured
for bursty delivery. When in this mode, the CS4923/4/5/6/7/8/9 internal PLL is driven by the
clock recovered from the incoming data stream. INPUT
DC—Reserved: Pin 38
This pin is reserved and should be pulled up with an external 4.7k resistor.
DD—Reserved: Pin 37
This pin is reserved and should be pulled up with an external 4.7k resistor.
DS262F2
53
CIRRUS [ CIRRUS LOGIC ]
