Cirrus Logic Crystal CS8427 Series Preliminary Product Information page 44

TCBL 15 Transmit Channel Status Block Start (Input/Output) - When operated as output, TCBL is high during
the first sub-frame of a transmitted channel status block, and low at all other times. When operated as
input, driving TCBL high for at least three OMCK clocks will cause the next transmitted sub-frame to be
the start of a channel status block.
OSCLK 16 Serial Audio Output Bit Clock (Input/Output) - Serial bit clock for audio data on the SDOUT pin
OLRCK 17 Serial Audio Output Left/Right Clock (Input/Output) - Word rate clock for the audio data on the
SDOUT pin. Frequency will be the output sample rate (Fs)
SDOUT 18 Serial Audio Output Data (Output) - Audio data serial output pin
19 Audio Channel Status Bit / V-Bit (Input/Output) - Reflects either the state of the audio/non audio Chan-
AUDIO/V
nel Status bit in the incoming AES3 data stream or is the V-bit data input for the AES3 transmitted data
stream, clocked by OLRCK.
PRO/C 20 PRO Channel Status Bit / C-Bit (Input/Output) - Reflects either the state of the Professional/Consumer
Channel Status bit in the incoming AES3 data stream or is the serial C-bit input for the AES3 transmitted
data, clocked by OLRCK.
APMS 21 Serial Audio Input Port Master/Slave Select (Input) - APMS should be connected to VD+ to set serial
audio input port as a master, or connected to DGND to set the port as a slave.
VD+ 23 Positive Digital Power (Input) - Typically +3 to +5V.
VD2+ 27
24 Hardware/Software Mode Control (Input) - Determines the method of controlling the operation of the
H/S
CS8427, and the method of accessing CS and U data. In software mode, device control and CS and U
data access is primarily via the control port, using a microcontroller. Hardware mode provides an alter-
nate mode of operation and access to the CS and U data via dedicated pins. This pin should be perma-
nently tied to VD+ or DGND
TXN 25 Differential Line Driver (Output) - Drivers transmit AES3 data and are pulled low while the CS8427 is in
TXN the reset state.
26
ORIG 28 ORIG Channel Status Bit (Output) - SCMS generation indicator. This is decoded from the incoming cat-
egory code and the L bit. A low output indicates that the audio data stream is 1st generation or higher. A
high indicates that the audio data stream is original. This is also a start-up option pin, and requires a pull-
up or pull-down resistor.
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CS8427
DS477PP1