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PAN9026 Wi-Fi/BT Module
4 Specification
Product Specification Rev. 0.1
Page 61
4.3.7 Audio Interface
The interface supports a PCM and a Marvell
®
proprietary TDM interface. Both
interfaces are muxed on the same pins.
4.3.7.1 PCM Interface
Interface Signals
Pin No
Signal Name
Specification
Name
Type
Description
A1 PCM_DOUT
DOUT
Output
PCM data
B1 PCM_CLK
CLK
Input/Output
PCM clock signal, output if PCM
master, input if PCM slave
B1 PCM_MCLK
MCLK
Output
PCM clock signal (optional),
optional clock used for some codecs,
derived from PCM_CLK
B2 PCM_DIN
DIN
Input
PCM data
B3 PCM_SYNC
SYNC
Input/Output
PCM Sync pulse signal, output if PCM
master, input if PCM slave
Modes of Operation
The PCM Interface supports two modes of operation:
•
PCM master
•
PCM slave
When in PCM master mode, the interface generates a 2 MHz or a 2.048 MHz PCM_CLK and a
8 kHz PCM_SYNC signal. An alternative PCM master mode is available that uses an externally
generated PCM_CLK, but still generates the 8 kHz PCM_SYNC. The external PCM_CLK must
have a frequency that is an integer multiple of 8 kHz. Supported frequencies are in the 512 kHz
to 4 MHz range.
When in PCM slave mode, the interface has both PCM_CLK and PCM_SYNC as inputs,
thereby letting another unit on the PCM bus generate the signals.
The PCM interface consists of up to four PCM slots (time-devided) preceded by a PCM sync
signal. Each PCM slot can be either 8 or 16 bits wide. The slots can be separated in time, but
they are not required to follow immediately after another. The timing is relative to PCM_SYNC.
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