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LZT 123 1836 52
For standard GSM voice a 13-Bit PCM data word is embedded in a 16-bit word frame,
as shown in Figure 5.10-1 below.
LSBMSB
D0
D15
13-bit sample occupies these frame bits
sample LSB justified
LSBMSB
D0
D15
13-bit sample occupies these frame bits
sample LSB justified
Figure 5.10-1 Typical 16-bit PCM Voice Sample Word Format
Typical PCM data transfer is shown in the following figures.
MSB
MSB
LSB
LSB
SSPCLK
SSPFS
SSPDFM
SSPDTM
Q
Q
MSB
MSB
LSB
LSB
SSPCLK
SSPFS
SSPDFM
SSPDTM
Q
Q
Figure 5.10-2 PCM Frame format for a single transfer
MSB
MSB
LSB
LSB
LSB
LSB
MSB
MSB
Frame nFrame n-1 Frame n+1
SSPCLK
SSPFS
SSPDFM
SSPDTM
MSB
MSB
LSB
LSB
LSB
LSB
MSB
MSB
Frame nFrame n-1 Frame n+1
SSPCLK
SSPFS
SSPDFM
SSPDTM
Figure 5.10-3 PCM Frame format for a continuous transfer