Confidential
MANUAL
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Revision
7/198 17-LXE 108 566 Uen
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2.3.7.1.1 Data
Format
The GM-41 module implements a 13-bit PCM with the 13-bit data embedded in a 16-bit word as follows. The output
data is compatible with the linear PCM data I/O of an industry standard Texas Instrument DSP. Each PCM word
shall contain 16-bits D0 - D15. D13 - D1 is the 2´s complement value of the 13-bit PCM, with D13 as the sign bit.
D14 and D15 are always set to be equivalent with D13, and D0 can contain an optional LSB if a 14-bit word is used.
D13 is the MSB while D1 is the LSB if a 14-bit word is not used. Note that the MSB is sent in first place.
Bit
Bit Designation
Contents
D15
MSB
Equal to D13
D14
-
Equal to D13
D13 - D1
-
Two's complement of 13-bit PCM
D0
LSB
Optional additional data
Table 23: PCM Data Word
Figure 9: PCM Data Word
D0
MSB D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1 LSB
= D13
13 bit PCM
16 bit data word