Table of Contents
Advertisement
Figure 11–34. Companding Data Formats
Figure 11–35. Transmit Data Companding Format in DXR
Table 11–13. Justification of Expanded Data in DRR
11.4.1 Companding Internal Data
LAW16
µ-Law
LAW16
A-law
31
Don't care
For reception, the 8-bit compressed data in RBR is expanded to a left-justified
16-bit data, LAW16. This can be further justified to a 32-bit data by programming
the RJUST field in the SPCR as shown in Table 11–13.
RJUST
If the McBSP is otherwise unused, the companding hardware can compand
internal data. This hardware can be used to:
Convert linear data to the appropriate µ-law or A-law format
Convert µ-law or A-law data to the linear format
Observe the quantization effects in companding by transmitting linear
data and compressing and re-expanding this data. This is useful only if
both XCOMPAND and RCOMPAND enable the same companding format.
µ -LAW/A-LAW Companding Hardware Operation
m-LAW/A-LAW Companding Hardware Operation
15
2
1
0
Value
15
3
2
Value
0
DXR bits
16
15
0
LAW16
DRR Bits
31
16
00
0
01
sign
10
LAW16
11
Reserved
Multichannel Buffered Serial Ports
0
0
15
0
LAW16
LAW16
0
11-51
Advertisement
Chapters
Table of Contents
