peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 156

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Semiconductor Group
• If the written data is a linear word which was generated by µ-law decoding, it will be
bit
• If the data bypassed the a-/µ-law to linear converter, it will be stored in the most
bit
The same rules are valid also when the PEDIU handles words, which were written to the
PEDIU RAM by the DSP.
Data should be stored in the following manner:
• Linear data which should be encoded according to a-law should be stored in the 13
bit
• Linear data which should be encoded according to µ-law should be stored in the
bit
• Data which should bypass the linear to a-/µ-law converter should be stored in the most
bit
2.8.5.3
As can be seen in Table 2-22 and in Figure 2-42, the block structure of the circular
buffer is different in each mode. Section 2.8.2.2 includes a description of which circular
buffer blocks the PEDIU should access to, and which blocks should be accessed by the
DSP, according to the mode and Current Block (CB) signal.
A special method is used to simplify the DSP access to the circular buffer, during regular
work of the PEDIU (when the PEDIU is active and in mode 0, 1, 2, 3 or 4). According to
stored in the 14 MSBs.The 2 lsbs will be ‘0’
significant byte (8 MSbs). The 8 lsbs will be ‘0’.
MSBs, by the DSP. The 3 lsbs should be “don’t care”.
14 MSBs.The 2 lsbs will be ‘0’
significant byte. The 8 lsbs are “don’t care”
15
15
15
15
15
14
14
14
14
14
The Circular Buffer Address Method
13
13
13
13
13
Bypass Data
Bypass Data
12
12
12
12
12
11
11
11
11
11
a-law 13 bit signed data
µ-law 14 bit signed data
µ-law 14 bit signed data
10
10
10
10
10
9
9
9
9
9
2-110
8
8
8
8
8
7
7
7
7
7
X
X
6
6
6
6
6
X
X
Functional Block Description
5
5
5
5
5
X
X
4
4
4
4
4
X
X
3
3
3
3
3
X
X
2
2
2
2
2
X
X
X
PEB 20560
1
1
1
1
1
X
X
X
X
0
2003-08
0
0
0
0
0
X
X
X
X
0