peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 159
peb20560
Manufacturer Part Number
peb20560
Description
Dsp Oriented Pbx Controller Doc
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB20560.pdf
(433 pages)
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When working in one of these modes the decoding of circular buffer write address is as
follows:
bit
bit
Index5…0
Bits 7:6
When working in one of these modes the decoding of circular buffer read address is as
follows:
Bits 7:6
The PEDIU gets only the 8 lsbs of the address (DXAP7…0). In order to access the
correct word in the circular buffer, the PEDIU converts the 7 lsbs of the address into an
8 bits address.
Circular-buffer converted write address in modes 3, 4:
bit
DSP
Bit 7 is ‘1’.
Circular-buffer converted read address in modes 3, 4:
bit
DSP
Circular-buffer converted read address in modes 3, 4:
Bit 7 is ‘0’.
Semiconductor Group
bit
bit
7
7
15
7
15
7
1
0
‘1’
‘1’
‘1’
‘0’
The stream0/1 field is not required here, because in modes 3 and 4 only
stream 0 (IN0 and OUT0) is active. Instead, the index field is 6 bits wide,
because each circular-buffer block is of 64 words in modes 3 and 4.
These are always ‘1’ during a write operation.
These are always ‘0’ during a write operation.
6
6
14
6
CB
14
6
CB
‘1’
‘1’
‘1’
‘0’
5
index(5) index(4) index(3) index(2) index(1) index(0)
5
index(5) index(4) index(3) index(2) index(1) index(0)
13
5
13
5
indeX
indeX
(5)
(5)
‘1’
‘1’
4
4
12
4
12
4
indeX
indeX
2-113
(4)
(4)
‘1’
‘1’
3
3
11
3
11
3
index
index
(3)
(3)
‘0’
‘0’
Functional Block Description
2
2
10
2
10
2
index
index
(2)
(2)
‘0’
‘0’
1
1
9
1
9
1
index
index
(1)
(1)
‘0’
‘0’
PEB 20560
0
0
8
0
8
0
index
index
2003-08
(0)
(0)
‘0’
‘0’
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