peb20550 Infineon Technologies Corporation, peb20550 Datasheet - Page 119
peb20550
Manufacturer Part Number
peb20550
Description
Extended Pcm Interface Controller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB20550.pdf
(269 pages)
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CFI Time Slot Adjustment and Bit Shift
If CBSR = 20
marks bit 7 of the CFI time slot called TSN according to the following formula:
CTAR:TSN6 … 0 = TSN + 2
e.g. CTAR must be set to 02
= 0). See examples.
Note that the value of TSN may not exceed the actual number of time slots per CFI
frame:
TSN = [ – 2; I – 3], I = total number of time slots per CFI frame
From the zero offset bit position (CBSR = 20
upstream) can be shifted by up to 5 bits to the left (within the time slot
number TSN programmed in CTAR) and by up to 2 bits to the right (within the previous
time slot N – 1) by programming the CBSR:CDS2 … 0 bits:
Table 18
CBSR:CDS2 … 0
000
001
010
011
100
101
110
111
The bit shift programmed to CBSR:CDS2 … 0 affects both the upstream and
downstream frame position in the same way.
If CBSR:CUS3 … 0 = 0000, the upstream frame is aligned to the downstream frame.
With CBSR:CUS3 … 0 = 0001 to 1111, the upstream CFI frame can be shifted relative
to the downstream frame by up to 15 bits to the left as indicated in figure 41.
Semiconductor Group
H
, the CFI framing signal (PFS if CMD1:CSS = 0 or FSC if CMD1:CSS = 1)
Time Slot #
TSN – 1
TSN – 1
TSN
TSN
TSN
TSN
TSN
TSN
H
if the framing signal should mark time slot 0, bit 7 (TS
119
Marked Bit #
1
0
7
6
5
4
3
2
H
) the CFI frame (downstream and
Bit Shift
2 bits to the right
1 bit to the right
no bit shift
1 bit to the left
2 bits to the left
3 bits to the left
4 bits to the left
5 bits to the left
Application Hints
PEB 2055
PEF 2055
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