PEF20550HV2.1XT Infineon Technologies, PEF20550HV2.1XT Datasheet - Page 228
PEF20550HV2.1XT
Manufacturer Part Number
PEF20550HV2.1XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.PEF20550HV2.1XT.pdf
(407 pages)
Specifications of PEF20550HV2.1XT
Lead Free Status / Rohs Status
Compliant
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marks bit 7 of the CFI timeslot called TSN according to the following formula:
CTAR:TSN6 … 0 = TSN + 2
e.g. CTAR must be set to 02
See examples.
Note that the value of TSN may not exceed the actual number of timeslots per CFI frame:
TSN = [ – 2; I – 3], I = total number of timeslots 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 timeslot
number TSN programmed in CTAR) and by up to 2 bits to the right (within the previous
timeslot N – 1) by programming the CBSR:CDS2 … 0 bits:
Table 34
CFI Shift with Respect to the Frame Synchronization Signal
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 77.
CFI Timeslot Adjustment and Bit Shift
If CBSR = 20
Semiconductor Group
H
, the CFI framing signal (PFS if CMD1:CSS = 0 or FSC if CMD1:CSS = 1)
Timeslot #
TSN – 1
TSN – 1
TSN
TSN
TSN
TSN
TSN
TSN
H
if the framing signal should mark timeslot 0, bit 7 (TS = 0).
228
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 20550
PEF 20550
01.96
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