PEF2054 SIEMENS [Siemens Semiconductor Group], PEF2054 Datasheet - Page 59

• Manufacturer Part Number: PEF2054
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Access in multiplexed P-interface mode:
CDS2..0
CUS3..0
4.2.2.5 Configurable Interface Bit Shift Register (CBSR)
Access in demultiplexed P-interface mode:
Reset value: 00
Semiconductor Group
bit 7
0
CFI Downstream bit Shift 2..0.
From the zero offset bit position (CBSR = 20
and upstream) can be shifted by up to 6 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 TSN – 1) by programming the CBSR:CDS2..0 bits:
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.
CFI Upstream bit Shift 3..0.
These bits shift the upstream CFI frame relative to the downstream frame by
up to 15 bits. For CUS3..0 = 0000, the upstream frame is aligned with the
downstream frame (no bit shift).
CDS2
H
CDS1
CDS0
Time Slot No.
TSN – 1
TSN – 1
TSN
TSN
TSN
TSN
TSN
TSN
59
CUS3
read/write
read/write
Detailed Register Description
H
CUS2
) the CFI frame (downstream
Bit No.
1
0
7
6
5
4
3
2
address: A
OMDR:RBS = 1
address: 34
CUS1
PEB 2055
PEF 2055
H
bit 0
H
CUS0