PEF2054 SIEMENS [Siemens Semiconductor Group], PEF2054 Datasheet - Page 95

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

programmed to the offset registers (OFD, OFU) given the desired bit number (BND,
BNU) to be marked. BPF denotes the actual number of bits constituting a frame.
Table 11
PCM Mode Offset Downstream, POFD, PCSR
0
1
2
Figure 25
PCM Interface Framing for PMOD:PSM = 1
The formulas given in table 11 and table 12 apply for calculating the values to be
Semiconductor Group
PFS
PDC
TxD#
TxD#
RxD#
RxD#
TxD#
TxD#
RxD#
RxD#
OFD9 … 2 = (BND – 17 + BPF)
OFD9 … 1 = (BND – 33 + BPF)
OFD9 … 0 = (BND – 65 + BPF)
1st Bit
1st Bit
1st Bit
1st Bit
1st Bit
2nd Bit
2nd Bit
1st Bit
1st Bit
2nd Bit 3rd Bit
2nd Bit
1st Bit
3rd Bit
3rd Bit
2nd Bit
3rd Bit
2nd Bit
2nd Bit
...
...
2nd Bit
...
...
...
...
3rd Bit
...
...
3rd Bit
3rd Bit
95
3rd Bit
mod BPF
mod BPF
mod BPF
...
...
...
Remarks
PCSR:OFD1 … 0 = 0
PCSR:OFD0 = 0
–
Conditions:
PMOD
PMOD PCR = 0,
PMOD :
PMOD :
PMOD :
PMOD :
PMOD
PMOD
PMOD
Application Hints
:
:
:
:
:
PSM
PCR
PCR = 0,
PCR
PCR
PCR = 1,
PCR
PCR = 1,
=
=
=
=
=
0,
0,
1
1,
1,
PEB 2055
PEF 2055
PCSR :
PCSR
PCSR
PCSR
PCSR
PCSR :
PCSR :
PCSR :
:
:
:
:
URE
URE = 0
DRE
DRE = 1
URE = 1
URE
DRE = 0
DRE
ITT08040
1 =
=
=
=
0
0
1