PM5342 SPECTRA-155
DATA SHEET
PMC-970133
ISSUE 4
SONET/SDH PAYLOAD EXTRACTOR/ALIGNER
Register B6H, C6H, D6H: TPIP Pointer MSB
Bit
Type
R/W
R/W
R/W
R
R
R
R
R
Function
NDFPOR
EXTD
Reserved
CONCAT
S1
S0
PTR[9]
PTR[8]
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
X
X
X
X
X
This register reports the upper two bits of the active offset, the SS bits in the
receive pointer.
PTR[9:8]:
The PTR[9:8] bits contain the two MSBs of the current pointer value as
derived from the H1 and H2 bytes. Thus, to ensure reading a valid pointer,
the NDFI, NSEI and PSEI bits of the Pointer Interrupt Status register should
be read before and after reading this register to ensure that the pointer value
did not changed during the register read.
S0, S1:
The S0 and S1 bits contain the two S bits received in the last H1 byte. These
bits should be software debounced.
Reserved:
The Reserved bit must be set low for the correct operation of the SPECTRA-
155.
CONCAT:
The CONCAT bit is set high if the H1, H2 pointer byte received matches the
concatenation indication (one of the five NDF_enable patterns in the NDF
field, don't care in the size field, and all-ones in the pointer offset field).
EXTD:
The EXTD bit extends the TPIP registers to facilitate additional mapping. If
this bit is set to logic 1 the register mapping, for the TPIP Status and Control
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
265
PMC [ PMC-SIERRA, INC ]
