PM7347 datasheet(106/341 Pages) PMC

106 / 341 page

S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

106

Document ID: PMC-1990267, Issue 3

Bit

Type

Function

Default

Bit 7

R/W

FORM[1]

Bit 6

R/W

FORM[0]

Bit 5

R/W

M1TYPE

Bit 4

R/W

M2TYPE

Bit 3

R/W

FIXSTUFF

Bit 2

R/W

PLCPEN

Bit 1

Unused

Bit 0

R/W

EXT

The EXT bit disables the internal transmission system sublayer timeslot counter from

identifying DS1, DS3, E1, J2, E3 G.751, or E3 G.832 overhead bits. The EXT bit allows

transmission formats that are unsupported by the internal timeslot counter and must be

supported using the TIOHM input. When a logic zero is written to EXT, input transmission

system overhead (for DS1, DS3, E1, J2, E3 G.751, and E3 G.832 formats) is indicated using

the internal timeslot counter. This counter “flywheels” to create the appropriate transmission

system alignment. This alignment is indicated on the TOHM output. When a logic one is

written to EXT, indications on TIOHM identify each transmission system overhead bit. These

indications flow through the S/UNI-JET and appear on the TOHM output where they mark

the transmission system overhead placeholder positions in the TDATO stream. EXT should

only be set to logic one if the TFRM[1:0] bits in the S/UNI-JET Transmit Configuration

PLCPEN

The PLCPEN bit enables PLCP frame insertion. When a logic one is written to PLCPEN,

DS3, E3 G.751, DS1, or E1 PLCP framing is inserted. The PLCP format is specified by the

FORM[1:0] bits in this register. When a logic zero is written to PLCPEN, PLCP related

functions in the SPLT block are disabled. The PLCPEN bit must be set to logic zero for G.832

E3, J2, and arbitrary framing formats.

PM7347 Datasheet(PDF) 106 Page - PMC-Sierra, Inc

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