PM7346 datasheet(130/419 Pages) PMC

130 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 109

Bit

Type

Function

Default

Bit 7

R/W

FORM[1]

Bit 6

R/W

FORM[0]

Bit 5

R/W

Reserved

Bit 4

R/W

Reserved

Bit 3

R/W

REFRAME

Bit 2

R/W

PLCPEN

Bit 1

Unused

Bit 0

R/W

EXT

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 to be supported using the ROHM[x] input. When a

logic 0 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 is synchronized to the transmission system

frame alignment using the ROHM[x] (for DS1 or E1 ATM direct-mapped

formats), or by the integral framer block (for the DS3, J2, E3 G.751, or E3

G.832 formats).

When a logic 1 is written to EXT, indications on ROHM[x] identify each

transmission system overhead bit.

PLCPEN:

The PLCPEN bit enables PLCP framing. When a logic 1 is written to

PLCPEN, PLCP framing is enabled. The PLCP format is specified by the

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

related functions in the SPLR block are disabled. PLCPEN must be

programmed to logic 0 for E3 G.832, J2, and arbitrary framing formats.

REFRAME:

The REFRAME bit is used to trigger reframing. When a logic 1 is written to

REFRAME, the S/UNI-QJET is forced out of PLCP frame and a new search

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