PM7347 datasheet(141/341 Pages) PMC

141 / 341 page

S/UNI®-JET Data Sheet

Released

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

141

Document ID: PMC-1990267, Issue 3

Bit

Type

Function

Default

Bit 7

Unused

Bit 6

Unused

Bit 5

R/W

Reserved

Bit 4

R/W

UNI

Bit 3

R/W

FORMAT[1]

Bit 2

R/W

FORMAT[0]

Bit 1

R/W

REFRDIS

Bit 0

R/W

REFR

A transition from logic zero to logic one in the REFR bit position forces the E3 Framer to

initiate a search for frame alignment. The bit must be cleared to logic zero, then set to logic

one again to initiate subsequent searches for frame alignment.

REFRDIS

The REFRDIS bit disables reframing under the consecutive framing bit error condition once

frame alignment has been found, leaving reframing to be initiated only by software via the

REFR bit. A logic one in the REFRDIS bit position causes the FRMR to remain "locked in

frame" once initial frame alignment has been found. A logic zero allows reframing to occur

when four consecutive framing patterns are received in error.

FORMAT[1:0]

The FORMAT[1:0] bits determine the framing mode used for pattern matching when finding

frame alignment and for generating the output status signals. The FORMAT[1:0] bits select

one of two framing formats. Refer to Table 16.

Table 16 E3 FRMR FORMAT[1:0] Configurations

FORMAT[1]

FORMAT[0]

Framing Format Selected

G.751 E3 format

G.832 E3 format

Reserved

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