PM7344 datasheet(126/293 Pages) PMC

126 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

110

Registers 01CH, 11CH, 21CH and 31CH: T1-FRMR Configuration

Bit

Type

Function

Default

Bit 7

R/W

M2O[1]

Bit 6

R/W

M2O[0]

Bit 5

R/W

ESFFA

Bit 4

R/W

ESF

Bit 3

R/W

FMS1

Bit 2

R/W

FMS0

Bit 1

Unused

Bit 0

Unused

These registers select the framing format and the frame loss criteria used by the

T1-FRMR.

M2O[1:0]:

The M2O[1:0] bits select the ratio of errored to total framing bits before

declaring out of frame in SF and ESF framing formats.

M2O[1:0]

Framing bit error ratio to declare OOF

2 out of 4

2 out of 5

2 out of 6

Reserved

ESFFA:

The ESFFA bit selects one of two framing algorithms for ESF frame search in

the presence of mimic framing patterns in the incoming data. A logic 0 selects

the ESF algorithm where the T1-FRMR does not declare inframe while more

than one framing bit candidate is following the framing pattern in the incoming

data. A logic 1 selects the ESF algorithm where a CRC-6 calculation is

performed on each framing bit candidate, and is compared against the CRC

bits associated with the framing bit candidate to determine the most likely

framing bit position.

PM7344 Datasheet(PDF) 126 Page - PMC-Sierra, Inc

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