PM7344 datasheet(141/293 Pages) PMC

141 / 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

125

Registers 027H, 127H, 227H and 327H: E1-FRMR Maintenance/Alarm Status

Bit

Type

Function

Default

Bit 7

RRA

Bit 6

Unused

Bit 5

AISD

Bit 4

Unused

Bit 3

RED

Bit 2

AIS

Bit 1

Unused

Bit 0

Unused

Reading these registers returns the current state value of the RRA, AISD, RED,

and AIS maintenance/alarm statuses.

RRA:

The RRA bit is a logic one when the "A" bit (bit 3 in time slot 0 of the non-

frame alignment signal frame) has been a logic one for 2 or 3 consecutive

non-frame alignment signal frames, as determined by the RADEB bit in the

E1-FRMR Maintenance Mode Options register.

AISD:

The AISD bit is a logic one after an unframed pattern of all ones with less

than 3 zeros in two consecutive frame times (512 bits) has been detected.

The AISD bit is updated every 512 bit times.

RED:

The RED bit is a logic one if an out of frame condition has persisted for 104

ms. The RED bit returns to a logic zero when a out of frame condition has

been absent for 104 ms.

AIS:

The AIS bit is a logic one when an unframed all-ones condition has persisted

for 104 ms. The AIS bit returns to a logic zero when the AIS condition has

been absent for 104 ms.

PM7344 Datasheet(PDF) 141 Page - PMC-Sierra, Inc

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