PM7346 datasheet(82/419 Pages) PMC

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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 61

Bit #

1-8

...

761-768

769-776

777-784

785

786

787

788

789

Frm. 1

TS1[1:8]

...

TS96[1:8]

TS97[1:8]

TS98[1:8]

Frm. 2

TS1[1:8]

...

TS96[1:8]

TS97[1:8]

TS98[1:8]

Frm. 3

TS1[1:8]

...

TS96[1:8]

TS97[1:8]

TS98[1:8]

Frm. 4

TS1[1:8]

...

TS96[1:8]

TS97[1:8]

TS98[1:8]

TS1 .. TS96 :

Byte interleaved payload

TS97, TS98:

Reserved channels for signaling

Frame Alignment Signal:

represented as binary ones and zeroes

m :

4-kHz datalink

x1, x2, x3:

Spare bits, usually logic 1

a :

Remote Loss of Frame alarm bit, active high

e1..e5:

CRC-5 check sequence. The entire 3156-bit multiframe,

including

the CRC-5 check sequence, should have a remainder of 0

when

divided by x5 + x4 + x2 + 1

The J2-FRMR frames to a J2 signal with an average reframe time of 5.07 ms. An

alternate framing algorithm that uses the CRC-5 check to detect static mimic

patterns is available. Once in frame, the J2-FRMR provides indications of frame

and multiframe boundaries, and marks overhead bits, x-bits, m-bits, and reserved

channels (TS97 and TS98). Indications of loss of signal, bipolar violations,

excessive zeroes, change of frame alignment, framing errors, and CRC errors

are provided, and may be accumulated by the PMON (with the exception of

change of frame alignment); maskable interrupts are available to alert the

microprocessor to the occurrence of any of these events. In addition to marking

x-bit values, J2-FRMR provides microprocessor access to the x-bits, and will

optionally generate an interrupt when any of the x-bits changes state. The m-bits

and the associated clock are can either be extracted through the RDLC or

through the ROH[x] and ROHCLK[x] output pins of the S/UNI-QJET. The m-bits

are also presented to the RBOC for detection of any generic bit-oriented codes.

Status signals such as Physical AIS, Payload AIS, Remote Alarm Indication in

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