PM7346 datasheet(204/419 Pages) PMC

204 / 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 183

Bit

Type

Function

Default

Bit 7

Unused

Bit 6

R/W

UNI

Bit 5

R/W

REFRAME

Bit 4

R/W

FLOCK

Bit 3

R/W

CRC_REFR

Bit 2

R/W

SFRME

Bit 1

R/W

LOSTHR[1]

Bit 0

R/W

LOSTHR[0]

UNI:

When the UNI bit is set to logic 0, the J2-FRMR expects unipolar data on the

RDATI input and line code violation indications on the RLCV input. When UNI

is logic 0, the J2-FRMR expects bipolar B8ZS encoded data on the RPOS

and RNEG inputs. When UNI is set to logic 1, then the LOS, LOSI, and EXZI

indications cannot be used.

REFRAME:

Writing the REFRAME bit logic 1 forces the J2-FRMR to declare loss of

frame, and begin searching for a new alignment. In order to force another

reframe, REFRAME must be written with logic 0, and then logic 1 again.

FLOCK:

When the FLOCK bit is set to logic 1, the J2-FRMR is prevented from

declaring Loss of Frame and searching for a new frame alignment due to

framing-pattern errors. In this case, the J2-FRMR will only search for frame

alignment when the REFRAME register bit transitions from logic 0 to logic 1.

CRC_REFR

When the CRC Reframe Enable bit is set to logic 1, an alternate framing

algorithm is enabled, which uses the CRC-5 check to detect framing to a

mimic pattern in the payload or signaling bits. The framer, once it has seen at

least one correct framing pattern, begins looking for correct CRC-5s as well.

If it observes three consecutive correct framing patterns, and two correct

CRC-5 sequences, then frame is declared. Otherwise, a reframe is initiated.

PM7346 Datasheet(PDF) 204 Page - PMC-Sierra, Inc

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