PM7346 datasheet(205/419 Pages) PMC

205 / 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 184

When CRC_REFR is set to logic 0, the framing algorithm simply searches for

three consecutive correct framing patterns.

SFRME

When the Single Framing Bit Error (SFRME) bit is set to logic 1, then the J2-

FRMR will indicate (to the PMON) a single framing error for every J2 multi-

frame which contains one or more framing errors. When the SFRME bit is set

to logic 0, the J2-FRMR will identify every framing error to the PMON.

LOSTHR[1:0]

The Loss of Signal Threshold bits select the number of consecutive zeroes

required before the J2-FRMR will declare Loss of Signal (LOS), and the

number of bit periods without an occurrence of excess zeroes that must pass

before the J2-FRMR will de-assert Loss of Signal. The thresholds are as

follows:

Table 14

- J2 FRMR LOS Threshold Configurations

LOSTHR[1]

LOSTHR[0]

Threshold

255

Thus, if LOSTHR[1:0] = 11 binary, LOS will be declared after the 255th

consecutive binary zero, and de-asserted when 255 bit periods have passed

without an occurrence of a string of eight or more consecutive zeroes.

PM7346 Datasheet(PDF) 205 Page - PMC-Sierra, Inc