PM7367 datasheet(134/323 Pages) PMC

134 / 323 page

PM7367 FREEDM-32P32

DATA SHEET

PMC-1991499

ISSUE 2

FRAME ENGINE AND DATA LINK MANAGER

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

120

CEN:

The channelise enable bit (CEN) configures the corresponding receive link for

channelised operation. RCLK[n] is held quiescent during the T1 framing bit

and during the E1 framing bytes. The data bit on RD[n] clocked in by the first

rising edge of RCLK[n] after an extended quiescent period is considered to

be the most significant bit of time-slot 1. When CEN is set low, receive link

#n is unchannelised. The E1 register bit is ignored. RCLK[n] is gapped

during non-data bytes. The choice between treating all data bits as a

contiguous stream with arbitrary byte alignment or byte aligned to gaps in

RCLK[n] is controlled by the BSYNC bit.

E1:

The E1 frame structure select bit (E1) configures the corresponding receive

link for channelised E1 operation when CEN is set high. RCLK[n] is held

quiescent during the FAS and NFAS framing bytes. The data bit on RD[n]

associated with the first rising edge of RCLK[n] after an extended quiescent

period is considered to be the most significant bit of time-slot 1. Link data is

present at time-slots 1 to 31. When E1 is set low and CEN is set high, the

corresponding receive link is configured for channelised T1 operation.

RCLK[n] is held quiescent during the framing bit. The data bit on RD[n]

associated with the first rising edge of RCLK[n] after an extended quiescent

period is considered to be the most significant bit of time-slot 1. Link data is

present at time-slots 1 to 24. E1 is ignored when CEN is set low.

BSYNC:

The byte synchronisation enable bit (BSYNC) controls the interpretation of

gaps in RCLK[n] when the corresponding link is in unchannelised mode (CEN

set low). When BSYNC is set high, the data bit on RD[n] clocked in by the

first rising edge of RCLK[n] after an extended quiescent period is considered

to be the most significant bit of a data byte. When BSYNC is set low, gaps in

RCLK[n] carry no special significance. BSYNC is ignore when CEN is set

high.

PM7367 датащи(PDF) 134 Page - PMC-Sierra, Inc