PM6388 datasheet(60/345 Pages) PMC

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PM6388 EOCTL

DATA SHEET

PMC-1971019

ISSUE 6

OCTAL E1 FRAMER

PROPRIETARY and CONFIDENTIAL to PMC-Sierra Inc. and for its customers’ internal use

ingress direction, then the elastic store is used to buffer between the ingress and

egress clocks to facilitate per-channel loopback.

Figure 7

- Clock Master: NxTS.

FRMR

Framer:

Frame

Alignment,

Alarm

Extraction

BRIF

Ingress

Interface

ID[1:8]

ICLK[1:8]

IFP[1:8]

RLCLK[1:8]

RLD[1:8]

RJAT

Digital Jitter

Attenuator

RECEIVER

ID[x], IFP[x]

Timed to

gapped ICLK[x]

In this mode, ICLK[x] is derived from RLCLK[x], and is gapped on a per channel

(timeslot TS) basis so that a subset of the 32 channels in the E1 frame is extracted

on ID[x]. Channel extraction is controlled by the RPSC block. The number of

ICLK[x] pulses is controllable from 0 to 256 pulses per frame on a per-channel

basis. In this mode, data passes through the EOCTL unchanged during out-of-

frame conditions. The parity functions are not usable in NxTS mode. When the

EOCTL is the clock master in the ingress direction, then the elastic store is used to

buffer between the ingress and egress clocks to facilitate per-channel loopback.

Figure 8

- Clock Slave: ICLK Reference

FRMR

Framer:

Frame

Alignment,

Alarm

Extraction

ELST

Elastic

Store

BRIF

Ingress

Interface

ID[1:8]

ICLK[1:8]

IFP[1:8]

RLCLK[1:8]

RLD[1:8]

CIFP

CICLK

RJAT

Digital Jitter

Attenuator

RECEIVER

ID[x], IFP[x]

Timed to CICLK

In this mode, the elastic store is enabled to permit CICLK to specify the ingress-side

timing. The ingress data on ID[x] is bit aligned to the 2.048 MHz common ingress

clock (CICLK) and is frame aligned to the common ingress frame pulse (CIFP).

ICLK[x] can be enabled to be either a 2.048 MHz jitter attenuated version of

RLCLK[x] or an 8 kHz version of RLCLK[x] (by dividing RLCLK[x] by 256). IFP[x]

indicates either the frame, signaling multiframe, CRC multiframe, or both signaling

and CRC multiframe alignment of ID[x].

PM6388 Datasheet(PDF) 60 Page - PMC-Sierra, Inc

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