PM7347 datasheet(41/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

Document ID: PMC-1990267, Issue 3

Pin Name

Type

No.

Function

TICLK

Input

V15

The Transmit Input Clock (TICLK) provides the transmit

direction timing. TICLK is the externally generated

transmission system baud rate clock. It is internally

buffered to produce the transmit clock output, TCLK, and

can be enabled to update the TPOS/TDATO and

TNEG/TOHM outputs on the TICLK rising edge. The

TICLK maximum frequency is 52 MHz.

ROHFP

Output

The Receive DS3/E3/J2 Overhead Frame Position

(ROHFP) locates the individual overhead bits in the

received overhead data stream, ROH.

ROHFP is high during the X1 overhead bit position in the

ROH stream when processing a DS3 stream. ROHFP is

high during the first bit of the FA1 byte when processing

a G.832 E3 stream. ROHFP is high during the RAI

overhead bit position when processing a G.751 E3

stream. ROHFP is high during the first bit in Timeslot 97

in the first frame of the 4-frame multiframe when

processing a J2 stream.

ROHFP is updated on the falling edge of ROHCLK.

ROH

Output

The Receive DS3/E3/J2 Overhead Data (ROH) contains

the overhead bits (C, F, X, P, and M) extracted from the

received DS3 stream. It also contains the overhead bytes

(FA1, FA2, EM, TR, MA, NR, and GC) extracted from the

received G.832 E3 stream, the overhead bits (RAI,

National Use, Stuff Indication, and Stuff Opportunity)

extracted from the received G.751 E3 stream, and the

overhead bits (Framing, X1-3, A, M, E1-5) extracted from

the received J2 stream.

ROH is updated on the falling edge of ROHCLK.

ROHCLK

Output

The Receive DS3/E3/J2 Overhead Clock (ROHCLK) is

active when a DS3, E3, or J2 stream is being processed.

ROHCLK is nominally a 526 kHz clock when processing

DS3, a 1.072 MHz clock when processing G.832 E3, a

1.074 MHz clock when processing G.751 E3, and a

gapped 6.312 MHz clock with an average frequency of

168 kHz for J2.

ROH and ROHFP are updated on the falling edge of

ROHCLK.

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