PM7344 datasheet(39/293 Pages) PMC

39 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

Pin Name

Type

No.

Function

TDN[4]

TDN[3]

TDN[2]

TDN[1]/

Output

Transmit Digital Negative Line Pulse (TDN).

This signal is available on the pin when the

S/UNI-MPH is configured to transmit dual-rail

data. The TDN signal can be formatted for

either RZ or NRZ waveforms, and can be

enabled to be updated on the rising or falling

edge of TCLKO. When configured for single-rail

T1 or E1 data, TDN is unused.

TOHO[4]

TOHO[3]

TOHO[2]

TOHO[1]

Transmit Overhead Mask Output (TOHO).

When the S/UNI-MPH is configured to bypass

the T1/E1 transmit framers, this signal indicates

the placeholder bit positions for the framing

overhead in the transmit stream. TOHO may be

connected to an external framer device to

provide a user network interface for arbitrary bit

rates or for the J2 rate (for which TOHO is

specially conditioned to operate with the

Transwitch JT2F framer). The ATM cell stream

can be configured to be byte aligned to TOHO

(in which case the number of TCLKO periods

between active TOHO edges must be divisible

by eight). TOHO may be configured to be active

high or active low, and may be enabled to be

updated on the rising or falling edge of TCLKO.

TCLKI

Input

107

Transmit Clock Input (TCLKI). This signal

provides the transmit direction timing (when the

S/UNI-MPH is not loop timed). The S/UNI-MPH

may be configured to ignore the TCLKI input

and utilize XCLK instead. The default

requirement is for TCLKI to be a 1.544 MHz

clock for T1 or a 2.048 MHz clock for E1. For

arbitrary bit rates, TCLKI must be less than or

equal to 25 MHz.

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