PM5352 datasheet(38/77 Pages) PMC

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PM5352 S/UNI STAR

DATA SHEET

PMC-1990421

ISSUE 2

SATURN USER NETWORK INTERFACE 155 (STAR)

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

Pin Name

Type

No.

Function

PHY_OEN

Input

(ATM/

POS)

A19

The PHY Output Enable (PHY_OEN) signal

controls the operation of the system interface.

When set to logic zero, all System Interface outputs

are held tristate. When PHY_OEN is set to logic

one, the interface is enabled. PHY_OEN can be

overwritten by the PHY_EN Master System

Interface Configuration register bit. PHY_OEN and

PHY_EN are OR’ed together to enable the

interface.

When the S/UNI-STAR is the only PHY layer device

on the bus, PHY_OEN can safely be tied to logic

one. When the S/UNI-STAR shares the bus with

other devices, then PHY_OEN must be tied to logic

zero, and the PHY_EN register bit used to enable

the bus once its PHY_ADR[2:0] is programmed in

order to avoid conflicts.

6.4

Microprocessor Interface Signals

Pin Name

Type

No.

Function

CSB

Input

B11

The active-low chip select (CSB) signal is low

during S/UNI-STAR register accesses.

Note that when not being used, CSB must be tied

high. If CSB is not required (i.e., registers accesses

are controlled using the RDB and WRB signals

only), CSB must be connected to an inverted

version of the RSTB input.

RDB

Input

D11

The active-low read enable (RDB) signal is low

during S/UNI-STAR register read accesses. The

S/UNI-STAR drives the D[7:0] bus with the contents

of the addressed register while RDB and CSB are

low.

WRB

Input

A10

The active-low write strobe (WRB) signal is low

during a S/UNI-STAR register write accesses. The

D[7:0] bus contents are clocked into the addressed

PM5352 Datasheet(PDF) 38 Page - PMC-Sierra, Inc

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