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PM7324

SATURN USER NETWORK INTERFACE ATM LAYER SOLUTION

PMC-Sierra 

S/UNI-ATLAS

DATASHEET

PMC-1971154

ISSUE 7

7

PIN DESCRIPTION

PM7324 S/UNI-ATLAS

S/UNI-ATM LAYER SOLUTION

Pin Name

Type

Pin Function

No.

Ingress Input Cell Interface:

RFCLK

Input

RPOLL

Input

RSOC

Input

28 pins

U3 The Ingress Input Cell Interface clock (RFCLK) is used to read

words from the PHY receive side into the S/UNI-ATLAS Ingress

Input Cell Interface. RFCLK must cycle at a 52 MHz or lower

instantaneous rate. RSOC, RCA[4:1], RPRTY and RDAT[15:0]

are sampled on the rising edge of RFCLK. RRDENB[4:1],

RADDR[4:0] and RAVALID are updated on the rising edge of

RFCLK.

U4 The Ingress Input Cell Interface Poll pin (RPOLL) is used to

control whether the Ingress Input Cell Interface operates in SCI-

PHY Level 1 mode or SCI-PHY Level 2 mode. If RPOLL is low,

the Ingress Input Cell Interface operates in SCI-PHY Level 1

mode (compatible with UTOPIA Level 1 cell-level handshaking).

This is a direct addressing mode using the RCA[4:1] inputs and

the RRDENB[4:1] outputs. If RPOLL is high, the Ingress Input

Cell Interface operates in a SCI-PHY Level 2 mode (compatible

with UTOPIA Level 2). This is a polled addressing mode using

the RADDR[4:0], RAVALID and RRDENB[1] outputs, and the

RCA[1] input. If fewer than 32 PHY devices are used, the

RAVALID pin need not be connected.

Note: In direct addressing mode, the 4-PHY configuration is not

recommended. Instead the 4-PHY address-polling mode should

be used. This does not apply to the Single or Dual-PHY

configurations.

RPOLL is assumed to be a static input.

V2 The Ingress Input Cell Interface Start of Cell (RSOC) marks the

start of the cell on the RDAT[15:0] bus. When RSOC is high, the

first word of the cell structure is present on the RDAT[15:0]

stream. It is not necessary for RSOC to be asserted for each

cell. An interrupt may be generated if RSOC is high during any

word other than the first word of the cell structure.

RSOC is sampled on the rising edge of RFCLK and considered

valid only when one of the RRDENB[4:1] signals so indicates.

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC AND FOR ITS CUSTOMERS’ INTERNAL USE 11

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