PM73487 datasheet(17/251 Pages) PMC

17 / 251 page

PM73487 QRT

PMC-Sierra, Inc.

PMC-980618

Issue 3

622 Mbps ATM Traffic Management Device

Released

Datasheet

1.2

622 Mbps Switch Configuration

The QRT can be used in a stand-alone application that supports ATM switching up to 622 Mbps,

as shown in Figure 3. The four switch fabric interfaces are looped back to the QRT, allowing the

UTOPIA interface to be fully used. In this application, the QRT operates as an output buffered

switch..

Figure 2. QRT System Overview

Figure 3. 622 Mbps Switch Configuration

Physical and/or

ATM Layers

QRT

(PM73487)

QSE

(PM73488)

Input Cell

SDRAM

Output Cell

SDRAM

Multicast

SRAM

Receive

Receive Nibble Data

Transmit Nibble Data

Transmit Feedback

Receive UTOPIA Level 2

Interface

Transmit UTOPIA Level

2 Interface

Control

SSRAM

Cells are stored in per-

priority queues on the output

with per-VC accounting

Cells are stored in per-VC queues on

the input and respond to per-cell

AAL1 SAR

Processor

(PM73121)

S/UNI-QUAD

(PM5349)

QRT

(PM73487)

155M

UTOPIA Level 2 Multi-PHY Interface

PM73487 Datasheet(PDF) 17 Page - PMC-Sierra, Inc

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