Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
Cells are stored in per-VC queues on
the input and respond to per-cell
Multicast
SRAM
Input Cell
SDRAM
Receive UTOPIA Level 2
Interface
Receive
Receive Nibble Data
QSE
Control
SSRAM
Physical and/or
ATM Layers
QRT
(PM73487)
(PM73488)
Transmit Nibble Data
Transmit UTOPIA Level
2 Interface
Transmit Feedback
Output Cell
SDRAM
Cells are stored in per-
priority queues on the output
with per-VC accounting
Figure 2. QRT System Overview
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..
UTOPIA Level 2 Multi-PHY Interface
1
2M
AAL1 SAR
Processor
(PM73121)
8
2M
QRT
(PM73487)
1
4
155M
155M
S/UNI-QUAD
(PM5349)
Figure 3. 622 Mbps Switch Configuration
5
PMC [ PMC-SIERRA, INC ]
