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PM73487 Datasheet(PDF) 32 Page - PMC-Sierra, Inc

Part # PM73487
Description  622 Mbps ATM Traffic Management Device
PDF  251 Pages
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Manufacturer  PMC [PMC-Sierra, Inc]
Direct Link  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM73487 Datasheet(HTML) 32 Page - PMC-Sierra, Inc

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PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
Released
Datasheet
20
2.4.2.1
UTOPIA Level 2 Polling
The UTOPIA interface offers three modes of polling, as per the UTOPIA Level 2 specification:
•
Standard single cell available polling
•
Multiplexed Status Polling (MSP) using four cell available signals
•
Direct status indication using four cell available signals
These polling modes allow the QRT to communicate with many different PHY devices. Figure 19
shows the QRT polling PHY devices in a receive UTOPIA operation.
Figure 20 shows the QRT polling PHY devices in a transmit UTOPIA operation.
Figure 19. Receive UTOPIA Operation
Figure 20. Transmit UTOPIA Operation
QRT
(PM73487)
To Switch Fabric
Data
Address
Cell Available
Serial In
Serial In
Serial In
PHY
Device
PHY
Device
QRT polls PHYs to determine if they have cells.
PHY
Device
QRT
(PM73487)
Data
Address
Cell Available
From Switch Fabric
Serial Out
Serial Out
Serial Out
PHY
Device
PHY
Device
PHY
Device
QRT polls PHYs to determine if they can accept cells.



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