
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATMTraffic Management Device
Released
Datasheet
22
2.4.2.1.2
Multiplexed Status Polling (MSP) Using Four Cell Available Signals
With MSP using four cell available signals, up to four cell available responses occur every two
clocks. The advantage offered by the MSP mode is the improved response time for PHY service
selection. With this method, it is possible to poll 31 devices in a single cell time. PHY devices,
however, must comply with this optional part of the UTOPIA Level 2 specification. A standard
PHY device can be configured to use this mode even though it does not support it directly. To
effect this, up to eight PHY devices can be configured with the addresses 0, 4, 8, 12, 16, 20, 24,
and 28. Figure 23 shows the receive UTOPIA 50 MHz MSP, including cell transfer.
Figure 24 shows the transmit UTOPIA 50 MHz MSP including cell transfer.
Figure 23. Receive UTOPIA Multiplexed Status Polling (MSP), Including Cell Transfer
Figure 24. Transmit UTOPIA 50 MHz Multiplexed Status Polling (MSP), Including Cell Transfer
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02
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0C
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0
3
ATM_CLK
RATM_DATA(15:0)
RATM_ADD(4:0)
/RATM_READ_EN
RATM_CLAV(3:0)
RATM_SOC
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00 1F
1F
1F
00
04
1F
1F
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0C
10
14
1F
1F
1F
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1C
1F
01
0
F
0
F
0
8
F
h
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1F
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0
ATM_CLK
TATM_DATA(15:0)
TATM_ADD(4:0)
/TATM_WRITE_EN
TATM_CLAV(3:0)
TATM_SOC
TATM_PARITY