S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
14.3.3 UTOPIA L2 Multi-PHY Receive Slave Interface
Figure 44 gives an example of the functional timing of the receive interface when configured as
a 31-port UTOPIA L2 compliant receive slave. The interface responds to addresses (as specified
by the register Receive Cell Available Enable) by asserting the RCA corresponding to the
addressed PHY when it is capable of providing a complete cell. As a result, the master selects
one of the S/UNI-IMA-4’s PHY’s by presenting the PHY address again during the last cycle
RENB is high. Had not the device been selected, RSOC, RDAT[m:0], and RPRTY would have
remained high-impedance.
Figure 44 illustrates that a cell transfer may be paused by deasserting RENB. The device is
reselected by presenting the PHY’s address the last cycle RENB is high to resume the transfer.
Figure 44 UTOPIA L2 Multi-PHY Receive Slave
1
2
3
4
5
6
7
8
9
10
Polling
Selection
RCLK
RADR[4:0]
1F
PHY-X
1F
PHY-Y
1F
PHY-X
1F
PHY-Z
1F
PHY-Z
1F
1 RCLK
PHY-X
1 RCLK
PHY-Y
1 RCLK
PHY-X
1 RCLK
PHY-Z
RCA
RDAT[m:0], RPRTY
RENB
PHY-Z
Data K-3
Data K-2
Data K-1
Data K
Data 0
Data 1
Data 2
Data K-1
RSOC
14.3.4 UTOPIA L2 single-PHY Receive Slave Interface
Figure 45 gives an example of the functional timing of the receive interface when configured as
a single port UTOPIA L2 compliant slave. The interface responds to the address that matches
the DEVID specified in the RXAPS Configuration register by asserting the RCA when it is
capable of providing a complete cell. As a result, the master selects the S/UNI-IMA-4 PHY’s by
presenting the PHY address again during the last cycle RENB is high. Had not the device been
selected, RSOC, RDAT[m:0], and RPRTY would have remained high-impedance.
Figure 45 illustrates that a cell transfer may be paused by deasserting RENB. The device is
reselected by presenting the PHY’s address the last cycle RENB is high to resume the transfer.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
299
PMC [ PMC-SIERRA, INC ]
