S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
Register 0x022: Receive UTOPIA Cell Available Enable
Bit
15:4
3:0
Type
Function
Unused
RCAEN[3:0]
Default
0
0
R/W
RCAEN[3:0]
The RCAEN[3:0] bits control the response to polling on the receive UTOPIA port when in
UTOPIA Level 2 Multi-Address mode. The RCAEN[3:0] bits can be used to select which
group of 8 addresses the S/UNI-IMA-4 responds to. Only one bit should be set; for
example, setting RCAEN[0] enables addresses 0 through 7 and setting RCAEN[3] enables
addresses 24 through 30. S/UNI-IMA-4 drives the RCA output signal either high or low,
when polled with an address corresponding to a set RCAEN bit, depending on the Group
FIFO status.
If a disabled PHY address is polled, RCA remains high impedance. Similarly, PHY
selection is ignored and no cell is transferred from the S/UNI-IMA-4 when a disabled PHY
is addressed. This is typically used to allow more than one slave device to share the Receive
UTOPIA bus. Disabling all traffic to the UTOPIA input port while in Multi-PHY mode is
achieved by setting all RCAEN[3:0] bits to logic 0. This field is ignored when in Any-PHY
or Single Port UTOPIA mode.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
111
PMC [ PMC-SIERRA, INC ]
