PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Register 0x022: Receive UTOPIA Cell Available Enable
Bit
Type
Function
Default
15:4
3:0
Unused
RCAEN[3:0]
0
0
R/W
RCAEN[3:0]:
The RCAEN[3:0] is used to select which group of 8 addresses the S/UNI-IMA-
8 responds to. Only one bit should be set. RCAEN[0] corresponds to the
address range of 0 to 7 and RCAEN[3] corresponds to the address range of
24 to 30 (Since UTOPIA only supports 31 phys, if the highest range is chosen,
the S/UNI-IMA-8 will only support 7 ports.) If a disabled PHY address is
polled, RCA remains high impedance. Similarly, PHY selection is ignored and
no cell is transferred to the S/UNI-IMA-8 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
112
PMC [ PMC-SIERRA, INC ]
