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PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
PM7341 S/UNI-IMA-84
DATASHEET
PMC-2000223
ISSUE 4
INVERSE MULTIPLEXING OVER ATM
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
212
Register 0x182: TCAS Indirect Link Data Register
Bit
Type
Function
Default
15:9
Unused
X
8
R/W
PROV
0
7
Unused
X
6:0
R/W
VLINK[6:0]
0
The TCAS Timeslot Provision RAM maps Virtual Links to either timeslots in a
physical link or to an entire physical link. It also provisions timeslots.
This register contains either: (1) the data read from the TCAS Timeslot Provision
RAM after an indirect read operation or (2) the data to be inserted into the TCAS
Timeslot Provision RAM during an indirect write operation.
VLINK[6:0]
VLINK[6:0] is the Virtual Link from which this TCAS LINK/TSLOT is mapped.
Valid values are 0x00 to 0x53. For proper operation, timeslots from multiple
physical links cannot be mapped to the same VLINK.
After an indirect read operation has been completed, VLINK[6:0]) reports the
virtual link number read from the TCAS Timeslot Provision RAM. The Virtual
Link number to be written to the TCAS Timeslot Provision RAM in an indirect
write operation must be set up in this register before triggering the write.
VLINK[6:0] reflects the value written until the completion of a subsequent
indirect read operation.
PROV
The indirect provision enable bit (PROV) reports the timeslot provision enable
flag read from the timeslot provision RAM after an indirect read operation has
been completed. The provision enable flag to be written to the timeslot
provision RAM in an indirect write operation must be set up in this register
before triggering the write. When PROV is set high, the current time-slot is
assigned to the virtual link as indicated by VLINK[6:0]. When PROV is set low,
the time-slot does not belong to any virtual link. The transmit link data is set to
the contents of the Idle Time-slot Fill Data register. PROV reflects the last
value read or written until the completion of a subsequent indirect read
operation.