PM7340 Datasheet, PDF (265/334 Pages) PMC-Sierra, Inc – S/UNI INVERSE MULTIPLEXING FOR ATM, 8 LINKS

PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
PM7340 S/UNI-IMA-8
INVERSE MULTIPLEXING OVER ATM
OAM cells. Maintained by PM.
Transmit LID to Phsical Link Mapping Table Memory
The Transmit LID to Physical Link Mapping Table Memory contains the physical
link tag associated with each of the 32 possible link IDs within a particular group
of the 4 possible groups. Data is organized into a single linear table 128 7-bit
entries deep with each physical link ID stored as an 7 bit value. In general, this
table is sparsely populated since each of the 8 physical link tags can only exist in
one location throughout the entire table. Each entry is addressed by using the
group tag concatenated with the link ID (LID) as an index.
MEM_ADDR = (Group Tag X 32) + LID value
Table 33 Transmit LID to Physical Link Mapping Table
Bits Description
6:3 Reserved
2:0 Physical Link for corresponding Group Tag and Link ID.
Only values 0 to 7 are valid for this field.
Transmit Physical Link Context Table Memory
The Transmit Physical Link Context Table Memory contains state information and
statistics for each of the 8 possible physical links maintained by the transmit
engine. The memory locations associated with a particular link are used for
different purposes depending on whether a link is part of an IMA group or is,
instead, part of a TC mode connection. Data is organized into 8 records, one for
each of the maximum 8 links. Each record is 32 bits wide per word and 2-words
deep. Each record is addressed by either the TC tag delivered from the IDCC or
the physical link tag extracted from the Transmit LID to Physical Link mapping
table.
MEM_ADDR = (Physical Link Tag or TC Tag X 2) + Word Offset
Table 34 TIMA Physical Link Context Record
Word Bits Parameter
0
31:24 unused
Description
Unused
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 248