PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Word Bits
Parameter
Description
0
30:29 link_state
Link Data State. Valid only in IMA mode. This
state is reports the current state as set may by
the RIPP to determine how the RDAT should
handle incoming cells:
00
Disabled. Cells are read from the link
FIFOs and dropped.
01
IMA startup. All ICP cells are forwarded to
the RIPP via the ICP FIFO, but the IFSM is
not started and the delay compensation
buffers remain idle for this link.
10
11
IMA Monitor. The IFSM is enabled. ICP
cells are forwarded to the RIPP (all during
the IFSM HUNT state, just cells at the
expected ICP cell position during the
PRESYNC and SYNC states). No cells are
written to valid buffer locations in the DCB,
but the write pointers are incremented.
IMA Enabled. Same as IMA Monitor, except
that user and filler cells are written to the
DCB.
28:26
Reserved.
25:24 m
IMA frame length. The value is programmed by
the RIPP to allow the RDAT to perform the IFSM,
and to validate the value for M in the incoming
ICP cells.
00
01
10
11
32 cells
64 cells
128 cells
256 cells.
23:16 ima_id
IMA ID. This value is the group identifier, which is
programmed by the RIPP to allow the RDAT to
validate this value in the incoming ICP cells.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
223
PMC [ PMC-SIERRA, INC ]
