PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
otherwise noted. Each record is 4 words deep by 32 bits wide, and is addressed
by the group tag.
MEM_ADDR = (Group Tag X 4) + Word Offset
Table 23
RDAT IMA Group Statistics Record
Word
Parameter
Description
0
atm_cells
Count of the number of cells that have been read
from the DCB and transferred to the ATM layer for
this group.
1
dropped_cells
Count of the number of cells which have been
dropped solely due to ATM layer congestion for
this group.
2
3
reserved
filler_cells
Count of the number of filler cells that have been
read from the DCB (and not transferred to the
ATM layer) for this group. Buffers that either: (1)
do not contain the correct link_sequence number
or pointer or (2) do not have the valid bit set −
these buffers will match this criteria. The cell
writer may mark cells in this manner for many
reasons; for example, when the link is not yet IMA
enabled.
RDAT TC Group Statistics Memory
The RDAT TC group statistics memory is maintained by the cell reader block; it
stores pertinent cell and event counts for up to 8 TC links. All counters roll over
unless otherwise noted. Each record is 2 words deep by 32 bits wide, and is
addressed by the TC tag.
MEM_ADDR = (TC Tag X 2) + Word Offset
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
221
PMC [ PMC-SIERRA, INC ]
