PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Word Bits
Parameter
Description
14:13 iesm_state
IMA Error/Maintenance State. This state is
maintained by the RDAT to indicate the current
state in the IESM for this link.
11
10
Reserved.
IMA Working. User cells may be written to
the DCB.
01
00
OIF Anomaly. User cells are replaced with
filler cells in the DCB.
LIF Defect. User cells are replaced with
filler cells in the DCB.
12:10 oif_cnt
Count of the number of IMA frames while in the
Out of IMA Frame (OIF) anomaly. This value is
compared against gamma + 2 to detect the loss of
an IMA frame (LIF) Gamma is set in Register
0x308. Once the LIF condition has been detected,
this count is reset, and is used to count the
persistence of IMA Sync for 2 IMA frames.
9
last_cell_stuff
Active high bit indicating when the last cell
received on this link was a stuff cell (required for
proper IFSM processing).
8:2
1:0
Reserved.
group_tag
The group tag associated with this link. The value
is set by the read process; it is used by the cell
write process to retrieve the group read pointer, in
order to detect overrun conditions.
1
31
30
Reserved
Reserved
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
226
PMC [ PMC-SIERRA, INC ]
