S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
RDAT Link Context Memory (MEM_SELECT=4)
Purpose: Contains IMA state information for each IMA Physical Link. For IMA connections,
RDAT uses this memory to maintain the IFSM, IESM, OSM, and the DCB write pointer for
each Physical Link. Note that for IMA links the group tag must be initialized prior to link
addition, with all other fields initialized to zero. For TC Links, this memory is used for the
external write pointer and should be initialized to zero.
Usage: IMA Groups and TC Links
Maintained by: RDAT.
Record Size: Two 32-bit words.
MEM_ADDR = (Physical Link Number x 2) + Word Offset
Table 26 RDAT Link Context Record
Word Bits
Parameter
lcd_latch
Description
0
31
Loss of Cell Delineation Defect latched status. This status is
maintained by the RDAT to report occurrences of LCD on
this link. This bit will be set when an LCD defect is detected
(as reported in the HEC field), and will be cleared by the
RDAT when a valid ICP cell is received. The bit may remain
set if the LCD condition persists.
30
29
overrun_latch
DCB Overrun latched status. This status is maintained by the
RDAT to report occurrences of DCB overrun. This bit will be
set when a DCB overrun is detected, and will be cleared by
the RDAT when a valid ICP cell is received. The bit may
remain set if the overrun condition persists.
DCB Underrun latched status. This status is maintained by
the RDAT to report occurrences of DCB underrun. This bit
will be set when a DCB underrun is detected (by the cell
reader process), and will be cleared by the RDAT when a
valid ICP cell is received. The bit may remain set if the
underrun condition re-occurs.
underrun_latch
28:25
24:15
14:13
Reserved
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
01
Reserved.
IMA Working. User cells may be written to the DCB.
OIF Anomaly. User cells are replaced with filler cells
in the DCB.
00
LIF Defect. User cells are replaced with filler cells in
the DCB.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
220
PMC [ PMC-SIERRA, INC ]
