S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
RDAT IMA Group Context Memory (MEM_SELECT=9)
Purpose: Contains state information for each IMA Group. VPHY_ID is the only field that must
be configured by PM (prior to IMA group startup).
Usage: IMA Groups only.
Maintained by: RDAT, PM
Record Size: Four 32-bit words.
MEM_ADDR = (Group Tag X 4) + Word Offset
Table 28 RDAT IMA Group Context Record
Word Bits
0 31:16
Parameter
vphy_id
Description
Virtual PHY ID.
For multi-channel UTOPIA mode, this identifies which channel
in the RXAPS FIFO cells received for this group will be written
to. The least significant 5 bits determine the destination
channel of the RXAPS FIFO for this IMA group, and the upper
11-bits are unused.
For Any-PHY mode and single channel UTOPIA, this identifies
the address that will be prepended to all cells as they are
written to the single channel RXAPS FIFO. For single channel
UTOPIA mode and Any-PHY mode, the least significant 7 bits
must uniquely identify a channel (legal values of 0-7 and the
upper 9 bits are user selectable.
15:0
Reserved.
1
31:13
12:0
Reserved.
read_ptr
Current read pointer for the delay compensation buffers
associated with this group. The most significant bits represent
an extension of the pointer, which is based on the IMA frame
sequence number. This field is initialized at link addition using
the DCB depth command (with the initiate bit set).
2
3
31:0
31:0
Reserved
Reserved
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
226
PMC [ PMC-SIERRA, INC ]
