PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
Field (Bits)
Description
NODROP_IN_START
(3)
In the “Fast SN Algorithm” for SN processing, the first cell received will
always be dropped because a sequence has not been established yet. This bit
disables the automatic dropping of cells while in the START state. Refer to
section 3.6 “Receive Adaptation Layer Processor (RALP)” starting on page 46
for more information.
0
When SN_STATE (refer to “SN_STATE” on page 155) equals
“000b”, any received cell will be dropped.
1
When SN_STATE (refer to “SN_STATE” on page 155) equals
“000b”, any received cell with valid SNP will be accepted.
MAX_INSERT
(2:0)
The maximum number of cells that will be inserted when cells are lost. If the
number of cells lost exceeds MAX_INSERT, then the queue will be forced
into underrun. If this value is set to 000b, it is interpreted the same as 111b,
which means that up to seven cells will be inserted.
R_CHAN_ALLOC(15:0) Word Format
Field (Bits)
Description
R_CHAN_ALLOC
(15:0)
A bit table with a bit set per DS0 allocated to this queue for DS0s 15 to 0 on
the line defined by queue ÷ 32. In UDF-ML and UDF-HS modes, initialize to
FFFFh. (DS0 15 is in bit 15).
R_CHAN_ALLOC(31:16) Word Format
Field (Bits)
Description
R_CHAN_ALLOC
(15:0)
A bit table with a bit set per DS0 allocated to this queue for DS0s 31 to 16 on
the line defined by queue ÷ 32. In UDF-ML and UDF-HS modes, initialize to
FFFFh. (DS0 31 is in bit 15).
R_DROPPED_CELLS Word Format
Field (Bits)
Description
R_DROPPED_CELLS
(15:0)
16-bit rollover count of dropped non-OAM cells. Initialize to 0. Once
initialized, do not write to this word. Cells may be dropped due to:
• Pointer mismatch.
• Overrun.
• Blank allocation table (refer to “R_CHAN_ALLOC(15:0) Word For-
mat” on page 161).
• SN processing.
• Structured cell received while in underrun but structure start has not
been found yet.
ꢀꢅꢀ
PMC [ PMC-SIERRA, INC ]
