PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
TX_HEAD(1:2) Word Format
Field (Bits)
Description
TX_HEAD(1)
(15:8)
First header byte in bits 15:8. Initialize to the proper value.
TX_HEAD(2)
(7:0)
Second header byte in bits 7:0. Initialize to the proper value.
TX_HEAD(3:4) Word Format
Field (Bits)
Description
TX_HEAD(3)
(15:8)
Third header byte in bits 15:8. Initialize to the proper value.
TX_HEAD(4)
(7:0)
Fourth header byte in bits 7:0. Initialize to the proper value.
TX_HEAD(5) Word Format
Field (Bits)
Description
TX_HEAD(5)
(15:8)
Fifth header byte that contains the precalculated HEC word. Initialize to the proper
value.
Not used
(7:0)
Write with a 0 to maintain compatibility with future software versions.
QUE_CREDITS Word Format
Field (Bits)
Description
FRAME_REMAINDER
(15:14)
A 2-bit quantity representing the remainder of the division operation the CSD performs
when converting the frame differential (expressed in frames) to the frame differential
(expressed in eighths of multiframes). This quantity is maintained by the CSD. Initialize
to 00b.
Not used
(13:10)
Write with a 0 to maintain compatibility with future software versions.
QUEUE_CREDITS
(9:0)
A 10-bit quantity representing the number of credits(bytes) accumulated for the queue.
It is measured in eighths (three LSBs are fractional bits). Initialize to 47 × 8 (178h) for
UDF modes full cells and Single-DS0-no-pointer mode full cells, 46.875 × 8 (177h) for
SDF modes full cells, or to the partially filled cell length × 8.
ꢀꢂꢆ
PMC [ PMC-SIERRA, INC ]
