PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
Field (Bits)
Description
Reserved
(12:9)
Initialize to 0 to maintain future software compatibility.
R_END_UNDERRUN_PTR
(8:0)
Location read pointer needs to reach after an underrun to begin playing out
new data. Initialize to 0 to maintain future software compatibility.
R_MAX_BUF Word Format
NOTE: This word is maintained by the microprocessor.
Field (Bits)
Description
R_CHAN_UNSTRUCT
(15)
Set to 1 only when receiving cells with a single DS0 without a pointer in the SDF-FR
mode. This bit is valid only in SDF-FR mode. To conform to the CES standard V 2.0
(refer to Appendix B, “References”, on page 203) when using a single DS0 in SDF-FR
mode, no pointer should be used.
R_CHAN_NO_SIG
(14)
Set to 1 to receive cells without signaling when the line is in SDF-MF mode. This is the
same as using this queue in SDF-FR mode, which means that the structure forms on
frame boundaries instead of multiframe boundaries. The R_SIG_BUFFER will never
be updated for this queue. However, the TL_SIG output will drive the value that was
initialized into this timeslot in T_SIG_BUFFER.
R_CHAN_DISABLE
(13)
Set to 1 to drop all cells for this queue. Set to 0 for normal operation. Cells dropped
because of this bit are recorded in the ALLOC_TBL_BLANK sticky bit.
Not used
(12:9)
Write with 0 to maintain future software compatibility.
R_MAX_BUF
(8:0)
Receiver maximum buffer size. The R_MAX_BUF is coded as the number of frames.
In all structured modes, this is the number of frames. In all unstructured modes, this is
the number of 256-bit increments. If the amount of data in the receive buffer exceeds
R_MAX_BUF, no more data will be written, an overflow will be reported, and the
queue will be forced into underrun. The maximum value of R_MAX_BUF is 1FEh. R_
MAX_BUF should be set to at least 2 * R_CDVT, or R_CDVT + 2 * (number of
frames per cell), whichever is greater.
R_SEQUENCE_ERR Word Format
Field (Bits)
Description
R_SEQUENCE_ERR
(15:0)
16-bit rollover count of SN errors. This counter counts transitions from the
SYNC state to the OUT_OF_SEQUENCE state. This is the
atmfCESAal1SeqErrors count from the CES specification.
Note that if SN processing is disabled, this counter will count all
out-of-sequence cells. Initialize to 0. Once initialized, do not write to this
word.
ꢀꢄꢆ
PMC [ PMC-SIERRA, INC ]
