PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
Field (Bits)
Description
A cell was received while the SRTS queue was in underrun.
SRTS_UNDERRUN
(4)
RESUME
(3)
A resume has occurred: a valid cell was received and stored into the buffer. This cell will
be played out after 1 CDVT.
PTR_MISMATCH
(2)
A cell was dropped because of a pointer mismatch. This event causes a forced underrun
condition.
OVERRUN
(1)
A cell was dropped due to overrun. The receive buffer exceeded the maximum allowed
depth. This event causes a forced underrun condition.
UNDERRUN
(0)
A cell was received while the queue was in underrun.
R_TOT_SIZE Word Format
NOTE: This word is maintained by the microprocessor.
Field (Bits)
Description
Not used
(15:10)
Write with a 0 to maintain future software compatibility.
R_TOT_SIZE
(9:0)
Total number of bytes in the structure, minus one (for example, for an E1 SDF-MF VC
with two DS0s, R_TOT_SIZE is set to 32). This field is not used in UDF-ML or
UDF-HS mode.
Three formulas for R_TOT_SIZE are:
For T1/E1 SDF-FR:
R_TOT_SIZE = no. of DS0s − 1
For T1 SDF-MF and E1_W_T1_SIG:
(no. of DS0s + 1)
-------------------------------------------
R_TOT_SIZE = (24 × no. of DS0s ) +
For E1 SDF-MF:
R_TOT_SIZE =
– 1
– 1
2
(no. of DS0s + 1)
-------------------------------------------
(16 × no. of DS0s) +
2
R_DATA_LAST Word Format
NOTE: This word is maintained by the microprocessor.
Field (Bits)
Description
Write with a 0 to maintain future software compatibility.
Not used
(15:13)
LAST_CHAN
(12:8)
Channel number (0 to 31) of the last DS0 with a bit set in the R_CHAN_ALLOC bit
table (refer to “R_CHAN_ALLOC(15:0) Word Format” and “R_CHAN_
ALLOC(31:16) Word Format” on page 161). Not used in UDF-ML or UDF-HS modes.
Not used
(7:6)
Write with a 0 to maintain future software compatibility.
ꢀꢄꢈ
PMC [ PMC-SIERRA, INC ]
