RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
Field (Bits)
Description
SRTS_UNDERRUN
A cell was received while the SRTS queue was in
underrun.
(4)
RESUME
(3)
A resume has occurred: a valid cell was received
and stored into the buffer. The data carried in this
cell will be played out after R_CDVT frames.
PTR_MISMATCH
(2)
A cell was dropped because of a structure pointer
mismatch. This event causes a forced underrun
condition.
OVERRUN
(1)
A cell was dropped due to overrun. The receive
buffer depth exceeded R_MAX_BUF. This event
causes a forced underrun condition.
UNDERRUN
(0)
A cell was received while the queue was in
underrun.
R_TOT_SIZE Word Format (09H)
This word is maintained by the microprocessor
Field (Bits)
Description
FRAMES_PER_CELL
(15:10)
Average number of frames contained within a single
cell. This field is used only if DBCES_EN =1 or
BITI_UNDERRUN=1.
R_TOT_SIZE
(9:0)
Total bytes minus one in the structure (for example,
for an E1 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 DS0– - 1
For T1 SDF-MF or E1 with T1 Signaling:
no. of DS0s + 1
(
)
24 no. of DS0s + -------------------------------------------- – 1
×
)
R_TOT_SIZE = (
For E1 SDF-MF:
2
no. of DS0s + 1
(
)
16 no. of DS0s + ------------------------------------------- – 1
×
)
R_TOT_SIZE = (
2
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