![](http://datasheet.mmic.net.cn/330000/PM73123_datasheet_16444369/PM73123_226.png)
RELEASED
DATASHEET
PM73123 AAL1GATOR-8
ISSUE 2
PMC-2000097
8 LINK CES/DBCES AAL1 SAR
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL
226
Field (Bits)
Description
SRTS_UNDERRUN
(4)
RESUME
(3)
A cell was received while the SRTS queue was in
underrun.
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.
A cell was dropped because of a structure pointer
mismatch. This event causes a forced underrun
condition.
A cell was dropped due to overrun. The receive
buffer depth exceeded R_MAX_BUF. This event
causes a forced underrun condition.
A cell was received while the queue was in
underrun.
PTR_MISMATCH
(2)
OVERRUN
(1)
UNDERRUN
(0)
R_TOT_SIZE Word Format (09
H
)
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.
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:
R_TOT_SIZE
(9:0)
R_TOT_SIZE =
For E1 SDF-MF:
24
(
no. of DS0s
)
no. of DS0s
---------------------2
1
+
)
1
–
+
×
R_TOT_SIZE =
16
(
no. of DS0s
)
×
--no. of DS0s
1
+
)
2
1
–
+