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CS62180B датащи(PDF) 28 Page - Cirrus Logic

номер детали CS62180B
подробное описание детали  T1 FRAMER
PDF  50 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS62180B датащи(HTML) 28 Page - Cirrus Logic

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is correct. Since the frame alignment is correct
no OOF event or auto resync occurs. A forced
resync will force the 62180B to synchronize to
the frame and multiframe alignment.
T1DM Resync
Resync is based upon the 6-bit sync word in
channel 24. Once the sync word is recognized,
6 consecutive frames with the correct sync word
and FS/FT bits are required before declaring syn-
chronization. RCR.2 must be set to "0". RCR.3
is ignored. When frame synchronization is de-
clared, RLOS goes low and RFSYNC is output
concurrent with the f-bits. However, the super-
frame output clocks (RMSYNC, RSIGFR and
RSIGSEL) are held low for an additional short
period of time until superframe synchronization
is found.
Receive Status Register (RSR)
The CS62180B monitors the incoming
T1 data for a number of error conditions.
These alarms are recorded in the Receive Status
Register (RSR), and output in real time on the
status pins: RYEL, RCL, RBV, RFER, and
RLOS. Three presettable counters are provided
which count the number of occurrences of Bipo-
lar Violations, Framing and CRC errors. The
Receive Interrupt Mask Register, RIMR, can be
set to specify which of the eight errors recorded
in the RSR will generate a hardware interrupt on
INT. When operating in hardware mode, all
these registers are cleared, and only the status
pins provide real time alarm information.
F
"0" "0" "0" "1"
Resync
F
Loss of Carrier
(32nd or 128th "0")
Resync
F
OOF
Loss of Carrier (RCL)
Bipolar Violation
CRC Error
RCLK
RSER
RMSYNC
RFSYNC
RFER
RBV
RCL
RLOS
Reframed
Errored F-bit
2nd Frame
Bipolar Violation
Figure 22. Receive Status Pin Timing
7
(MSB)
6
5
43210
(LSB)
BVCS
ECS
RYEL
RCL
FERR
B8ZSD
RBL
RLOS
1 =
BVCR
Saturation
ECR
Saturation
Yellow Alarm
Detected
Carrier Loss
Detected
Frame Error
Detected
B8ZS/COFA
Detected
Blue Alarm
Detected
Resync in
progress
Figure 21. Receive Status Register (RSR)
CS62180B
28
DS225PP2



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