参数资料
型号: DS21Q43AT
厂商: DALLAS SEMICONDUCTOR
元件分类: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PQFP128
封装: TQFP-128
文件页数: 13/60页
文件大小: 748K
代理商: DS21Q43AT
DS21Q43A
20 of 60
CCR2: COMMON CONTROL REGISTER 2 (Address=1A Hex)
(MSB)
(LSB)
ECUS
VCRFS
AAIS
ARA
RSERC
LOTCMC
-
SYMBOL
POSITION
NAME AND DESCRIPTION
ECUS
CCR2.7
Error Counter Update Select.
0=update error counters once a second
1=update error counters every 62.5 ms (500 frames)
VCRFS
CCR2.6
VCR Function Select.
0=count BiPolar Violations (BPVs)
1=count Code Violations (CVs)
AAIS
CCR2.5
Automatic AIS Generation.
0=disabled
1=enabled
ARA
CCR2.4
Automatic Remote Alarm Generation.
0=disabled
1=enabled
RSERC
CCR2.3
RSER Control.
0=allow RSER to output data as received under all conditions
1=force RSER to 1 under loss of frame alignment conditions
LOTCMC
CCR2.2
Loss of Transmit Clock Mux Control. Determines whether the
transmit side formatter should switch to the ever-present RCLK
if the TCLK should fail to transition (see Figure 1-1).
0=do not switch to RCLK if TCLK stops
1=switch to RCLK if TCLK stops
-
CCR2.1
Not Assigned. Should be set to 0 when written.
-
CCR2.0
Not Assigned. Should be set to 0 when written.
AUTOMATIC ALARM GENERATION
When either CCR2.4 or CCR2.5 is set to 1, the DS21Q43A monitors the receive side to determine if any
of the following conditions are present: loss of receive frame synchronization, AIS alarm (all 1s) re-
ception, or loss of receive carrier (or signal). If any one (or more) of the above conditions is present, then
the DS21Q43A will either force an AIS alarm (if CCR2.5=1) or a Remote Alarm (CCR2.4=1) to be
transmitted via the TPOS and TNEG pins. It is an illegal state to have both CCR2.4 and CCR2.5 set to 1
at the same time.
相关PDF资料
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