参数资料
型号: DS21FT44N+
厂商: Maxim Integrated Products
文件页数: 50/117页
文件大小: 0K
描述: IC FRAMER 4X4 16CH 300-BGA
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 40
控制器类型: E1 调帧器
接口: 并行/串行
电源电压: 2.97 V ~ 3.63 V
电流 - 电源: 225mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 300-BBGA
供应商设备封装: 300-PBGA(27x27)
包装: 管件
DS21FT44/DS21FF44
38 of 117
CCR2: COMMON CONTROL REGISTER 2 (Address = 1A Hex)
(MSB)
(LSB)
ECUS
VCRFS
AAIS
ARA
RSERC
LOTCMC
RFF
RFE
SYMBOL
POSITION
NAME AND DESCRIPTION
ECUS
CCR2.7
Error Counter Update Select. See Section 12 for details.
0 = update error counters once a second
1 = update error counters every 62.5ms (500 frames)
VCRFS
CCR2.6
VCR Function Select. See Section 12 for details.
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 one 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 (Figure 6–1).
0 = do not switch to RCLK if TCLK stops
1 = switch to RCLK if TCLK stops
RFF
CCR2.1
Receive Force Freeze. Freezes receive side signaling at RSIG
(and RSER if CCR3.3 = 1); will override Receive Freeze
Enable (RFE). See Section 14 or details.
0 = do not force a freeze event
1 = force a freeze event
RFE
CCR2.0
Receive Freeze Enable. See Section 14 for details.
0 = no freezing of receive signaling data will occur
1 = allow freezing of receive signaling data at RSIG (and
RSER if CCR3.3 = 1)
AUTOMATIC ALARM GENERATION
The DS21Q44 can be programmed to automatically transmit AIS or Remote Alarm. When automatic AIS
generation is enabled (CCR2.5 = 1), the framer monitors the receive side to determine if any of the
following conditions are present: loss of receive frame synchronization, AIS alarm (all one’s) reception,
or loss of receive carrier (or signal). If any one (or more) of the above conditions is present, then the
framer will transmit an AIS alarm.
When automatic RAI generation is enabled (CCR2.4 = 1), the framer monitors the receive side to
determine if any of the following conditions are present: loss of receive frame synchronization, AIS alarm
(all one’s) reception, loss of receive carrier or if CRC4 multiframe synchronization (if enabled) cannot be
found within 128ms of FAS synchronization. If any one (or more) of the above conditions is present, then
the framer will transmit a RAI alarm. RAI generation conforms to ETS 300 011 specifications and a
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