参数资料
型号: DS21Q44T+
厂商: Maxim Integrated Products
文件页数: 42/105页
文件大小: 0K
描述: IC FRAMER ENHANCED E1 4X 128TQFP
标准包装: 72
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: 75mA
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 128-LQFP
供应商设备封装: 128-LQFP(14x20)
包装: 管件
DS21Q44
41 of 105
IMR2: INTERRUPT MASK REGISTER 2 (Address=17 Hex)
(MSB)
(LSB)
RMF
RAF
TMF
SEC
TAF
LOTC
RCMF
TSLIP
SYMBOL
POSITION
NAME AND DESCRIPTION
RMF
IMR2.7
Receive CAS Multiframe.
0=interrupt masked
1=interrupt enabled
RAF
IMR2.6
Receive Align Frame.
0=interrupt masked
1=interrupt enabled
TMF
IMR2.5
Transmit Multiframe.
0=interrupt masked
1=interrupt enabled
SEC
IMR2.4
One Second Timer.
0=interrupt masked
1=interrupt enabled
TAF
IMR2.3
Transmit Align Frame.
0=interrupt masked
1=interrupt enabled
LOTC
IMR2.2
Loss Of Transmit Clock.
0=interrupt masked
1=interrupt enabled
RCMF
IMR2.1
Receive CRC4 Multiframe.
0=interrupt masked
1=interrupt enabled
TSLIP
IMR2.0
Transmit Side Elastic Store Slip Occurrence.
0=interrupt masked
1=interrupt enabled
8. ERROR COUNT REGISTERS
There are a set of four counters in each framer that record bipolar or code violations, errors in the CRC4
SMF code words, E bits as reported by the far end, and word errors in the FAS. Each of these four
counters are automatically updated on either one second boundaries (CCR2.7=0) or every 62.5 ms
(CCR2.7=1) as determined by the timer in Status Register 2 (SR2.4). Hence, these registers contain
performance data from either the previous second or the previous 62.5 ms. The user can use the interrupt
from the one second timer to determine when to read these registers. The user has a full second (or 62.5
ms) to read the counters before the data is lost. All four counters will saturate at their respective
maximum counts and they will not rollover.
BPV or Code Violation Counter
Violation Count Register 1 (VCR1) is the most significant word and VCR2 is the least significant word of
a 16–bit counter that records either BiPolar Violations (BPVs) or Code Violations (CVs). If CCR2.6=0,
then the VCR counts bipolar violations. Bipolar violations are defined as consecutive marks of the same
polarity. In this mode, if the HDB3 mode is set for the receive side via CCR1.2, then HDB3 code words
are not counted as BPVs. If CCR2.6=1, then the VCR counts code violations as defined in ITU O.161.
Code violations are defined as consecutive bipolar violations of the same polarity. In most applications,
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