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参数资料
| 型号： | DS21Q42TN |
| 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： | 60/119页 |
| 文件大小： | 1309K |
| 代理商： | DS21Q42TN |
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DS21Q42
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8. ERROR COUNT REGISTERS
There are a set of three counters in each framer that record bipolar violations, excessive zeros, errors in
the CRC6 code words, framing bit errors, and number of multiframes that the device is out of receive
synchronization. Each of these three counters are automatically updated on either one second boundaries
(CCR3.2=0) or every 42 ms (CCR3.2=1) as determined by the timer in Status Register 2 (SR2.5). Hence,
these registers contain performance data from either the previous second or the previous 42 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 42 ms) to read the counters before the data is lost. All three counters will saturate at their
respective maximum counts and they will not rollover (note: only the Line Code Violation Count Register
has the potential to overflow but the bit error would have to exceed 10 -2 before this would occur).
Line Code Violation Count Register (LCVCR)
Line Code Violation Count Register 1 (LCVCR1) is the most significant word and LCVCR2 is the least
significant word of a 16–bit counter that records code violations (CVs). CVs are defined as Bipolar
Violations (BPVs) or excessive zeros. See Table 8-1 for details of exactly what the LCVCRs count. If the
B8ZS mode is set for the receive side via CCR2.2, then B8ZS code words are not counted. This counter is
always enabled; it is not disabled during receive loss of synchronization (RLOS=1) conditions.
LCVCR1: LINE CODE VIOLATION COUNT REGISTER 1 (Address = 23 Hex)
LCVCR2: LINE CODE VIOLATION COUNT REGISTER 2 (Address = 24 Hex)
(MSB)
(LSB)
LCV15
LCV14
LCV13
LCV12
LCV11
LCV10
LCV9
LCV8
LCVCR1
LCV7
LCV6
LCV5
LCV4
LCV3
LCV2
LCV1
LCV0
LCVCR2
SYMBOL
POSITION
NAME AND DESCRIPTION
LCV15
LCVCR1.7
MSB of the 16–bit code violation count
LCV0
LCVCR2.0
LSB of the 16–bit code violation count
LINE CODE VIOLATION COUNTING ARRANGEMENTS Table 8-1
COUNT EXCESSIVE
ZEROS?
(RCR1.7)
B8ZS ENABLED?
(CCR2.2)
WHAT IS COUNTED
IN THE LCVCRs
no
BPVs
yes
no
BPVs + 16 consecutive zeros
no
yes
BPVs (B8ZS code words not
counted)
yes
BPV’s + 8 consecutive zeros
相关PDF资料 |
PDF描述 |
|---|---|
| DS21Q42T | DATACOM, FRAMER, PQFP128 |
| DS21Q43AT | DATACOM, FRAMER, PQFP128 |
| DS21Q44T | DATACOM, FRAMER, PQFP128 |
| DS21Q44TN | DATACOM, FRAMER, PQFP128 |
| DS21Q48N | DATACOM, PCM TRANSCEIVER, PBGA144 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS21Q43A | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Quad E1 Framer |
| DS21Q43AT | 功能描述:网络控制器与处理器 IC Quad E1 Framer RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q43AT+ | 功能描述:网络控制器与处理器 IC Quad E1 Framer RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q43ATN | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Quad E1 Framer |
| DS21Q43-ATN | 功能描述:网络控制器与处理器 IC Quad E1 Framer RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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