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参数资料
| 型号： | DS21Q50LN |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 33/87页 |
| 文件大小： | 0K |
| 描述： | IC TRANSCEIVER E1 QD IND 100LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS |
| 产品变化通告： | Product Discontinuation 20/Feb/2012 |
| 标准包装： | 90 |
| 功能： | 收发器 |
| 接口： | E1 |
| 电路数： | 4 |
| 电源电压： | 3.14 V ~ 3.47 V |
| 电流 - 电源： | 230mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-LQFP |
| 供应商设备封装： | 100-LQFP（14x14） |
| 包装： | 托盘 |
| 包括： | AIS 警报检测器和发生器，回送功能，PRBS 发生器 / 检测器，远程检测器和发生器 |
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DS21Q50
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6. ERROR COUNT REGISTERS
A set of four counters in each transceiver of the DS21Q50 record bipolar (BPV) or code violations (CV),
errors in the CRC4 SMF codewords, E bits as reported by the far end, and word errors in the FAS. The E-
bit counter is reconfigured for counting errors in the PRBS pattern if receive PRBS is enabled. Each of
these four counters is automatically updated on either one-second boundaries (CCR2.70 = 0) or every
62.5ms (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 62.5ms. 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 62.5ms) to read the counters before the data is lost. The counters saturate at their respective maximum
counts and do not roll over.
6.1 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 BPVs or CVs. If CCR2.6 = 0, the VCR counts BPVs. BPVs are
defined as consecutive marks of the same polarity. In this mode, if the HDB3 mode is set for the receiver
through CCR1.2, HDB3 codewords are not counted as BPVs. If CCR2.6 = 1, the VCR counts CVs, as
defined in ITU O.161. CVs are defined as consecutive bipolar violations of the same polarity. In most
applications, the framer should be programmed to count BPVs when receiving AMI code and to count
CVs when receiving HDB3 code. This counter increments at all times and is not disabled by loss-of-sync
conditions. The counter saturates at 65,535 and does not roll over. The bit error rate on an E1 line would
have to be greater than 10-2 before the VCR would saturate.
Register Name:
VCR1, VCR2
Register Description:
Bipolar Violation Count Registers
Register Address:
00 Hex, 01 Hex
Bit
7
6
5
4
3
2
1
0
Name
V15
V14
V13
V12
V11
V10
V9
V8
Name
V7
V6
V5
V4
V3
V2
V1
V0
NAME
BIT
FUNCTION
V15
VCR1.7
MSB of the 16-bit code violation count
V0
VCR2.0
LSB of the 16-bit code violation count
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| DS21Q50LN+ | 功能描述:网络控制器与处理器 IC Quad E1 Transceiver 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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| DS21Q552 | 功能描述:网络控制器与处理器 IC 5V Quad T1 Transceiver 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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