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参数资料
| 型号： | DS21FT40N |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Digital Transmission Controller |
| 英文描述： | DATACOM, FRAMER, PBGA300 |
| 封装： | BGA-300 |
| 文件页数： | 35/87页 |
| 文件大小： | 386K |
| 代理商： | DS21FT40N |
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DS21FT40
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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 will not rollover. The bit error rate on a E1 line would have to be
greater than 10** –2 before the VCR would saturate.
VCR1: UPPER BIPOLAR VIOLATION COUNT REGISTER 1 (Address=00 Hex)
VCR2: LOWER BIPOLAR VIOLATION COUNT REGISTER 2 (Address=01 Hex)
(MSB)
(LSB)
V15
V14
V13
V12
V11
V10
V9
V8
VCR1
V7
V6
V5
V4
V3
V2
V1
V0
VCR2
SYMBOLS
POSITION
NAME AND DESCRIPTION
V15
VCR1.7
MSB of the 16–bit code violation count
V0
VCR2.0
LSB of the 10–bit code violation count
CRC4 Error Counter CRC4 Count Register 1 (CRCCR1) is the most significant word and CRCCR2 is the
least significant word of a 10–bit counter that records word errors in the Cyclic Redundancy Check 4
(CRC4). Since the maximum CRC4 count in a one second period is 1000, this counter cannot saturate.
The counter is disabled during loss of sync at either the FAS or CRC4 level; it will continue to count if
loss of multiframe sync occurs at the CAS level.
CRCCR1: CRC4 COUNT REGISTER 1 (Address=02 Hex)
CRCCR2: CRC4 COUNT REGISTER 2 (Address=03 Hex)
(MSB)
(LSB)
(note 1)
CRC9
CRC8
CRCCR1
CRC7
CRC6
CRC5
CRC4
CRC3
CRC2
CRC1
CRC0
CRCCR2
SYMBOLS
POSITION
NAME AND DESCRIPTION
CRC9
CRCCR1.1
MSB of the 10–Bit CRC4 error count
CRC0
CRCCR2.0
LSB of the 10–Bit CRC4 error count
NOTE:
1. The upper 6 bits of CRCCR1 at address 02 are the most significant bits of the 12–bit FAS error
counter.
E–Bit Counter
E–bit Count Register 1 (EBCR1) is the most significant word and EBCR2 is the least significant word of
a 10–bit counter that records Far End Block Errors (FEBE) as reported in the first bit of frames 13 and 15
on E1 lines running with CRC4 multiframe. These count registers will increment once each time the
received E–bit is set to zero. Since the maximum E–bit count in a one second period is 1000, this counter
cannot saturate. The counter is disabled during loss of sync at either the FAS or CRC4 level; it will
continue to count if loss of multiframe sync occurs at the CAS level.
相关PDF资料 |
PDF描述 |
|---|---|
| DS21FT40 | DATACOM, FRAMER, PBGA300 |
| DS21FT42 | DATACOM, FRAMER, PBGA300 |
| DS21FT42N | DATACOM, FRAMER, PBGA300 |
| DS21FF42 | DATACOM, FRAMER, PBGA300 |
| DS21FF42N | DATACOM, FRAMER, PBGA300 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS21FT42 | 功能描述:网络控制器与处理器 IC 4x4 16/4x3 12 Chnl T1/T1 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 |
| DS21FT42N | 功能描述:网络控制器与处理器 IC 4x4 16/4x3 12 Chnl T1/T1 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 |
| DS21FT44 | 功能描述:网络控制器与处理器 IC 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 |
| DS21FT44+ | 功能描述:网络控制器与处理器 IC 4X3 E1 Framer E1 Framer 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 |
| DS21FT44N | 功能描述:网络控制器与处理器 IC 4x4 16/4x3 12 Chnl E1/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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