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参数资料
| 型号： | DS2174QN+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC BERT ENHANCED 44-PLCC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 500 |
| 功能： | 增强型位误码率测试器（EBERT） |
| 接口： | E1，J1，T1 |
| 电路数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 50mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC（16.59x16.59） |
| 包装： | 带卷 (TR) |
| 包括： | 错误计数器，样式发生器和检测器 |
DS2174
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4. RAM ACCESS
4.1 Indirect Addressing
512 bytes of memory, which is addressed indirectly, are available for repetitive patterns. Data bytes are
loaded one at a time into the indirect address register at address 0Fh. The RAM mode control bit, CR4.3,
determines the access to the RAM. If CR4.3 = 0, the RAM is under control of the BERT state machine. If
CR4.3 = 1, the RAM is under the control of the parallel port. This section discusses CR4.3 = 1.
The accompanying flow chart describes the algorithm used to write repetitive patterns to the RAM. The
programmer initializes a counter (n) to -1 in software, then sets CR4.3 and clears CR4.4. The rising edge
of CR4.3 resets the RAM address pointer to address 00h. Address 0Fh becomes the indirect access port to
the RAM. A write cycle on the parallel port to address 0Fh writes to the address in RAM pointed to by
the address pointer. The end of the write cycle, rising edge of WR, increments the address pointer. The
programmer then increments the counter (n) by 1 and loops until the pattern load is complete. Clear
CR4.3 to return control of the RAM to the BERT state machine. Finally, write the value in the counter (n)
back to address 04h and 05h to mark the last address of the pattern in memory.
The RAM contents can be verified by executing the same algorithm, replacing the parallel-port write with
a read, and setting CR4.4. CR4.3 must remain set for the entire algorithm to properly increment the
address pointer.
YES
WRITE n TO CR3
LAST BYTE?
DONE
CR4.3=1
CR4.4=0
n = -1
WRITE BYTE TO ADDRESS
0Fh
CR4.3 = 0
n = n + 1
START
NO
IF n > 255, THEN
SET CR4.0
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| DS2175 | 功能描述:网络控制器与处理器 IC T1/CEPT Elastic Store 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 |
| DS2175+ | 功能描述:网络控制器与处理器 IC T1/CEPT Elastic Store 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 |
| DS2175N | 功能描述:网络控制器与处理器 IC T1/CEPT Elastic Store 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 |
| DS2175S | 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 |
| DS2175S/T&R | 制造商:Maxim Integrated Products 功能描述:ELASTIC STORE-SOIC-TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC ELASTIC STORE T1/CEPT 16-SOIC 制造商:Maxim Integrated Products 功能描述:Network Controller & Processor ICs T1/CEPT Elastic Store |
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