參數(shù)資料
型號(hào)： DS2174Q+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 0K
描述： IC BERT ENHANCED 44-PLCC
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 26
功能： 增強(qiáng)型位誤碼率測(cè)試器（EBERT）
接口： E1，J1，T1
電路數(shù)： 1
電源電壓： 3 V ~ 3.6 V
電流 - 電源： 50mA
工作溫度： 0°C ~ 70°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 44-LCC（J 形引線(xiàn)）
供應(yīng)商設(shè)備封裝： 44-PLCC（16.59x16.59）
包裝： 管件
包括： 錯(cuò)誤計(jì)數(shù)器，樣式發(fā)生器和檢測(cè)器
DS2174
18 of 24
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS2174Q/T&R+ 制造商:Maxim Integrated Products 功能描述:BIT ERROR RATE TESTER 44PLCC - Tape and Reel
DS2174Q/T&R 功能描述:電信集成電路 RoHS:否 制造商:STMicroelectronics 類(lèi)型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray
DS2174Q+ 功能描述:電信集成電路 Enhanced Bit Error Rate Tester (BERT) RoHS:否 制造商:STMicroelectronics 類(lèi)型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray
DS2174Q+T&R 制造商:Maxim Integrated Products 功能描述:BIT ERROR RATE TESTER 44PLCC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC BERT ENHANCED 44-PLCC
DS2174Q+T&R 功能描述:電信集成電路 Enhanced Bit Error Rate Tester (BERT) RoHS:否 制造商:STMicroelectronics 類(lèi)型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray
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