- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1914 > DS2174QN+ (Maxim Integrated Products)IC BERT ENHANCED 44-PLCC PDF資料下載
參數(shù)資料
| 型號： | DS2174QN+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/24頁 |
| 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： | 增強型位誤碼率測試器（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： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 44-PLCC（16.59x16.59） |
| 包裝： | 管件 |
| 包括： | 錯誤計數(shù)器，樣式發(fā)生器和檢測器 |
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2175SN+ | IC ELASTIC STORE T1/CEPT 16-SOIC |
| DS2176QN | IC BUFFER RECEIVE T1 IND 28-PLCC |
| DS2180AQN+T&R | IC TRANSCEIVER T1 44-PLCC |
| DS2181AQN+ | IC TXRX CEPT PRIMARY RATE 44PLCC |
| DS2186S/T&R | IC TRANSMIT LINE INTERFC 20-SOIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2174QN/T&R+ | 制造商:Maxim Integrated Products 功能描述:BIT ERROR RATE TESTER 44PLCC - Tape and Reel |
| DS2174QN/T&R | 功能描述:電信集成電路 RoHS:否 制造商:STMicroelectronics 類型: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 |
| DS2174QN+ | 功能描述:電信集成電路 Enhanced Bit Error Rate Tester (BERT) RoHS:否 制造商:STMicroelectronics 類型: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 |
| DS2174QN+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 制造商:Maxim Integrated Products 功能描述:Telecom ICs Enhanced Bit Error Rate Tester (BERT) |
| DS2174QN+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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。