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參數(shù)資料
| 型號： | DS21348T |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Digital Transmission Interface |
| 英文描述： | DATACOM, PCM TRANSCEIVER, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 28/67頁 |
| 文件大?。?/td> | 339K |
| 代理商： | DS21348T |
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DS21348/Q348
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8. DIAGNOSTICS
8.1
IN-BAND LOOP CODE GENERATION & DETECTION
The DS21348 has the ability to generate and detect a repeating bit pattern that is from one to eight or
sixteen bits in length. To transmit a pattern, the user will load the pattern to be sent into the Transmit
Code Definition (TCD1 and TCD2) registers and select the proper length of the pattern by setting the
TC0 and TC1 bits in the In-Band Code Control (IBCC) register. When generating a 1, 2, 4, 8, or 16 bit
pattern both the transmit code registers (TCD1 and TCD2) must be filled with the proper code.
Generation of a 1, 3, 5, or 7-bit pattern only requires TCD1 to be filled. Once this is accomplished, the
pattern will be transmitted as long as the TLCE control bit (CCR3.3) is enabled. As an example, if the
user wished to transmit the standard “l(fā)oop up” code for Channel Service Units which is a repeating
pattern of ...10000100001... then 80h would be loaded into TCD1 and the length would set using TC1 and
TC0 in the IBCC register to 5 bits.
The DS21348 can detect two separate repeating patterns to allow for both a “l(fā)oop up” code and a “l(fā)oop
down” code to be detected. The user will program the codes to be detected in the Receive Up Code
Definition (RUPCD1 and RUPCD2) registers and the Receive Down Code Definition (RDNCD1 and
RDNCD2) registers and the length of each pattern will be selected via the IBCC register. The DS21348
will detect repeating pattern codes with bit error rates as high as 1x10
-2. The code detector has a nominal
integration period of 48 ms, hence, after about 48 ms of receiving either code, the proper status bit (LUP
at SR.7 and LDN at SR.6) will be set to a one. Normally codes are sent for a period of 5 seconds. It is
recommended that the software poll the DS21348 every 100 ms to 1000 ms until 5 seconds has elapsed to
insure that the code is continuously present.
IBCC (0AH): IN–BAND CODE CONTROL REGISTER
(MSB)
(LSB)
TC1
TC0
RUP2
RUP1
RUP0
RDN2
RDN1
RDN0
SYMBOL
POSITION
NAME AND DESCRIPTION
TC1
IBCC.7
Transmit Code Length Definition Bit 1. See Table 8-1
TC0
IBCC.6
Transmit Code Length Definition Bit 0. See Table 8-1
RUP2
IBCC.5
Receive Up Code Length Definition Bit 2. See Table 8-2
RUP1
IBCC.4
Receive Up Code Length Definition Bit 1. See Table 8-2
RUP0
IBCC.3
Receive Up Code Length Definition Bit 0. See Table 8-2
RDN2
IBCC.2
Receive Down Code Length Definition Bit 2. See Table 8-2
RDN1
IBCC.1
Receive Down Code Length Definition Bit 1. See Table 8-2
RDN0
IBCC.0
Receive Down Code Length Definition Bit 0. See Table 8-2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS21348TN | DATACOM, PCM TRANSCEIVER, PQFP44 |
| DS21348G | DATACOM, PCM TRANSCEIVER, BGA49 |
| DS21Q348N | DATACOM, PCM TRANSCEIVER, PBGA144 |
| DS21Q348 | DATACOM, PCM TRANSCEIVER, PBGA144 |
| DS21352L | DATACOM, PCM TRANSCEIVER, PQFP100 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS21348T+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21348TB | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21348TN | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21348TN+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21348TNB | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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