- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383876 > T7633 (Lineage Power) Dual T1/E1 3.3 V Short-Haul Terminator(雙T1/E1 3.3V短通信距離終端器) PDF資料下載
參數(shù)資料
| 型號： | T7633 |
| 廠商： | Lineage Power |
| 英文描述： | Dual T1/E1 3.3 V Short-Haul Terminator(雙T1/E1 3.3V短通信距離終端器) |
| 中文描述： | 雙T1/E1的3.3伏短途終結(jié)者（雙T1/E1的3.3短通信距離終端器） |
| 文件頁數(shù)： | 127/248頁 |
| 文件大小： | 1459K |
| 代理商： | T7633 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁當前第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁第229頁第230頁第231頁第232頁第233頁第234頁第235頁第236頁第237頁第238頁第239頁第240頁第241頁第242頁第243頁第244頁第245頁第246頁第247頁第248頁
Advance Data Sheet
May 1998
T7633 Dual T1/E1 3.3 V Short-Haul Terminator
117
Lucent Technologies Inc.
Facility Data Link (FDL)
(continued)
HDLC Operation
(continued)
CRC-16
For given user data bits, 16 additional bits that constitute an error-detecting code (CRC-16) are added by the
transmitter. As called for in the HDLC protocol, the frame check sequence bits are transmitted most significant bit
first and are bit stuffed. The cyclic redundancy check (or frame check sequence) is calculated as a function of the
transmitted bits by using the ITU-T standard polynomial:
x
16
+ x
12
+ x
5
+ 1
The transmitter can be instructed to transmit a corrupted CRC by setting register FDL_PR2 bit 7 (FTBCRC) to 1.
As long as the FTBCRC bit is set, the CRC is corrupted for each frame transmitted by logically flipping the least
significant bit of the transmitted CRC.
The receiver performs the same calculation on the received bits after destuffing and compares the results to the
received CRC-16 bits. An error indication occurs if, and only if, there is a mismatch.
Transmit FDL FIFO
Transmit FDL data is loaded into the 64-byte transmit FIFO via the transmit FDL data register, FDL_PR4. The
transmit FDL status register indicates how many additional bytes can be added to the transmit FIFO. The transmit
FDL interrupt trigger level register FDL_PR3 bit 0—bit 5 (FTIL) can be programmed to tailor service time intervals
to the system environment. The transmitter empty interrupt bit is set in the FDL interrupt status register FDL_SR0
bit 1 (FTEM) when the transmit FIFO has sufficient empty space to add the number of bytes specified in register
FDL_PR3 bit 0—bit 5. There is no interrupt indicated for a transmitter overrun that is writing more data than empty
spaces exist. Overrunning the transmitter causes the last valid data byte written to be repeatedly overwritten,
resulting in missing data in the frame.
Data associated with multiple frames can be written to the transmit FIFO by the controlling microprocessor.
However, all frames must be explicitly tagged with a transmit frame complete, register FDL_PR3 bit 7 (FTFC), or a
transmit abort, register FDL_PR3 bit 6 (FTABT). The FTFC is tagged onto the last byte of a frame written into the
transmitter FIFO and instructs the transmitter to end the frame and attach the CRC and closing flag following the
tagged byte. Once written, the FTFC cannot be changed by another write to register FDL_PR3. If FTFC is not
written before the last data byte is read out for transmission, an underrun occurs (FDL_SR0 bit 2). When the
transmitter has completed a frame, with a closing flag or an abort sequence, register FDL_SR0 bit 0 (FTDONE) is
set to 1. An interrupt is generated if FDL_PR2 bit 0 (FTDIE) is set to 1.
Sending 1-Byte Frames
Sending 1-byte frames with an empty transmit FIFO is not recommended. If the FIFO is empty, writing two data
bytes to the FIFO before setting FTFC provides a minimum of eight TFDLCK periods to set FTFC. When 1 byte is
written to the FIFO, FTFC must be written within 1 TFDLCK period to guarantee that it is effective. Thus, 1-byte
frames are subject to underrun aborts. One-byte frames cannot be aborted with FTABT. Placing the transmitter in
1s-idle mode, register FDL_PR0 bit 1 (FLAGS) = 0, lessens the frequency of underruns. If the transmit FIFO is not
empty, then 1-byte frames present no problems.
Transmitter Underrun
After writing a byte to the transmit queue, the user has eight TFDLCK cycles in which to write the next byte before
a transmitter underrun occurs. An underrun occurs when the transmitter has finished transmitting all the bytes in
the queue, but the frame has not yet been closed by setting FTFC. When a transmitter underrun occurs, the abort
sequence is sent at the end of the last valid byte transmitted. A FTDONE interrupt is generated, and the transmitter
reports an underrun abort until the interrupt status register is read.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T7688 | 5.0 V E1/CEPT Quad Line Interface(5.0 V E1/CEPT四線接口) |
| T7689 | 5.0 V T1 Quad Line Interface(5.0 V T1四線接口) |
| T7690 | 5.0 V T1/E1 Quad Line Interface(5.0 V T1/E1 四線接口) |
| T7693 | 3.3 V T1/E1 Quad Line Interface( 3.3 V T1/E四線接口) |
| T7698 | Quad T1/E1 Line Interface and Octal T1/E1 Monitor(四T1/E1線接口和八T1/E1監(jiān)控器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T7645036 | 功能描述:手工工具 Campbell Snap Link #2450, 7/16", Steel RoHS:否 制造商:Molex 產(chǎn)品:Extraction Tools 類型: 描述/功能:Extraction tool |
| T7645106 | 制造商:COOPER INDUSTRIES 功能描述:CC ACCESYS / #7350 1/8 Quick Link Steel Zinc Plated UPC Tagged |
| T7645126 | 制造商:COOPER INDUSTRIES 功能描述:CC ACCESYS / #7350 1/4 Quick Link Steel Zinc Plated UPC Tagged |
| T7645136V | 制造商:COOPER INDUSTRIES 功能描述:CC ACCESYS / #7350 5/16 Quick Link Steel Zinc Plated UPC Tagged |
| T7645146 | 制造商:COOPER INDUSTRIES 功能描述:CC ACCESYS / #7350 3/8 Quick Link Steel Zinc Plated UPC Tagged |
發(fā)布緊急采購，3分鐘左右您將得到回復。