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參數(shù)資料
| 型號(hào)： | XRT91L32IQTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 22/37頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX SONET/SDH 8BIT 100QFP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 規(guī)程： | SONET/SDH |
| 電源電壓： | 3.3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 100-BQFP |
| 供應(yīng)商設(shè)備封裝： | 100-QFP（14x20） |
| 包裝： | 帶卷 (TR) |
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XRT91L32
REV. 1.0.3
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
27
4.3
Analog Local Loopback
Analog Local Loopback (ALOOP) controls a more comprehensive version of digital local loopback in which the
point where the transmit data is looped back is moved all the way back to the high-speed receive I/O. The
transmit data from the transmit parallel interface TXDI[7:0] is serialized and presented to the high-speed
transmit output TXOP/N using the high-speed 622.08/155.52 MHz transmit clock generated from the clock
multiplier unit. In addition, the high-speed transmit data TXOP/N is looped back to the receive clock and data
recovery unit, replacing the RXIP/N. The signal is then processed by the CDR, and is sent through the serial to
parallel converter and presented at the low-speed receive parallel interface RXDO[7:0]. ALOOP is invoked by
asserting the ALOOP pin "High." A simplified block diagram of parallel remote loopback is shown in Figure 18.
Receive data mute upon "LOS
4.4
Split Loopback
The serial remote loopback and the digital local loopback can be combined to form a split loopback. The
output of the parallel to serial converter is looped back and presented to the high-speed input of the receiver
serial to parallel converter. The high-speed serial receive data from RXIP/N is presented at the high speed
transmit output TXOP/N, and the high-speed recovered clock is selected to re-time the high speed transmit
data output. A simplified block diagram of parallel remote loopback is shown in Figure 19.
FIGURE 19. SPLIT LOOPBACK
FIGURE 18. ANALOG LOCAL LOOPBACK
PISO
Re-Timer
LVPECL
Output Drivers
LVPECL
Input Drivers
CDR
SIPO
Tx Parallel Input
Rx Parallel Output
Tx Serial Output
Analog Local Loop back
PISO
Re-Timer
LVPECL
Output Drivers
LVPECL
Input Drivers
CDR
SIPO
Tx Parallel Input
Rx Parallel Output
Tx Serial Output
Split Loopback
Rx Serial Input
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| XRT91L33 | 制造商:EXAR 制造商全稱:EXAR 功能描述:STS-12/STS-3 MULTIRATE CLOCK AND DATA RECOVERY UNIT |
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