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参数资料
| 型号： | XRT75VL00D |
| 厂商： | Exar Corporation |
| 英文描述： | E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
| 中文描述： | E3/DS3/STS-1线路接口单元与SONET DESYNCHRONIZER |
| 文件页数： | 43/92页 |
| 文件大小： | 836K |
| 代理商： | XRT75VL00D |
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XRT75VL00D
E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
REV. 1.0.3
43
8.0
DIAGNOSTIC FEATURES:
8.1
PRBS Generator and Detector:
The XRT75VL00D contains an on-chip Pseudo Random Binary Sequence (PRBS) generator and detector for
diagnostic purpose. This feature is only available in Host mode. With the PRBSEN bit = “1”, the transmitter will
send out PRBS of 223-1 in E3 rate or 215-1 in STS-1/DS3 rate. At the same time, the receiver PRBS detector is
also enabled. When the correct PRBS pattern is detected by the receiver, the RNEG/LCV pin will go “Low” to
indicate PRBS synchronization has been achieved. When the PRBS detector is not in sync the PRBSLS bit will
be set to “1” and RNEG/LCV pin will go “High”.
With the PRBS mode enabled, the user can also insert a single bit error by toggling “INSPRBS” bit. This is
done by writing a “1” to INSPRBS bit. The receiver at RNEG/LCV pin will pulse “High” for half RxClk cycle for
every bit error detected. Any subsequent single bit error insertion must be done by first writing a “0” to
INSPRBS bit and followed by a “1”.
When PRBS mode is enabled, the PRBS counter starts counting each single bit error. The PRBS counter is 16
bits wide. The current value in the counter can be read via two readback operations of the Serial I/O registers.
1) Either the Least Significant Byte (LSB, address 0x30) or the Most Significant Byte (MSB, address 0x31) can
be read first. The value of the un-read register will be copied into the Holding register (address 0x38) and both
the LSB and MSB registers will be reset to zero.
2) Read the Holding register and concatenate the result with the value from the first read operation to get the
full 16 bit counter value.
When the PRBS mode is first enabled, errors will be counted while the receiver logic is synchronizing to the
PRBS pattern. When RNEG/LCV goes “Low” indicating PRBS synchronization, reset the counter by reading
either the LSB or the MSB register.
Figure 25 shows the status of RNEG/LCV pin when the XRT75VL00D is configured in PRBS mode.
8.2
LOOPBACKS:
The XRT75VL00D offers three loopback modes for diagnostic purposes. In Hardware mode, the loopback
modes are selected via the RLB and LLB pins. In Host mode, the RLB and LLB bits in the control registers
select the loopback modes.
8.2.1
ANALOG LOOPBACK:
In this mode, the transmitter outputs (TTIP and TRING) are connected internally to the receiver inputs (RTIP
and RRING) as shown in Figure 26. Data and clock are output at RCLK, RPOS and RNEG pins for the
corresponding transceiver. Analog loopback exercises most of the functional blocks of the device including the
jitter attenuator which can be selected in either the transmit or receive path.
FIGURE 25. PRBS MODE
RClk
RNEG/LCV
SYNC LOSS
PRBS SYNC
Single Bit Error
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT75VL00D_08 | 制造商:EXAR 制造商全称:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET |
| XRT75VL00D1V-F | 制造商:Exar Corporation 功能描述: |
| XRT75VL00DES | 功能描述:时钟合成器/抖动清除器 1CHT3/E3/STS1LIU+ DESYNC 3.3V DRV VER RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| XRT75VL00DIV | 功能描述:时钟合成器/抖动清除器 3.3V 1 CH E3/DS3/STS W/SONET DE-SYNCH RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| XRT75VL00DIV-F | 功能描述:时钟合成器/抖动清除器 3.3V 1 CH E3/DS3/STS W/SONET DE-SYNCH RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
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