参数资料
型号: XRT75R12IB
厂商: Exar Corporation
文件页数: 40/90页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 12CH 420TBGA
标准包装: 40
类型: 线路接口装置(LIU)
驱动器/接收器数: 12/12
规程: DS3,E3,STS-1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 420-LBGA 裸露焊盘
供应商设备封装: 420-TBGA(35x35)
包装: 托盘
XRT75R12
42
REV. 1.0.4
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
6.2
LOOPBACKS
The XRT75R12 offers three loopback modes for diagnostic purposes. The loopback modes are selected via
the RLB_n and LLB_n bits n the Channel control registers select the loopback modes.
6.2.1
ANALOG LOOPBACK
In this mode, the transmitter outputs TTIP_n and TRing_n are internally connected to the receiver inputs
RTIP_n and RRing_n as shown in Figure 30. Data and clock are output at RxClk_n, RxPOS_n and RxNEG_n
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.
NOTES:
1.
In the Analog loopback mode, data is also output via TTIP_n and TRing_n pins.
2.
Signals on the RTIP_n and RRing_n pins are ignored during analog loopback.
FIGURE 30. ANALOG LOOPBACK
TRing
TTIP
RRing
RTIP
RxPOS
RxNEG
RxClk
TxNEG
TxClk
TxPOS
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
J
IT
T
E
R
A
T
E
N
U
A
T
O
R
J
IT
T
E
R
A
T
E
N
U
A
T
O
R
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
Tx
Rx
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