参数资料
型号: XRT83L30IV-F
厂商: Exar Corporation
文件页数: 36/78页
文件大小: 0K
描述: IC LIU LH/SH T1/E1 SGL 64TQFP
标准包装: 160
类型: 线路接口装置(LIU)
驱动器/接收器数: 1/1
规程: T1,E1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-TQFP(10x10)
包装: 托盘
其它名称: 1016-1633
XRT83L30IV-F-ND
XRT83L30
38
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
LOOP-BACK MODES
The XRT83L30 supports several Loop-Back modes under both Hardware and Host control. In Hardware
mode the two LOOP[1:0] pins control the Loop-Back functions according to Table 14.
In Host mode the Loop-Back functions are controlled by the three LOOP[2:0] interface bits. The LIU can be
programmed according to Table 15.
LOCAL ANALOG LOOP-BACK (ALOOP)
With Local Analog Loop-Back activated, the transmit data at TTIP and TRING are looped-back to the analog
input of the receiver. External inputs at RTIP/RRING in this mode are ignored while valid transmit data
continues to be sent to the line. Local Analog Loop-Back exercises most of the functional blocks of the
XRT83L30 including the jitter attenuator which can be selected in either the transmit or receive paths. Local
Analog Loop-Back is shown in Figure 20.
In this mode, the jitter attenuator (if selected) can be placed in the transmit or receive path.
TABLE 14: LOOP-BACK CONTROL IN HARDWARE MODE
LOOP1
LOOP0
LOOP-BACK MODE
0
None
0
1
Analog
1
0
Remote
1
Digital
TABLE 15: LOOP-BACK CONTROL IN HOST MODE
LOOP2
LOOP1
LOOP0
LOOP-BACK MODE
0
X
None
1
0
Dual
1
0
1
Analog
1
0
Remote
1
Digital
FIGURE 20. LOCAL ANALOG LOOP-BACK SIGNAL FLOW
Rx
Data &
Clock
Recovery
Decoder
TPOS
TNEG
TCLK
RCLK
RPOS
RNEG
Tx
Encoder
Timing
Control
JA
TTIP
TRING
RTIP
RRING
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