QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR REV. 1.0.1 46 LOO" />
型號(hào): XRT83L34IVTR-F
廠商: Exar Corporation
文件頁(yè)數(shù): 44/99頁(yè)
文件大?。?/td> 0K
描述: IC LIU T1/E1/J1 QUAD 128TQFP
標(biāo)準(zhǔn)包裝: 750
類(lèi)型: 線路接口裝置(LIU)
驅(qū)動(dòng)器/接收器數(shù): 4/4
規(guī)程: T1,E1,J1
電源電壓: 3.135 V ~ 3.465 V
安裝類(lèi)型: 表面貼裝
封裝/外殼: 128-LQFP
供應(yīng)商設(shè)備封裝: 128-TQFP(14x20)
包裝: 帶卷 (TR)
xr
XRT83L34
QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR REV. 1.0.1
46
LOOP-BACK MODES
The XRT83L34 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 for each channel independently according to
In Host mode the Loop-Back functions are controlled by the three LOOP[2:0] interface bits. Each channel can
be programmed independently 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
XRT83L34 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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