參數(shù)資料
型號(hào): XRT75L04IVTR
廠商: Exar Corporation
文件頁(yè)數(shù): 49/57頁(yè)
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 4CH 176LQFP
標(biāo)準(zhǔn)包裝: 1,000
類型: 線路接口裝置(LIU)
驅(qū)動(dòng)器/接收器數(shù): 4/4
規(guī)程: DS3,E3,STS-1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 176-LQFP
供應(yīng)商設(shè)備封裝: 176-TQFP(24x24)
包裝: 帶卷 (TR)
XRT75L04
51
REV. 1.0.4
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
8.2.3
REMOTE LOOPBACK:
With Remote loopback activated as shown in Figure 28, the receive data on RTIP and RRING is looped back
after the jitter attenuator (if selected in receive or transmit path) to the transmit path using RxClk as transmit
timing. The receive data is also output via the RPOS and RNEG pins.
During the remote loopback mode, if the jitter attenuator is selected in the transmit path, the receive data after
the Clock and Data Recovery Block is looped back to the transmit path and passed through the jitter attenuator
using RxClk as the transmit timing.
NOTE: Input signals on TxClk, TPOS and TNEG are ignored during Remote loopback.
8.3
TRANSMIT ALL ONES (TAOS):
Transmit All Ones (TAOS) can be set either in Hardware mode by pulling the TAOS_n pins “High” or in Host
mode by setting the TAOS_n control bits to “1” in the Channel control registers. When the TAOS is set, the
Transmit Section generates and transmits a continuous AMI all “1’s” pattern on TTIP_n and TRING_n pins.
The frequency of this “1’s” pattern is determined by TClk_n.TAOS data path is shown in Figure 29.
FIGURE 28. REMOTE LOOPBACK
FIGURE 29. TRANSMIT ALL ONES (TAOS)
TRING
TTIP
RRING
RTIP
RPOS
RNEG
RCLK
TNDATA
TCLK
TPDATA
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
JI
T
E
R
2
ATTENUATOR
J
ITTER
2
ATTENUATOR
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
1 if enabled
2 if enabled and selected in either Receive or
Transmit path
Tx
Rx
1
TRING
TTIP
RRING
RTIP
RPOS
RNEG
RCLK
TNDATA
TCLK
TPDATA
HDB3/B3ZS
ENCODER
HDB3/B3ZS
DECODER
JITTER
2
ATTENUATOR
JITTER
2
ATTENUATOR
TIMING
CONTROL
DATA &
CLOCK
RECOVERY
1 if enabled
2 if enabled and selected in either Receive or
Transmit path
Tx
Rx
TAOS
Transmit All 1
1
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