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參數(shù)資料
| 型號(hào)： | XRT83SL34IV-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 32/80頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU T1/E1/J1 QUAD 128TQFP |
| 標(biāo)準(zhǔn)包裝： | 72 |
| 類型： | 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： | 托盤 |
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XRT83SL34
QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.0
35
PATTERN TRANSMIT AND DETECT FUNCTION
Several test and diagnostic patterns can be generated and detected by the chip. In Hardware mode each
channel can be independently programmed to transmit an All Ones pattern by applying a “High” level to the
corresponding TAOS_n pin. In Host mode, the three interface bits TXTEST[2:0] control the pattern generation
and detection independently for each channel according to Table 12.
TRANSMIT ALL ONES (TAOS)
This feature is available in both Hardware and Host modes. With the TAOS_n pin connected to a “High” level
or when interface bits TXTEST2=“1”, TXTEST1=“0” and TXTEST0=“1” the transmitter ignores input from
TPOS_n/TDATA_n and TNEG_n/CODES_n pins and sends a continuous AMI encoded all “Ones” signal to the
line, using TCLK_n clock as the reference. In addition, when the Hardware pin and interface bit ATAOS is
activated, the chip will automatically transmit the All “Ones” data from any channel that detects an RLOS
condition. This feature is not available on a per channel basis. TCLK_n must NOT be tied “Low”.
NETWORK LOOP CODE DETECTION AND TRANSMISSION
This feature is available in Host mode only. When the interface bits TXTEST2=”1”, TXTEST1=”1” and
TXTEST0=”0” the chip is enabled to transmit the “00001” Network Loop-Up Code from the selected channel
requesting a Loop-Back condition from the remote terminal. Simultaneously setting the interface bits
NLCDE1=”0” and NLCDE0=”1” enables the Network Loop-Up code detection in the receiver. If the “00001”
Network Loop-Up code is detected in the receive data for longer than 5 seconds, the NLCD bit in the interface
register is set indicating that the remote terminal has activated remote Loop-Back and the chip is receiving its
own transmitted data. When the interface bits TXTEST2=”1”, TXTEST1=”1” and TXTEST0=”1” the chip is
enabled to transmit the Network Loop-Down Code (TLDC) “001” from the selected channel requesting the
remote terminal the removal of the Loop-Back condition.
In the Host mode each channel is capable of monitoring the contents of the receive data for the presence of
Loop-Up or Loop-Down code from the remote terminal. In the Host mode the two interface bits NLCDE[1:0]
control the Loop-Code detection independently for each channel according to Table 13.
Setting the interface bits to NLCDE1=”0” and NLCDE0=”1” activates the detection of the Loop-Up code in the
receive data. If the “00001” Network Loop-Up code is detected in the receive data for longer than 5 seconds,
the NLCD interface bit is set to “1” and stays in this state for as long as the receiver continues to receive the
TABLE 12: PATTERN TRANSMISSION CONTROL
TXTEST2
TXTEST1
TXTEST0
TEST PATTERN
0x
x
None
1
0
TDQRSS
1
0
1
TAOS
11
0
TLUC
11
1
TLDC
TABLE 13: LOOP-CODE DETECTION CONTROL
NLCDE1
NLCDE0
CONDITION
0
Disable Loop-Code Detection
0
1
Detect Loop-Up Code in Receive Data
1
0
Detect Loop-Down Code in Receive Data
1
Automatic Loop-Code detection and Remote Loop-Back Activation
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