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XRT83SL28IV 数据表(PDF) 39 Page - Exar Corporation

部件名 XRT83SL28IV
功能描述  8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
PDF  47 Pages
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制造商  EXAR [Exar Corporation]
网页  http://www.exar.com
标志 EXAR - Exar Corporation

XRT83SL28IV 数据表(HTML) 39 Page - Exar Corporation

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XRT83SL28
REV. 1.0.0
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
37
D5
ARAOS_n Automatic Receive All Ones
If ARAOS_n is selected, an all ones pattern will be sent to the
RPOS/RNEG outputs if the channel experiences an RLOS condi-
tion. If RLOS does not occur, ARAOS_n will remain inactive.
"0" = Disabled
"1" = Enabled
R/W
0
D4
ATAOS_n
Automatic Transmit All Ones
If ATAOS_n is selected, an all ones pattern will be transmitted from
TTIP/TRING if the channel experiences an RLOS condition. If
RLOS does not occur, ATAOS_n will remain inactive.
"0" = Disabled
"1" = Enabled
R/W
0
D3
TAOS_n
Transmit All Ones
If TAOS_n is selected, an all ones pattern will be transmitted from
TTIP/TRING if the transmitter is turned on. Remote Loop Back
has priority over TAOS.
"0" = Disabled
"1" = Enabled
R/W
0
D2
TXOE_n
Transmit Output Enable
Upon power up, the tranmitters are tri-stated. This bit is used to
enable the transmitter for this channel if the TxOE pin is pulled
"High". If the TxOE pin is pulled "Low", all 8 transmitters are tri-
stated.
"0" = Transmitter is disabled
"1" = Transmitter is enabled if TxOE pin is pulled "High"
R/W
0
D1
D0
TERSEL1
TERSEL0
Receive Line Impedance Select
TERSEL[1:0] are used to select the internal line impedance.
"00" = 75
Ω for Tx and "High-Z" for Rx
"01" = 120
Ω for Tx and "High-Z" for Rx
"10" = 75
Ω for Tx and Rx
"11" = 120
Ω for Tx and Rx
R/W
0
0
TABLE 10: MICROPROCESSOR REGISTER BIT DESCRIPTION
CHANNEL CONTROL REGISTER (0X04H, 0X08H, 0X0CH, 0X10H, 0X14H, 0X18H, 0X1CH, 0X20H)
BIT
NAME
FUNCTION
Register
Type
Default
Value
(HW reset)



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