XRT83SL28ES View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83SL28ES' PDF : 47 Pages View PDF
XRT83SL28
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
HARDWARE MODE INTERFACE
xr
REV. 1.0.0
NAME
PIN
TYPE
DESCRIPTION
SR/DR
2
I
Single Rail / Dual Rail Select Input
This pin is used to select Single Rail or Dual Rail data formats. By default,
Dual Rail is selected. To select Single Rail mode, this pin must be pulled
"High". Once this pin is pulled "High", TNEGn/CODEn can be used to select
between AMI and HDB3 Encoding/Decoding.
NOTE: Internally pulled "Low" with a 50kΩ resistor.
TERSEL1
125
TERSEL0
124
I
Termination Impedance Select
TERSEL[1:0] are used to set the internal impedance of the LIU for the Receive
and Transmit paths.
"00" = 75Ω for Tx and "High-Z" for Rx
"01" = 120Ω for Tx and "High-Z" for Rx
"10" = 75Ω for Tx and Rx
"11" = 120Ω for Tx and Rx
TCLKinv
107
I
Transmit Clock Data
"Low" = TPOS/TNEG data is sampled on the falling edge of TCLK
"High" = TPOS/TNEG data is sampled on the rising edge of TCLK
NOTE: Internally pulled "Low" with a 50kΩ resistor.
RCLKinv
74
I
Receive Clock Data
"Low" = RPOS/RNEG data is updated on the rising edge of RCLK
"High" = RPOS/RNEG data is updated on the falling edge of RCLK
NOTE: Internally pulled "Low" with a 50kΩ resistor.
LBM1
56
I
Loop Back Mode Select
LBM0
57
LBM[1:0] are used to configure the LIU into diagnostic loopback modes. To
select the channel number, see pins CHLB[3:0].
LBM1 LBM0
0
0
0
1
1
0
1
1
Loopback Mode
No Loopback
Analog Loopback
Remote Loopback
Digital Loopback
JASEL1
20
JASEL0
21
NOTE: Internally pulled "Low" with a 50kΩ resistor.
I
Jitter Attenuator Select
JASEL[1:0] are used to configure the jitter attenuator into the Receive or
Transmit path for all eight channels.
JASEL1 JASEL0
0
0
0
1
1
0
1
1
JA Select Mode
JA Disabled
Transmit Path
Receive Path
JA Disabled
NOTE: Internally pulled "Low" with a 50kΩ resistor.
10
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