XRT73LC04A
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
COMMAND REGISTER CR3-(n)
D4
(SR/DR)_(n)
X
D3
LOSMUT_(n)
X
D2
RxOFF
X
D1
RxClk_(n)INV
1
D0
Reserved
X
b. Operating in the Hardware Mode
Setting the RxClkINV input pin “High" inverts all the
RxClk_(n) output signals.
3.6.2 Routing Single-Rail Format (Binary Data
Stream) data to the Receive Terminal Equipment
To route Single-Rail format data (e.g., a binary data
stream) from the Receive Section of a channel to the
Receiving Terminal Equipment, do the following.
a. Operating in the HOST Mode
To configure Channel(n) to output Single-Rail data to
the Terminal Equipment, write a "1" into the (SR/
DR)_(n) bit-field within Command Register CR3-(n).
COMMAND REGISTER CR3-(n)
D4
(SR/DR)_(n)
1
D3
LOSMUT_(n)
X
D2
RxOFF
X
D1
RxClk_(n)INV
X
D0
Reserved
X
The configured channel outputs Single-Rail data to
the Receiving Terminal Equipment via its correspond-
ing RPOS_(n) and RxClk_(n) output pins, as illustrat-
ed in Figure 31 and Figure 32.
b. Operating in the Hardware Mode
The XRT73LC04A is configure to output Dual-Rail
data from the Receive Sections of all channels by
pulling the (SR/DR) pin to GND.
The XRT73LC04A is configure to output Single-Rail
data from the Receive Sections of all channels by
pulling the (SR/DR) pin to VDD.
N
OTE
:
When the XRT73LC04A is operating in the Hard-
ware Mode, the setting of the (SR/DR) input pin applies glo-
bally to all channels.
.
F
IGURE
31. T
HE TYPICAL INTERFACE FOR THE
T
RANSMISSION OF
D
ATA IN A
S
INGLE
-R
AIL
F
ORMAT
FROM THE
R
ECEIVE
S
ECTION OF THE
XRT73LC04A
TO THE
R
ECEIVING
T
ERMINAL
E
QUIPMENT
RxPOS
RPOS
TerminalEquipment
(E3/DS3 or STS-1
Framer)
RxClk
RxClk
Receive
Logic
Block
Exar E3/DS3/STS-1 LIU
45
EXAR [ EXAR CORPORATION ]
