XRT73L03A Datasheet, PDF (48/62 Pages) Exar Corporation – 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

XRT73L03A
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 2.0.4
To invert RxClk_(n), associated with Channel(n),
write a "1" into the RxClk_(n)INV bit-field within Com-
mand Register CR-3.
COMMAND REGISTER CR3-(n)
D4
D3
D2
D1
D0
(SR/DR)_(n)
LOSMUT_(n)
RxOFF_(n)
RxClk_(n)INV
Reserved
X
X
X
1
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
D3
D2
D1
D0
(SR/DR)_(n)
LOSMUT_(n)
RxOFF_(n)
RxClk_(n)INV
Reserved
1
X
X
X
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 32 and Figure 33.
b. Operating in the Hardware Mode
The XRT73L03A is configure to output Dual-Rail data
from the Receive Sections of all channels by pulling
the (SR/DR) pin to GND.
The XRT73L03A is configure to output Single-Rail
data from the Receive Sections of all channels by
pulling the (SR/DR) pin to VDD.
NOTE: When the XRT73L03A is operating in the Hardware
Mode, the setting of the (SR/DR) input pin applies globally
to all channels.
.
FIGURE 32. THE TYPICAL INTERFACE FOR THE TRANSMISSION OF DATA IN A SINGLE-RAIL FORMAT
FROM THE RECEIVE SECTION OF THE XRT73L03A TO THE RECEIVING TERMINAL EQUIPMENT
RxPOS
RPOS
TerminalEquipment
(E3/DS3 or STS-1
Framer)
RxClk
RxClk
Receive
Logic
Block
Exar E3/DS3/STS-1 LIU
46