XRT7302IV View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT7302IV' PDF : 62 Pages View PDF
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PRELIMINARY
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.6
The MUTing upon LOS feature for each Channel can
be enabled by writing a "1" into the LOSMUT(n) bit-
field in Command Register 3.
COMMAND REGISTER CR3-(N)
D4
D3
D2
D1
D0
SR/(DR)_(n)
LOSMUT(n)
RxOFF(n)
RxClk(n)INV
Reserved
X
1
X
X
X
NOTES:
1. This step only enables the MUTing upon LOS fea-
ture in Channel(n).
Each channel of the XRT7302 can deliver the recov-
ered data and clock information to the Receiving Ter-
minal in either a Single-Rail or Dual-Rail format.
2. Each channel(n) automatically declares an LOS
(Loss of Signal) condition anytime it has been conf-
gured to operate in either the Analog Local Loop-
Back or Digital Local Loop-Back modes. To config-
ure the chip to operate in either of these modes,
disable the MUTing-upon-LOS feature.
3.7 ROUTING THE RECOVERED TIMING AND DATA
INFORMATION TO THE RECEIVING TERMINAL
EQUIPMENT
Each channel in the XRT7302 takes the Recovered
Timing and Data information, converts it into CMOS
levels and routes it to the Receiving Terminal Equip-
ment via the RPOS(n), RNEG(n) and RxClk(n) output
pins.
3.7.1 Routing Dual-Rail Format Data to the
Receiving Terminal Equipment
Whenever a channel of the XRT7302 delivers Dual-
Rail format to the Terminal Equipment, it does so via
the following signals:
• RPOS(n)
• RNEG(n)
• RxClk(n)
Figure 22 illustrates the typical interface for the trans-
mission of data in a Dual-Rail Format from the Re-
ceive Section of a channel to the Receiving Terminal
Equipment
.
FIGURE 22. THE TYPICAL INTERFACE FOR THE TRANSMISSION OF DATA IN A DUAL-RAIL FORMAT
FROM THE RECEIVE SECTION OF THE XRT7302 TO THE RECEIVING TERMINAL EQUIPMENT
RxPOS RPOS
Terminal
EquTipemrmeintal
(E3/DSE3quoirpSmTeSn-t1
(E3F/DraSm3eor)r STS-1
Framer)
RxNEG
RxClk
RNEG
RxClk
Receive
LRoegciceive
BloLcokgic
Block
Exar E3/DS3/STS-1 LIU
The manner that a given channel transmits Dual-Rail
data to the Receiving Terminal Equipment is de-
scribed below and illustrated in Figure 23. Each
Channel(n) of the XRT7302 typically updates the data
on the RPOS(n) and RNEG(n) output pins on the ris-
ing edge of RxClk(n).
41
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