XRT7250 Datasheet, PDF (461/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

XRT7250
DS3/E3 FRAMER IC
REV. 1.1.1
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(Local Loop-back) within the Framer Operating Mode
Register, as illustrated below.
FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00)
BIT 7
Local Loopback
BIT 6
DS3/E3*
R/W
R/W
1
X
BIT 5
Internal
LOS
Enable
R/W
X
BIT 4
RESET
BIT 3
Interrupt
Enable Reset
BIT 2
Frame Format
R/W
R/W
R/W
0
X
X
BIT 1
BIT 0
TimRefSel[1:0]
R/W
R/W
X
X
NOTES:
1. When the XRT7250 DS3/E3 Framer IC is operating
in the Framer Local-Loop-back Mode, no data will
be output via the TxPOS and TxNEG output pins.
2. The XRT7250 DS3/E3 Framer IC cannot be config-
ured to operate in the Framer Local Loop-back
Mode, if it is configured to operate in Modes 1 or
Mode 4 (Loop-Timing Modes). The user must con-
figure the XRT7250 Framer to operate in one of the
Local-Timing modes.
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