XRT86L30
REV. 1.0.1
SINGLE T1/E1/J1 FRAMER/LIU COMBO
TABLE 146: MICROPROCESSOR
REGISTER #559 BIT DESCRIPTION
R
EGISTER ADDRESS
C
HANNEL_0
R
EGISTER
YPE
R
VALUE
ESET
0X0F03H
FUNCTION
T
Bit #
D7
NAME
NLCDE1_n Network Loop Code Detection Enable Bit 1:
R/W
0
This bit together with NLCDE0_n control the Loop-Code detec-
tion of each channel.
NLCDE1
NLCDE0
Function
Disable Loop-code
detection
Detect Loop-Up code
in receive data
Detect Loop-Down
code in receive data
Automatic Loop-Code
detection
0
0
1
1
0
1
0
1
When NLCDE1 =”0” and NLCDE0 = “1” or NLCDE1 = “1” and
NLCDE0 = “0”, the chip is manually programmed to monitor
the receive data for the Loop-Up or Loop-Down code respec-
tively.When the presence of the “00001” or “001” pattern is
detected for more than 5 seconds, the status of the NLCD bit is
set to “1” and if the NLCD interrupt is enabled, an interrupt is
initiated.The Host has the option to control the Loop-Back
function manually.
Setting the NLCDE1 = “1” and NLCDE0 = “1” enables the
Automatic Loop-Code detection and Remote Loop-Back acti-
vation mode. As this mode is initiated, the state of the NLCD
interface bit is reset to “0” and the chip is programmed to mon-
itor the receive data for the Loop-Up code. If the “00001” pat-
tern is detected for longer than 5 seconds, the NLCD bit is set
“1”, Remote Loop-Back is activated and the chip is automati-
cally programmed to monitor the receive data for the Loop-
Down code. The NLCD bit stays set even after the chip stops
receiving the Loop-Up code. The Remote Loop-Back condition
is removed when the chip receives the Loop-Down code for
more than 5 seconds or if the Automatic Loop-Code detection
mode is terminated.
D6
D5
NLCDE0_n Network Loop Code Detection Enable Bit 0:
See description of D7 for function of this bit.
R/W
R/W
0
0
Reserved
This Bit Is Not Used
126
EXAR [ EXAR CORPORATION ]
