
XRT83L30
48
REV. 1.0.1
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TABLE 20: MICROPROCESSOR REGISTER #2 BIT DESCRIPTION
REGISTER ADDRESS
00010
FUNCTION
REGISTER
TYPE
RESET
VALUE
BIT #
NAME
D7
RXON
Receiver ON:
Writing a “1” into this bit location turns on the
Receive Section. Writing a “0” shuts off the Receiver Section. In
this mode, RTIP and RRING driver outputs will be tri-stated for
power reduction or redundancy applications. Default is "0", off.
R/W
0
D6
TXTEST2
Transmit Test Pattern bit 2
: This bit together with TXTEST1
and TXTEST0 are used to generate and transmit test patterns
according to the following table:
TDQRSS (Transmit/Detect Quasi-Random Signal):
This con-
dition, when activated, enables Quasi-Random Signal Source
generation and detection. In a T1 system QRSS pattern is a 220-
1 pseudo-random bit sequence (PRBS) with no more than 14
consecutive zeros. In a E1 system, QRSS is a 215-1 PRBS pat-
tern.
TAOS (Transmit All Ones):
Activating this condition enables the
transmission of an All Ones Pattern. TCLK must not be tied
"Low".
TLUC (Transmit Network Loop-Up Code):
Activating this con-
dition enables the Network Loop-Up Code of "00001" to be trans-
mitted to the line. When Network Loop-Up code is being
transmitted, the XRT83L30 will ignore the Automatic Loop-Code
detection and Remote Loop-Back activation (NLCDE1 =“1”,
NLCDE0 =“1”, if activated) in order to avoid activating Remote
Digital Loop-Back automatically when the remote terminal
responds to the Loop-Back request.
TLDC (Transmit Network LOOP-Down Code):
Activating this
condition enables the network Loop-Down Code of "001" to be
transmitted to the line.
R/W
0
D5
TXTEST1
Transmit Test pattern bit 1:
See description of bit D6 for the
function of this bit.
R/W
0
D4
TXTEST0
Transmit Test Pattern bit 0:
See description of bit D6 for the
function of this bit.
R/W
0
1
0
1
0
1
0
Transmit Data
TAOS
TLUC
TLDC
Test Pattern
TXTEST1 TXTEST0
TXTEST2
1
0
1
0
1
TDQRSS
TDQRSS & INVQRSS
TDQRSS & INSBER
TDQRSS & INVQRSS & INS