Rockwell SoniCrafter BT8960 User Manual

Bt8960

 N8960DSB

The input source selector/scrambler can be configured through the Transmitter
Modes Register [transmitter_modes; 0x0B] data_source [2:0] bits to select the
source of the data to be transmitted and determine whether or not the data is
scrambled. The symbol source selector/scrambler modes are specified in Table 2-
1.

000

Isolated pulse. Level selected by isolated_pulse[1,0]. The meter timer must be enabled and in the con-
tinuous mode. The pulse repetition interval is determined by the meter-timer-countdown interval. 

001

Four-level scrambled detector loopback. Sign and magnitude bits from the receiver detector are scram-
bled and looped back to the transmitter. Feedback polynomial determined by the htur_lfsr control bit. 

010

Four-level unscrambled data. Transmits the four-level (2B1Q) sign and magnitude bits from the transmit 
channel unit.

011

Four-level scrambled ones. Transmits a scrambled, constant high-logic level as a four-level (2B1Q) sig-
nal. Feedback polynomial determined by the htur_lfsr control bit. 

100

Reserved. 

101

Four-level scrambled data. Scrambles and transmits the four-level (2B1Q) sign and magnitude bits from 
the channel unit transmit interface. Feedback polynomial determined by the htur_lfsr control bit. 

110

Two-level unscrambled data. Constantly forces the magnitude bit from the transmit channel unit inter-
face to a logic zero, and transmits the resulting two-level signal (as determined by the sign bit) without 
scrambling. Valid output levels limited to +3, –3. 

111

Two-level scrambled ones. Transmits a scrambled, constant high-logic level, as a two-level signal. Feed-
back polynomial determined by the htur_lfsr control bit. Scrambler is run at the symbol rate (half-bit 
rate) to produce the sign bit of the transmitted signal while the magnitude bit is sourced with a constant 
logic zero. Valid output levels limited to +3, –3.