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Rockwell SoniCrafter BT8960 User Manual

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3.0 Registers

3.1 Conventions

Bt8960

Single-Chip 2B1Q Transceiver

N8960DSB

data_source

[2:0]

Transmitter Mode

000

Isolated pulse. Level selected by isolated_pulse[1:0]. The meter timer must be enabled
and in the continuous 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 scrambled and looped back to the transmitter. Feedback polynomial deter-
mined by the htur_lfsr control bit.

010

Four-level unscrambled data. Transmits the four-level (2B1Q) sign and magnitude bits
from the channel unit transmit interface without scrambling.

011

Four-level scrambled ones. Transmits a scrambled, constant high logic level as a four-
level (2B1Q) signal. 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 mag-
nitude 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 channel unit
transmit interface to a logic zero and transmits the resulting two-level signal (as deter-
mined 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. Feedback 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.