11 0x0a—decision feedback equalizer modes re, 12 0x0b—transmitter modes register (transmit – Rockwell SoniCrafter BT8960 User Manual
Page 60
50
3.0 Registers
3.1 Conventions
Bt8960
Single-Chip 2B1Q Transceiver
N8960DSB
3.2.11 0x0A—Decision Feedback Equalizer Modes Register (dfe_modes)
adapt_coefficents
Adapt Coefficients—Read/write control bit which enables coefficient adaptation when set; dis-
ables/freezes adaptation when cleared. Coefficient values are preserved when adaptation is dis-
abled.
zero_coefficients
Zero Coefficients—Read/write control bit which continuously zeros all coefficients when set;
allows normal coefficient updates, if enabled, when cleared.
zero_output
Zero Output—Read/write control bit which, when set, zeros the equalizer correction signal
before subtraction from the input signal. Achieves the affect of disabling or bypassing the
equalization function. Does not disable coefficient adaptation. When cleared, normal equalizer
operation is performed.
adapt_gain
Adaptation Gain—Read/write control bit which specifies the adaptation gain. When set, the
adaptation gain is eight times higher than when cleared.
3.2.12 0x0B—Transmitter Modes Register (transmitter_modes)
isolated_pulse[1,0]
Isolated Pulse Level Select—Read/write binary field that selects one of four output pulse lev-
els while in the isolated pulse transmitter mode.
transmitter_off
Transmitter Off—Read/write control bit that zeros the output of the transmitter when set;
allows normal transmitter operation (as defined by data_source[2:0]) when cleared.
htur_lfsr
Remote Unit (HTU-R/NTU) Polynomial Select—Read/write control bit selects one of two
feedback polynomials for the transmit scrambler. When set, this bit selects the remote unit
transmit polynomial (x
–23
+ x
–18
+ 1); when cleared, it selects the local unit (HTU-C/LTU)
polynomial (x
–23
+ x
–5
+ 1).
data_source[2:0]
Data Source—Read/write binary field that selects the data source and mode of the transmitter
output. The transmitter must be enabled (transmitter_off = 0) for these modes to be active.
7
6
5
4
3
2
1
0
–
–
–
–
adapt_
coefficients
zero_coefficients
zero_output
adapt_gain
7
6
5
4
3
2
1
0
–
isolated_pulse[1] isolated_pulse[0]
transmitter_off
htur_lfsr
data_source[2]
data_source[1]
data_source[0]
isolated_pulse[1,0]
Output Pulse Level
00
–3
01
–1
10
+3
11
+1