Rockwell SoniCrafter BT8960 - Manual (Page 73)

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3.0 Registers
3.1 Conventions
Bt8960
Single-Chip 2B1Q Transceiver
N8960DSB
3.2.44 0x3D—Feed Forward Equalizer Modes Register (ffe_modes)
adapt_last_coeff Adapt Last Coefficient—Read/write control bit enables adaptation of the last (oldest) coeffi-
cient only when set; allows all coefficient adaptation when cleared. Overall coefficient adapta-
tion must be enabled (adapt_coefficients = 1) for this behavior to occur. If coefficient
adaptation is disabled (adapt_coefficients = 0), the value of this control bit is not used.
zero_coefficients Zero Coefficients—Read/write control bit which, with coefficient adaptation enabled
(adapt_coefficients = 1), continuously zeros all coefficients when set; allows normal coeffi-
cient updates when cleared. If coefficient adaptation is disabled (adapt_coefficients = 0), this
control bit has no affect. This behavior differs slightly from the similar function
(zero_coefficients) of the LEC, NEC, and DFE filters.
adapt_coefficents Adapt Coefficients—Read/write control bit enables coefficient adaptation when set; dis-
ables/freezes adaptation when cleared. Coefficient values are preserved when adaptation is dis-
abled. This overall coefficient adaptation must be enabled for adapt_last_coeff to have an
affect.
adapt_gain Adaptation Gain—Read/write control bit specifies the adaptation gain. When set, the adapta-
tion gain is four times higher than when cleared.
3.2.45 0x3E—Error Predictor Modes Register (ep_modes)
zero_output Zero Output—Read/write control bit which, when set, zeros the error predictor correction sig-
nal before subtraction from the input signal. Achieves the affect of disabling, or bypassing, the
error predictor function. Does not disable coefficient adaptation. When cleared, normal error
predictor operation is performed.
zero_coefficients Zero Coefficients—Read/write control bit which, with coefficient adaptation enabled
(adapt_coefficients = 1), continuously zeros all coefficients when set; allows normal coeffi-
cient updates when cleared. If coefficient adaptation is disabled (adapt_coefficients = 0), this
control bit has no affect. This behavior differs slightly from the similar function
(zero_coefficients) of the LEC, NEC, and DFE filters.
adapt_coefficents Adapt Coefficients—Read/write control bit enables coefficient adaptation when set; dis-
ables/freezes adaptation when cleared. Coefficient values are preserved when adaptation is dis-
abled.
adapt_gain Adaptation Gain—Read/write control bit specifies the adaptation gain. When set, the adapta-
tion gain is four times higher than when cleared.
7 6 5 4 3 2 1 0
– – – – adapt_last_coeff zero_coefficents
adapt_
coefficents
adapt_gain
7 6 5 4 3 2 1 0
– – – – zero_output zero_coefficients
adapt_
coefficients
adapt_gain