Specifications

DATA SHEET QF4A512
Rev D4, Dec 07 48 www.quickfiltertech.com
Address 3Ah X D6 D5 D4 D3 D2 D1 D0
Description: CIC shift value, default; value = 0. This is a function of the CIC “R” value and along with AREC_GAIN (33h, 34h) is
calculated automatically by the Quickfilter Pro software.
Note: The following registers (3Bh – 50h) have values generated by the Quickfilter Pro Design Software. Manual alteration of
these registers is not recommended, the descriptions are for reference only.
3Bh FIR_0_0_CTRL (FIR Control, filter 0)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 3Bh fir_0_0_decimf2 fir_0_0_decimf2 fir_0_0_decimf1 fir_0_0_decimf1 X fir_0_0_oddf2 fir_0_0_oddf1 fir_0_0_f2_enable
fir_0_0_f2_enable
*0 = Disable
1 = Enable
Description: Enable the second filter block, f2.
fir_0_0_oddf1
*0 = Disable
1 = Enable
Description: Set an odd number of taps for f1.
fir_0_0_oddf2
*0 = Disable
1 = Enable
Description: Set an odd number of taps for f2.
fir_0_0_decimf1
Description: Decimation value for f1. Default value = 0, values in range 0 – 3.
fir_0_0_decimf2
Description: Decimation value for f2. Default value = 0, values in range 0 – 3.
3Ch FIR_0_0_NMIN_F1 (Minimum storage address for f1)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 3Ch X addr6 addr5 addr4 addr3 addr2 addr1 addr0
Default value = 0
3Dh FIR_0_0_NMAX_F1 (Maximum storage address for f1)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 3Dh X addr6 addr5 addr4 addr3 addr2 addr1 addr0
Default value = 7F
Description: Minimum and maximum data storage (tap) address values for f1.
3Eh FIR_0_0_CMIN_F1 (Minimum coefficient storage address for f1)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 3Eh X X addr5 addr4 addr3 addr2 addr1 addr0
Default value = 0