ad1985jstz-reel Analog Devices, Inc., ad1985jstz-reel Datasheet - Page 33

• Manufacturer Part Number: ad1985jstz-reel
• Description: Ac ?97 Soundmax Codec
• Manufacturer: Analog Devices, Inc.

EQ Control Register (Index 0x60)
Reg.Num.
0x60
Register 0x60 is a read/write register that controls equalizer
function and data setup. The register also contains the biquad
and coefficient address pointer, which is used in conjunction
with the EQ data register (0x78) to set up the equalizer
coefficients. The reset default disables the equalizer function
BCA[5:0]
CHS
SYM
EQM
Biquad and Coefficient Address Pointer:
biquad 0
biquad 0
biquad 0
biquad 0
biquad 0
biquad 1
biquad 1
biquad 1
biquad 1
biquad 1
biquad 2
biquad 2
biquad 2
biquad 2
biquad 2
biquad 3
biquad 3
biquad 3
biquad 3
biquad 3
biquad 4
biquad 4
biquad 4
biquad 4
biquad 4
biquad 5
biquad 5
biquad 5
biquad 5
biquad 5
biquad 6
biquad 6
biquad 6
biquad 6
biquad 6
Channel Select. CHS = 0: Selects left channel coefficients data block. CHS = 1: Selects right channel coefficients data block.
Symmetry. When set to 1 this bit indicates that the left and right channel coefficients are equal. This shortens the coefficient
setup sequence since only the left channel coefficients need to be addressed and set up. (The right channel coefficients are
simultaneously copied into memory.)
Equalizer Mute. When set to 1, this bit disables the equalizer function (allows all data to pass through). The reset default sets this
bit to 1, disabling the equalizer function until the biquad coefficients can be properly set.
Name
EQ Control
coef a0
coef a1
coef a2
coef b1
coef b2
coef a0
coef a1
coef a2
coef b1
coef b2
coef a0
coef a1
coef a2
coef b1
coef b2
coef a0
coef a1
coef a2
coef b1
coef b2
coef a0
coef a1
coef a2
coef b1
coef b2
coef a0
coef a1
coef a2
coef b1
coef b2
coef a0
coef a1
coef a2
coef b1
coef b2
D15 D14 D13 D12 D11 D10 D9 D8 D7
EQM X
X
BCA[5:0] = 011011
BCA[5:0] = 011010
BCA[5:0] = 011001
BCA[5:0] = 011101
BCA[5:0] = 011100
BCA[5:0] = 100000
BCA[5:0] = 011111
BCA[5:0] = 011110
BCA[5:0] = 100010
BCA[5:0] = 100001
BCA[5:0] = 100101
BCA[5:0] = 100100
BCA[5:0] = 100011
BCA[5:0] = 100111
BCA[5:0] = 100110
BCA[5:0] = 101010
BCA[5:0] = 101001
BCA[5:0] = 101000
BCA[5:0] = 101100
BCA[5:0] = 101011
BCA[5:0] = 101111
BCA[5:0] = 101110
BCA[5:0] = 101101
BCA[5:0] = 110001
BCA[5:0] = 110000
BCA[5:0] = 110100
BCA[5:0] = 110011
BCA[5:0] = 110010
BCA[5:0] = 110110
BCA[5:0] = 110101
BCA[5:0] = 111001
BCA[5:0] = 111000
BCA[5:0] = 110111
BCA[5:0] = 111011
BCA[5:0] = 111010
X
X
X
Rev. A | Page 33 of 48
X
X
SYM CHS BCA5 BCA4 BCA3 BCA2 BCA1 BCA0 0x8080
until the coefficients can be properly set up by the software and
sets the symmetry bit to allow equal coefficients for left and
right channels.
D6
D5
D4
D3
D2
D1
D0
AD1985
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