CS47L35 datasheet(60/300 Pages) CIRRUS

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DS1085F3

CS47L35

4.3 Digital Core

The CS47L35 performs automatic checks to confirm whether the SYSCLK frequency is high enough to support the

commanded LHPF and digital mixing functions. If the frequency is too low, an attempt to enable an LHPF signal path fails.

Note that active signal paths are not affected under such circumstances.

The FX_STS field in register R3585 indicates the status of each of the EQ, DRC, and LHPF signal paths. If an

underclocked error condition occurs, this field indicates which EQ, DRC, or LHPF signal paths have been enabled.

The status bits in registers R1600–R2936 indicate the status of each of the digital mixers. If an underclocked error

condition occurs, these bits indicate which mixers have been enabled.

Table 4-15. Low-Pass Filter/High-Pass Filter

Label

Default

Description

R3585 (0x0E01)

FX_Ctrl2

15:4 FX_STS[11:0]

0x00 LHPF, DRC, EQ Enable Status. Indicates the status of the respective

signal-processing functions. Each bit is coded as follows:

0 = Disabled

1 = Enabled

[11] = EQ4

[10] = EQ3

[9] = EQ2

[8] = EQ1

[7] = DRC2 (Right)

[6] = DRC2 (Left)

[5] = DRC1 (Right)

[4] = DRC1 (Left)

[3] = LHPF4

[2] = LHPF3

[1] = LHPF2

[0] = LHPF1

R3776 (0x0EC0)

HPLPF1_1

LHPF1_MODE

Low-/High-Pass Filter 1 Mode

0 = Low Pass

1 = High Pass

LHPF1_ENA

Low-/High-Pass Filter 1 Enable

0 = Disabled

1 = Enabled

R3777 (0x0EC1)

HPLPF1_2

15:0 LHPF1_COEFF[15:0] 0x0000 Low-/High-Pass Filter 1 Frequency Coefficient

Refer to WISCE evaluation board control software for the derivation of this field

value.

R3780 (0x0EC4)

HPLPF2_1

LHPF2_MODE

Low-/High-Pass Filter 2 Mode

0 = Low Pass

1 = High Pass

LHPF2_ENA

Low-/High-Pass Filter 2 Enable

0 = Disabled

1 = Enabled

R3781 (0x0EC5)

HPLPF2_2

15:0 LHPF2_COEFF[15:0] 0x0000 Low-/High-Pass Filter 2 Frequency Coefficient

Refer to WISCE evaluation board control software for the derivation of this field

value.

R3784 (0x0EC8)

HPLPF3_1

LHPF3_MODE

Low-/High-Pass Filter 3 Mode

0 = Low Pass

1 = High Pass

LHPF3_ENA

Low-/High-Pass Filter 3 Enable

0 = Disabled

1 = Enabled

R3785 (0x0EC9)

HPLPF3_2

15:0 LHPF3_COEFF[15:0] 0x0000 Low-/High-Pass Filter 3 Frequency Coefficient

Refer to WISCE evaluation board control software for the derivation of this field

value.

R3788 (0x0ECC)

HPLPF4_1

LHPF4_MODE

Low-/High-Pass Filter 4 Mode

0 = Low Pass

1 = High Pass

LHPF4_ENA

Low-/High-Pass Filter 4 Enable

0 = Disabled

1 = Enabled

R3789 (0x0ECD)

HPLPF4_2

15:0 LHPF4_COEFF[15:0] 0x0000 Low-/High-Pass Filter 4 Frequency Coefficient

Refer to WISCE evaluation board control software for the derivation of this field

value.

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