LM4560 datasheet(30/54 Pages) NSC

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3.0 Register Description (Continued)

when Bit[31:30] = 1x (REC or REC_PB)

00: left,

01: right

10: (left+right+1)/2

11: reserved.

Bit[23] SRC Enable

0 disable

1 enable

Bit[22] FM and AM Enable

0 disable

1 enable

Bit[21] PAN Enable

0 disable

1 enable

Bit[20] Channel Volume Enable

0 disable

1 enable

Bit[19] Global Volume Enable

0 disable

1 enable

Bit[18:16] reserved

Bit[15:14] (FMC) FM modulation control bits.

00: FMA = (FMS * SIN) >> 3

01: FMA = (FMS * SIN) >> 2

10: FMA = (FMS * SIN) >> 1

11: FMA = (FMS * SIN) >> 0

Bit[13:7] (RVOL) Reverb Send Linear Volume

format: 1.6, 7Fh stands for 2x gain, 40h stands for no gain no

attenuation, 00h stands for mute.

Bit[6:0] (CVOL) Chorus Send Linear Volume

format: 1.6, 7Fh stands for 2x gain, 40h stands for no gain no

attenuation, 00h stands for mute.

3.4.9.29 F0h_A (Bank A GVSEL & PAN & VOL & CTRL

& Ec) (for Bank A only)

This register can be accessed in index mode or direct ac-

cess mode.

Address:

AudioBase + F0h (index mode) || Audio MEM

Base + 810h + 20h*CIR (direct access mode,

CIR: channel index) (CIR<32)

Size:

32 bits

Type:

Read/Write

Default:

XXXXXXXXh

Description: GVSEL — Global Volume Select (1 bit)

PAN — Positioning Attenuation (7 bits)

VOL — Volume Attenuation (8 bits)

CTRL — Control (4 bits)

Ec — Curent Envelope (12 bit)

Bit 31 (GVSEL) is global volume select bit.

0: select MUSICVOL

1: select WAVEVOL

Bits 30–24 (PAN) is Positioning attenuation control.

Bit 30 selects attenuated channel.

0: left,

1: right.

Bits 29–24 is the attenuation value in format of 4.2. 3Fh

stand for mute.

Bits 23–16 (VOL) is channel volume attenuation in format of

5.3. 00h stands for 0 dB attenuation, FFh stands for mute.

Bits 15–12 are control bits.

Bit 15 selects 8/16 bit sample data

0: 8-bit data

1: 16-bit data

Bit 14 selects mono/stereo sample data

0: mono

1: stereo

Bit 13 selects unsigned/signed sample data

0: unsigned

1: signed

Bit 12 is loop mode enable bit.

0: disable

1: enable

Bit 11–0 (Ec) is current envelope in format of 6.6 (Six bits in-

teger and six bits fraction). 00h stands for 0 dB, FFh stands

for −63.984375 dB.

3.4.9.30 F0h_B (Bank B GVSEL & PAN & VOL & CTRL

& Bank A LFO_INIT)

This register can be accessed in index mode or direct ac-

cess mode.

Address:

AudioBase + F0h (index mode) || Audio MEM

Base + 810h + 20h*CIR (direct access mode,

CIR: channel index) (CIR<32)

Size:

32 bits

Type:

Read/Write

Default:

XXXXXXXXh

Description: GVSEL — Global Volume Select (1 bit)

PAN — Positioning Attenuation (7 bits)

VOL — Volume Attenuation (12 bits)

CTRL — Control (4 bits)

LFO_INIT — Bank A per channel LFO counter

initial and reload value(8 bit)

Bit 31 (GVSEL) is global volume select bit.

0: select MUSICVOL

1: select WAVEVOL

Bits 30–24 (PAN) is Positioning attenuation control.

Bit 30 selects attenuated channel.

0: left,

1: right.

Bits 29–24 is the attenuation value in format of 4.2. 3Fh

stand for mute.

Bits 23–16 (LFO_INIT) is Bank A per channel LFO counter

initial and reload value.

Note: Any time when host write to RegECh[26:16] (LFO_CT), LFO_INIT

should be written with the same value.

Bits 15–12 are control bits.

Bit 15 selects 8/16 bit sample data

0: 8-bit data

1: 16-bit data

Bit 14 selects mono/stereo sample data

0: mono

1: stereo

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