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參數資料
| 型號： | LM4560 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Advanced PCI Audio Accelerator |
| 中文描述： | 先進的PCI音頻加速器 |
| 文件頁數： | 30/54頁 |
| 文件大?。?/td> | 380K |
| 代理商： | LM4560 |
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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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