- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358865 > LM4560 (National Semiconductor Corporation) Advanced PCI Audio Accelerator PDF資料下載
參數(shù)資料
| 型號： | LM4560 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Advanced PCI Audio Accelerator |
| 中文描述： | 先進(jìn)的PCI音頻加速器 |
| 文件頁數(shù)： | 31/54頁 |
| 文件大?。?/td> | 380K |
| 代理商： | LM4560 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁當(dāng)前第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁
3.0 Register Description
(Continued)
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 (VOL) is channel volume attenuation in format of
6.6. 000h stands for 0 dB attenuation, FFFh stands for mute.
3.4.9.31 F4h_A (EBUF1) (Bank A Only)
This register can be accessed in index mode or direct ac-
cess mode.
Address:
AudioBase + F4h (index mode) || Audio MEM
Base + 814h + 20h*CIR (direct access mode,
CIR: channel index) (CIR
<
32)
Size:
32 bits
Type:
Read/Write
Default:
XXXXXXXXh
Description:
Envelope Buffer 1
This register and next one provide envelope double buffer.
Bit 31–30 (AMS_H) is Amplitude Modulation Step High part.
Bits 29–28 (EMOD) define operation mode.
00: DEC mode (ramp from 0 dB to 64 dB)
In this mode, bits 7–0 of this register are used as ECNT
which stores current state of a 8-bit counter; bits 15–8 of this
register are used as EINIT which provides initial value of that
8-bit counter; bits 27–16 of this register are used as EAMT
which is the absolute ramping amount with range from 0 dB
to 63 and 63/64 dB. Every 48 kHz clock, ECNT decrease 1;
every time when ECNT=00h, it reload EINIT, EAMT de-
crease 1, and Ec decrease 1; every time when EAMT=00h,
envelope engine will toggle buffer flag in global register
CEBC.
01: INC mode ( ramp from 64 dB to 0 dB )
4.0 Functional Description
In this mode, the layout of this register is completely the
same as in DEC mode. Engine works in the same way ex-
cept that the ramp direction is from 64 dB to 0 dB.
10: Delay mode
In this mode, bits 27–26 are used to select sub-mode:
00: Delay_hold
01: Delay_start
10: Delay_stop
11: reserved
19–0 is used as EDLY which store the current state of a 20-
bit delay counter, bits 25–20 are of no use. Every 48 kHZ
clock, EDLY decrease 1. During all the time this buffer active,
Ec keep unchanged.
In Delay_hold sub-mode, when EDLY =00000h, engine will
toggle current buffer flag in global register CEBC.
In Delay_start sub-mode, when EDLY =00000h, engine will
reset DLY flag register.
In Delay_stop sub-mode, when EDLY =00000h, engine will
reset start/stop flag register.
11: Still mode
In this mode, Ec keep unchanged, buffer never toggle auto-
matically. Only when CEBC is written, buffer may toggle.
3.4.9.32 F8h_A (EBUF2) (Bank A Only)
This register can be accessed in index mode or direct ac-
cess mode.
Address:
AudioBase + F8h (index mode) || Audio MEM
Base + 818h + 20h*CIR (direct access mode,
CIR: channel index) (CIR
<
32)
Size:
32 bits
Type:
Read/Write
Default:
XXXXXXXXh
Description:
Envelope Buffer 2
EBUF2 is totally as the same as EBUF1 except that bits
31–30 are AMS_L (Amplitude Modulation Step Low part).
DS100910-1
FIGURE 2. LM4560 Block Diagram
www.national.com
31
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM45BIM3 | SOT-23 Precision Centigrade Temperature Sensors |
| LM45BIM3X | SOT-23 Precision Centigrade Temperature Sensors |
| LM45B | SOT-23 Precision Centigrade Temperature Sensors |
| LM4610 | Dual DC Operated Tone/Volume/Balance Circuit with National 3-D Sound |
| LM4610N | Dual DC Operated Tone/Volume/Balance Circuit with National 3-D Sound |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4560VJD | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM4562 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual High Performance, High Fidelity Audio Operational Amplifier |
| LM4562_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual High Performance, High Fidelity Audio Operational Amplifier |
| LM4562HA | 制造商:Texas Instruments 功能描述:OP Amp Dual GP ??17V 8-Pin TO-99 Tray |
| LM4562HA/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。