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參數(shù)資料
| 型號： | LM4560VJD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Advanced PCI Audio Accelerator |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, TQFP-100 |
| 文件頁數(shù)： | 45/54頁 |
| 文件大?。?/td> | 380K |
| 代理商： | LM4560VJD |
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4.0 Functional Description
(Continued)
E2h command is used to compute the subroutine’s starting address for digital sound playback or recording according to the dedi-
cated algorithm. The resultant byte should be sent back to system memory via legacy DMA operation method (two bytes trans-
ferred in all). After E2h is received, ESP will be set busy if E2Status (source from wave engine) is set active.
4.2.1.14.4 Command E4h
Function: Send Test Byte for Command E8h
4.2.1.14.5 Command E8h
Function: Get Test Byte Sent by Command E4h
4.2.1.15 SB ESP Testing Command FXh
4.2.1.15.1 Command F2h
Function: Generate an interrupt for test
SB ESP will generate an interrupt immediately after this command.
4.2.1.15.2 Command F8h
Function: SB ESP data read test
4.2.1.16 Digitized Sound Data Format and Order
4.2.1.16.1 PCM Sound Data Format
Length
8 Bit
8 Bit
16 Bit
16 Bit
Format
Unsigned FFh
Signed
Unsigned FFFFh
Signed
Max. Value
Min. Value
Mid. Value
0h
80h
7Fh
80h
0h
0h
8000h
7FFFh
8000h
0h
4.2.1.16.2 PCM Sound Data Order
4.2.1.16.2.1 8-Bit Mono
N
PCM 0
N+1
PCM 1
N+2
PCM 2
N+3
PCM 3
N+4
PCM 4
4.2.1.16.2.2 8-Bit Stereo for 1xh and 9xh Type Command
2N
PCM 0.R
2N+1
PCM 0.L
2(N+1)+0
PCM 1.R
2(N+1)+1
PCM 1.L
2(N+2)+0
PCM 2.R
4.2.1.16.2.3 8-BIT STEREO FOR CXH TYPE COMMAND
2N
PCM 0.L
2N+1
PCM 0.R
2(N+1)+0
PCM 1.L
2(N+1)+1
PCM 1.R
2(N+2)+0
PCM 2.L
4.2.1.16.2.4 16-Bit Mono
2N
LOW
PCM 0
2N+1
HIGH
PCM 0
2(N+1)+0
LOW
PCM 1
2(N+1)+1
HIGH
PCM 1
2(N+2)+0
LOW
PCM 2
4.2.1.16.2.5 16-Bit Stereo
4N
LOW
PCM 0.L
4N+1
HIGH
PCM 0.L
4N+2
LOW
PCM 0.R
4N+3
HIGH
PCM 0.R
4(N+1)+0
LOW
PCM 1.L
4.2.1.17 Legacy Sound Blaster Mixer Register
The legacy SB mixer register are accessed through indirect addressing method, where the SBR4 stores the index of addressed
register and SBR5 stores the register content to be read/write. In the following description, MXxx represents a mixer register
whose index is xx.
www.national.com
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