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)： 38/54頁
文件大小： 380K
代理商： LM4560VJD
4.0 Functional Description
(Continued)
Table CODEC Buffer Partitioning
4.1.10 Legacy Channel Playback/Recording
This function block is intended to emulate legacy DMA using PCI bus master engine.
All parameters used by this Legacy Channel are stored in register.
TABLE 1. LBL (Legacy Burst Length)
LBL CA[1:0]
SB_Data_type[2:1]=00
SB_Data_type[2:1]=01
SB_Data_type[2:1]=10
SB_Data_type[2:1]=11
00
1
1
1
2
01
1
2
2
3
10
1
2
2
3
11
2
2
2
3
TABLE 2. LBL1 (Legacy Burst Length)
LBL1 BA[1:0]
SB_Data_type[2:1]=00
SB_Data_type[2:1]=01
SB_Data_type[2:1]=10
SB_Data_type[2:1]=11
00
1
1
1
1
01
1
1
1
2
10
1
1
1
2
11
1
2
2
2
4.2 LEGACY AUDIO
The legacy Audio includes the SB Engine, OPL3 trapping, MPU-401 interface and Gameport.
4.2.1 SB Engine
4.2.1.1 Legacy SB ESP I/O Procedure
4.2.1.1.1 SB ESP Read Data Procedure
4.2.1.1.2 SB ESP Write Procedure
4.2.1.1.3 SB ESP Reset Procedure
4.2.1.1.4
4.2.1.1.5 Legacy SB Interrupt Acknowledge Procedure
4.2.1.2 Legacy Sound Blaster Compatible Digitized Sound Transfer Method
4.2.1.2.1 Direct Mode
SB ESP is programmed to do audio input/output on each command. All delay time is controlled by CPU delay loop or timer in-
terrupt. Only 8-bit mono input/output is supported.
Input:
a. ESP_Write(20h)
b. Next 8-bit mono PCM = ESP_Read()
c. Wait until next sample time, go to a.
4.2.1.2.2 DMA Mode
Normal DMA Mode
SB ESP is programmed to make one transfer with a
specified block size. At the end of transfer, the SB ESP
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