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参数资料
| 型号： | YMF724 |
| 厂商： | Yamaha Corporation |
| 英文描述： | high performance audio controller for the PCI Bus |
| 中文描述： | 高性能音频控制器的PCI总线 |
| 文件页数： | 32/50页 |
| 文件大小： | 268K |
| 代理商： | YMF724 |
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YMF724F
January 14, 1999
-38-
3. DMA Emulation Protocol
The former synthesizer LSI for the ISA bus such as the Sound Blaster used the DMA controller (8237: ISA
DMAC) on the system to transfer the sound data from/to the host.
For DS-1, however, ISA DMAC must be used to transfer the sound data to the Sound Blaster Pro Block of
the Legacy Audio Block.
Because signals to connect to the ISA DMAC are generally not available on the PCI bus, there are two ways
proposed from the industry to emulate the ISA DMAC on the PCI bus. One is PC/PCI and the other is D-
DMA.
DS-1 supports both protocols for transferring SB Pro sound data on the PCI bus.
3-1. PC/PCI
DS-1 provides two signals, PCREQ# and PCGNT# to realize the PC/PCI.
The format of the signals is
shown below.
DS-1 asserts PCREQ# and sets PCREQ# to “HIGH” using the PCICLK corresponding to the
DMA channel it is going to use.
In addition, DS-1 determines whether the next PCI I/O cycle is its own from the channel information that is
encoded in PCGNT#.
start
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
start
bit0
bit1
bit2
0ns
100ns
200ns
300ns
400ns
PCICLK
REQ#
GNT#
PCGNT# is encoded as follows.
GNT# Encoding
bit2
bit1
bit0
GNT# Bits
00
0
DMA Channel 0
00
1
DMA Channel 1
01
0
DMA Channel 2
01
1
DMA Channel 3
10
0
Reserved
10
1
DMA Channel 5
11
0
DMA Channel 6
11
1
DMA Channel 7
DS-1 supports only 8-bit DMA channels (DMA Channel 0-3).
It also only supports Single DMA transfer.
相关PDF资料 |
PDF描述 |
|---|---|
| YMF724F | high performance audio controller for the PCI Bus |
| YMF724F-V | high performance audio controller for the PCI Bus |
| YMF740C | DS-1L |
| YMF743-S | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| YMF743 | AC97 Revsion2.1 Audio CODEC with Digital Audio I/F(AC97 2.1版音频编解码器（带数字音频接口）) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| YMF724F | 制造商:YAMAHA 制造商全称:YAMAHA CORPORATION 功能描述:high performance audio controller for the PCI Bus |
| YMF724F-V | 制造商:YAMAHA 制造商全称:YAMAHA CORPORATION 功能描述:high performance audio controller for the PCI Bus |
| YMF740C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DS-1L |
| YMF740CV | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC |
| YMF743 | 制造商:YAMAHA 制造商全称:YAMAHA CORPORATION 功能描述:AC’97 Revsion2.1 Audio CODEC with Digital Audio I/F |
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