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参数资料
| 型号： | YMF754-V |
| 厂商： | Yamaha Corporation |
| 英文描述： | DS-1E |
| 中文描述： | 副秘书长至1E |
| 文件页数： | 39/60页 |
| 文件大小： | 305K |
| 代理商： | YMF754-V |
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YMF754
June 28, 1999
-44-
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-1E, 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-1E supports both protocols for transferring SB Pro sound data on the PCI bus.
3-1. PC/PCI
DS-1E provides two signals, PCREQ# and PCGNT# to realize the PC/PCI.
The format of the signals is
shown below.
DS-1E asserts PCREQ# and sets PCREQ# to “HIGH” using the PCICLK corresponding to
the DMA channel it is going to use.
In addition, DS-1E 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-1E supports only 8-bit DMA channels (DMA Channel 0-3).
It also only supports Single DMA transfer.
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