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參數(shù)資料
| 型號： | AOP-12D |
| 英文描述： | 12 CHANNEL DIGITAL TO ANALOGUE |
| 中文描述： | 12通道數(shù)模 |
| 文件頁數(shù)： | 46/49頁 |
| 文件大?。?/td> | 227K |
| 代理商： | AOP-12D |
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Page 40
Appendix C
Page 40
01270146.doc
Blue Chip Technology Ltd.
Clear Byte Pointer Flip Flop
Port 0CH
Any write to this port resets the byte pointer flip flop. This ensures that the first
write to the Start Address or Transfer Length registers will go into the LSB of
that register.
DMA Transfer Start Address
Ports 00H, 02H, 04H, 06H
Sets the 16 bit start address for the DMA transfer, send LS Byte first.
Transfer Length
Ports 01H, 03H, 05H, 07H
Sets the 16 bit length of the DMA transfer, send LS Byte first.
Page Register
Ports 83H, 81H, 82H
Sets the upper eight bits of the physical memory address of the DMA transfer.
Addressing
In order for DMA to operate correctly the page register and start address
register should be set-up to inform the DMA controller where in memory the
transfer is to take place.
The INTEL x86 family of microprocessors address memory using 2 address
pointers called SEGMENT and OFFSET, this is called a LOGICAL address.
The microprocessor combines the SEGMENT and OFFSET to produce a
PHYSICAL address which it uses to access the memory.
If we consider a PC which has 1Mbyte of memory, each memory location will
have a PHYSICAL address of 0 to 1048575 (or 0 to FFFFF
Hex
).
It has a LOGICAL range of 0000:0000 to F000:FFFF. The colon is commonly
used to separate the SEGMENT address from the OFFSET address
(Segment:Offset)
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