參數(shù)資料
型號(hào)： a8237
廠商： Altera Corporation
英文描述： programmable DMA Controller(可編程DMA控制器)
中文描述： 可編程DMA控制器（可編程DMA的控制器）
文件頁(yè)數(shù)： 11/22頁(yè)
文件大小： 269K
代理商： A8237
Altera Corporation
15
a8237 Programmable DMA Controller Data Sheet
Temporary Register
The 8-bit temporary register holds the data value for memory-to-memory
DMA transfers. Reading this register from the microprocessor via
dbout[7..0]
yields the last data value transferred during the most recent
memory-to-memory DMA cycle. The temporary register cannot be
written to directly by the microprocessor via
dbin[7..0]
, but can be
cleared by the
reset
input or a master clear command.
Commands
The
a8237
MegaCore function can perform the following commands:
I
I
I
I
I
I
I
Single request bit command
Single mask bit command
Clear byte pointer command
Set byte pointer command
Master clear command
Clear mask register command
Clear mode register counter command
These commands are issued by performing either a read or write
operation with a specific address on
ain[3..0]
.
Table 2 on page 9
shows
how to issue these commands.
Table 7. Status Register Format
Bit
Description
0
1
2
3
4
5
6
7
Channel 0 terminal count
Channel 1 terminal count
Channel 2 terminal count
Channel 3 terminal count
Channel 0 request
Channel 1 request
Channel 2 request
Channel 3 request
相關(guān)PDF資料
PDF描述
A8237 PROGRAMMABLE DMA CONTROLLER
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a8259 Programmable Interrupt Controller(可編程中斷控制器)
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