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參數(shù)資料
| 型號： | 82C237 |
| 廠商： | Intersil Corporation |
| 英文描述： | CMOS High Performance Programmable DMA Controller |
| 中文描述： | 高性能的CMOS可編程DMA控制器 |
| 文件頁數(shù)： | 14/25頁 |
| 文件大?。?/td> | 158K |
| 代理商： | 82C237 |
4-161
82C237
CHANNEL
REGISTER
OPERATION
SIGNALS
FIRST/LAST
FLIP-FLOP
STATE
DATA
BUS
DB0-DB7
CS
IOR
IOW
A3
A2
A1
A0
0
Base and Current Address
Write
0
1
0
0
0
0
0
0
A0-A7
0
1
0
0
0
0
0
1
A8-A15
Current Address
Read
0
0
1
0
0
0
0
0
A0-A7
0
0
1
0
0
0
0
1
A8-A15
Base and Current Word
Count
Write
0
1
0
0
0
0
1
0
W0-W7
0
1
0
0
0
0
1
1
W8-W15
Current Word Count
Read
0
0
1
0
0
0
1
0
W0-W7
0
0
1
0
0
0
1
1
W8-W15
1
Base and Current Address
Write
0
1
0
0
0
1
0
0
A0-A7
0
1
0
0
0
1
0
1
A8-A15
Current Address
Read
0
0
1
0
0
1
0
0
A0-A7
0
0
1
0
0
1
0
1
A8-A15
Base and Current Word
Count
Write
0
1
0
0
0
1
1
0
W0-W7
0
1
0
0
0
1
1
1
W8-W15
Current Word Count
Read
0
0
1
0
0
1
1
0
W0-W7
0
0
1
0
0
1
1
1
W8-W15
2
Base and Current Address
Write
0
1
0
0
1
0
0
0
A0-A7
0
1
0
0
1
0
0
1
A8-A15
Current Address
Read
0
0
1
0
1
0
0
0
A0-A7
0
0
1
0
1
0
0
1
A8-A15
Base and Current Word
Count
Write
0
1
0
0
1
0
1
0
W0-W7
0
1
0
0
1
0
1
1
W8-W15
Current Word Count
Read
0
0
1
0
1
0
1
0
W0-W7
0
0
1
0
1
0
1
1
W8-W15
3
Base and Current Address
Write
0
1
0
0
1
1
0
0
A0-A7
0
1
0
0
1
1
0
1
A8-A15
Current Address
Read
0
0
1
0
1
1
0
0
A0-A7
0
0
1
0
1
1
0
1
A8-A15
Base and Current Word
Count
Write
0
1
0
0
1
1
1
0
W0-W7
0
1
0
0
1
1
1
1
W8-W15
Current Word Count
Read
0
0
1
0
1
1
1
0
W0-W7
0
0
1
0
1
1
1
1
W8-W15
FIGURE 6. WORD COUNT AND ADDRESS REGISTER COMMAND CODES
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