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參數資料
型號: W90221F
廠商: WINBOND ELECTRONICS CORP
英文描述: PA-RISC Embedded Micro-Controller(惠普PA-RISC結構的32位嵌入式微控制器)
中文描述: PA - RISC的嵌入式微控制器(惠普的PA - RISC結構的32位嵌入式微控制器)
文件頁數: 99/174頁
文件大小: 2102K
代理商: W90221F
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The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from Winbond.
99
Versi on 0. 4, March/2000
In MOD0:
Bit21
DMA transfer fix mode(FIX)
1 = Set DMA transfer as rotate mode. In rotate mode, the DMA controller acknowledge
channel 1 request right after channel 0 being served. The channel 1 and channel 0 are served
by turns.
0 = DMA is set in fix mode. Channel 0 is the most privilege. The channel 1 will not get the
service token, unless channel 0 release the request.
Bit22
Bit23-31 Ready timeout counter(Tout)
Set IO device assert NOT ready timeout cycle count. When IO read/write command is issued,
and if the IO device inserts wait state by asserting IORDY, the ready timeout counter starts
to count. If the counter reach the Tout before read/write command is completed, the timeout
flag TO0 or TO1 is to be set.
In MOD1:
Bit 21 Set DACK0 low active(DACK0L)
1 = set DMA acknowledge signal DACK0 to low active
0 = set DMA acknowledge signal DACK0 to high active
Bit 22 Set DACK1 low active(DACK1L)
1 = set DMA acknowledge signal DACK1 to low active
0 = set DMA acknowledge signal DACK1 to high active
Bit 23 Set CS0 low active(CS0L)
1 = Set IO device chip select CS0 to low active
0 = Set IO device chip select CS0 to high active
Bit 24 Set CS1 low active(CS1L)
1 = Set IO device chip select CS1 to low active
0 = Set IO device chip select CS1 to high active
Bit 25 DACK1 active
1 = indicate DMA channel 1 acknoewledge DACK1 is active
Bit 26 Channel 0 time out(TO0)
Reserved
This bit should be set to 0.
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