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參數(shù)資料
型號(hào): W83697F
廠商: WINBOND ELECTRONICS CORP
英文描述: WINBOND I/O
中文描述: 華邦的I / O
文件頁數(shù): 84/167頁
文件大小: 1094K
代理商: W83697F
W83697HF/F
Publication Release Date: Feb. 2002
Revision 0.70
- 75 -
Bit 4: Read/Write (Valid only in ECP Mode)
1
Disables the interrupt generated on the asserting edge of nFault.
0
Enables an interrupt pulse on the high to low edge of nFault. If nFault is asserted
(interrupt) an interrupt will be generated and this bit is written from a 1 to 0.
Bit 3: Read/Write
1
Enables DMA.
0
Disables DMA unconditionally.
Bit 2: Read/Write
1
Disables DMA and all of the service interrupts.
0
Enables one of the following cases of interrupts. When one of the service interrupts
has occurred, the serviceIntr bit is set to a 1 by hardware. This bit must be reset to 0
to re-enable the interrupts. Writing a 1 to this bit will not cause an interrupt.
(a) dmaEn = 1: During DMA this bit is set to a 1 when terminal count is reached.
(b) dmaEn = 0 direction = 0: This bit is set to 1 whenever there are writeIntr Threshold
or more bytes free in the FIFO.
(c) dmaEn = 0 direction = 1: This bit is set to 1 whenever there are readIntr Threshold
or more valid bytes to be read from the FIFO.
Bit 1: Read only
0
The FIFO has at least 1 free byte.
1
The FIFO cannot accept another byte or the FIFO is completely full.
Bit 0: Read only
0
The FIFO contains at least 1 byte of data.
1
The FIFO is completely empty.
6.3.11 Bit Map of ECP Port Registers
D7
PD7
D6
PD6
D5
PD5
D4
PD4
D3
PD3
D2
PD2
D1
PD1
D0
PD0
NOTE
data
ecpAFifo
dsr
dcr
cFifo
ecpDFifo
tFifo
cnfgA
cnfgB
ecr
Addr/RLE
nBusy
Address or RLE field
nAck
2
1
PError
Select
nFault
1
1
1
1
1
Directio
ackIntEn
SelectIn
nInit
autofd
strobe
1
2
2
Parallel Port Data FIFO
ECP Data FIFO
Test FIFO
0
2
0
0
1
0
0
0
0
compress
intrValue
MODE
1
1
1
1
1
full
1
nErrIntrEn
dmaEn
serviceIntr
empty
Notes:
1. These registers are available in all modes.
2. All FIFOs use one common 16-byte FIFO.
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