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參數(shù)資料
型號(hào): W83787F
廠商: WINBOND ELECTRONICS CORP
英文描述: WINBOND I/O WITH SERIAL-INFRARED SUPPORT
中文描述: 華邦的I /串行O型紅外線支持
文件頁數(shù): 52/123頁
文件大小: 1751K
代理商: W83787F
W83787IF
Publication ReleaseDate:Sep 1995
- 52 -
Revision A1
5.3.2 Data and ecpAFifo Port
Modes 000 (SPP) and 001 (PS/2) (Data Port)
During a write operation, the Data Register latches the contents of the data bus on the rising edge of
the input. The contents of this register are output to the PD0-PD7 ports. During a read operation,
ports PD0-PD7 are read and output to the host. The bit definitions are as follows:
7 6 5 4 3 2 1 0
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
Mode 011 (ECP FIFO-Address/RLE)
A data byte written to this address is placed in the FIFO and tagged as an ECP Address/RLE. The
hardware at the ECP port transmits this byte to the peripheral automatically. The operation of this
register is defined only for the forward direction. The bit definitions are as follows:
7 6 5 4 3 2 1 0
Address or RLE
Address/RLE
5.3.3 Device Status Register (DSR)
These bits are at low level during a read of the Printer Status Register. The bits of this status register
are defined as follows:
7 6 5 4 3 2 1 0
nFault
Select
PError
nAck
nBusy
1
1
1
Notes:
Bit 7: This bit reflects the complement of the Busy input.
Bit 6: This bit reflects the nAck input.
Bit 5: This bit reflects the PError input.
Bit 4: This bit reflects the Select input.
Bit 3: This bit reflects the nFault input.
Bit 2-0: These three bits are not implemented and are always logic one during a read.
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