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W83977EF-AW Datasheet(PDF) 62 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 62 Page - Winbond |
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62 / 142 page  W83977EF-AW/W83977EG-AW -60- 7.3.2 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 7.3.3 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 11 |
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