W83877TF Datasheet, PDF (61/154 Pages) Winbond – I/O chip disk drive adapter

W83877TF
7 6543 21 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 32 1 0
Address or RLE
Address/RLE
4.3.3 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 65 43 2 1 0
11 1
nFault
Select
PError
nAck
nBusy
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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Publication Release Date: March 1998
Version 0.61