W83977EF-AW datasheet(63/142 Pages) WINBOND

Part #	W83977EF-AW

Description	WINBOND ISA I/O

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W83977EF-AW/W83977EG-AW

Publication Release Date: Apr. 2006

-61-

Revision 1.2

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.

7.3.4

Device Control Register (DCR)

The bit definitions are as follows:

7

6

5

4

3

2

1

0

11

strobe

autofd

nInit

SelectIn

ackIntEn

Direction

Bit 6, 7: These two bits are logic one during a read and cannot be written.

Bit 5: This bit has no effect and the direction is always out if mode = 000 or mode = 010. Direction is

valid in all other modes.

0

the parallel port is in output mode.

1

the parallel port is in input mode.

Bit 4: Interrupt request enable. When this bit is set to a high level, it may be used to enable interrupt

requests from the parallel port to the CPU due to a low to high transition on the

ACK# input.

Bit 3: This bit is inverted and output to the SLIN# output.

0

The printer is not selected.

1

The printer is selected.

Bit 2: This bit is output to the

INIT# output.

Bit 1: This bit is inverted and output to the

AFD# output.

Bit 0: This bit is inverted and output to the

STB# output.

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W83977EF-AW Datasheet(PDF) 63 Page - Winbond

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