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W83877F

WINBOND I/O

Winbond 

W83877F

1.3 Game Port/Power Down Interface

If Bit 3 of CR16 (GMDRQ) is 1, Bit 4 of CR3 (GMODS0) determines whether the game port is in

Adapter mode or Portable mode (default is Adapter mode). If Bit 3 of CR16 is 0, pin 39 and 41 are

used for DMA A operation.

SYMBOL PIN

I/O

FUNCTION

GMRD

PFDCEN

DACK_ A

41 OUT8t When CR16 Bit 3 (GMDRQ) = 1:

OUT8t Adapter mode: Game port read control signal.

OUT8t

Portable mode: When parallel port is selected as Extension

FDD/Extension 2FDD mode, this pin will be active. The active

state is dependent on bit 7 of CRA (PFDCACT), and default is

low active.

When CR16 Bit 3 (GMDRQ) = 0:

DMA acknowledge signal A.

GMWR

PEXTEN

39 OUT8t When CR16 Bit 3 (GMDRQ) = 1:

OUT8t Adapter mode: Game port write control signal.

Portable mode: When a particular extended mode is selected for

the parallel port, this pin will be active. The extended modes

include Extension Adapter mode, EPP mode, ECP mode, and

ECP/EPP mode, which are selected using bit 3 - bit 0 of CRA.

The active state is dependent on bit 6 of CRA (PEXTACT); the

default is low active.

DRQ_A

When CR16 Bit 3 (GMDRQ) = 0:

INt

DMA request signal A.

PDCIN

3

INc This input pin controls the chip power down. When this pin is

active, the clock supply to the chip will be inhibited and the

output pins will be tri-stated as defined in CR4 and CR6. The

PDCIN is pulled down internally. Its active state is defined by bit

4 of CRA (PDCHACT). Default is high active.

-8-

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