MX86251 데이터 시트보기 (PDF) - Macronix International

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MX86251

3D graphic chipset

Macronix International 

MD6: DIFFIDEN. Bit 3 of register 3?5/3FH.

0--PCI bus device ID is read as "8626"

1--If 3DFX is detected, PCI device ID is read as

"8627" Otherwise read as"8626".

MD7: PUMA. Bit 0 of register 3?5/28H.

0--PUMA off (default 250MD)

1--PUMA on.

Issue request for MD bus from 3DFX to execute ROM

cycle. PUMA on/off also can be programmed by software

at 3D4/28 bit 0.

MD[11:10]:Reserved

MD12: EXTMCLK

0--Use internal MCLK

1--Use external MCLK

MD13: Reserved

MD[15:14]: Reserved.

MD20: DEBUGMD. Bit 0 of register 3?5/31H.

0--Disable debug mode.

1--Enable debug mode.

PFXSWAP: EN3DFX. Bit 2 of register 3?5/3FH

0--3DFX connected

1--3DFX disconnected

MX86251

P/N:PM0476

REV. 1.2 , FEB 11, 1998

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