F65510

Manufacturer Part NumberF65510
DescriptionControllers, Flat Panel VGA Controller
ManufacturerIntel Corporation
F65510 datasheet
 


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Page 84/154:

Interrupt Output Function

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®
EMULATION MODE REGISTER (XR14)
Read/Write at I/O Address 3B7h/3D7h
Index 14h
D7 D6 D5 D4 D3 D2 D1 D0
Emulation Mode
Herc Config (read only)
DE Status Mode
V Retrace Status Mode
Vsync Status Mode
Interrupt Polarity
1-0
Emulation Mode
00 VGA mode (default on Reset)
01 CGA mode
10 MDA/Hercules mode
11 EGA mode
3-2
Hercules Configuration Register (3BFh)
readback (read only)
4
Display Enable Status Mode
0 Select Display Enable status to appear
at bit 0 of Input Status register 1 (I/O
Address 3BAh/3DAh) (default on
reset).
Normally used for CGA,
EGA, and VGA modes.
1 Select Hsync status to appear at bit 0
of Input Status register 1 (I/O Address
3BAh/3DAh).
MDA / Hercules mode.
5
Vertical Retrace Status Mode
0 Select Vertical Retrace status to appear
at bit 3 of Input Status register 1 (I/O
Address 3BAh/3DAh) (default on
Reset).
Normally used for CGA,
EGA, and VGA modes.
1 Select Video to appear at bit 3 of Input
Status
register
3BAh/3DAh).
MDA / Hercules mode.
Revision 0.7
6
7
Interrupt State
Disabled
Enabled, Inactive 3-state
Enabled, Active
Normally used for
1
(I/O
Address
Normally used for
80
Extension Registers
VSync Status Mode
0 Prevent Vsync status from appearing
at bit 7 of Input Status Register 1 (I/O
Address 3BAh/3DAh).
used for CGA, EGA, and VGA
modes.
1 Enable Vsync status to appear as bit-7
of Input Status Register 1 (I/O
Address 3BAh/3DAh).
used for MDA/Hercules mode.

Interrupt Output Function

This bit controls the function of the interrupt
output pin (IRQ):
bit-7=0 bit-7=0
PC Bus MC Bus
3-state
3-state
3-state
3-state
Low
Preliminary 65510
Normally
Normally
bit-7=1
Either Bus
3-state
Low
High