Intel 815 manual ISR-Interrupt Status Register

Models: 815

1 423
Download 423 pages 44.71 Kb
Page 326
Image 326

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

16.2.5.ISR—Interrupt Status Register

Address Offset:

020ACh

Default Value:

0100h (probably still not quite correct value)

Access:

Read Only

Size:

16 bits

This register contains the non-persistent value of the signals causing each interrupt. These bits are not masked by the Interrupt Mask Register. The user interrupt and the breakpoint interrupt last for one clock pulse. The corresponding bits in this register will serve no practical purpose due to the short duration of the signal.

15

 

14

13

 

12

11

10

9

8

 

 

HW

 

Reserved

 

Sync

Pri Dply

Reserved

Overlay 0

Reserved

 

 

Detect

 

 

 

 

Status

Flip

 

Flip

 

 

 

Error

 

 

 

 

Toggle

Pending

 

Pending

 

 

 

Master

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

6

5

 

4

3

2

1

0

 

 

Pri Dply

Pri Dply

Reserved

 

Reserved

Reserved

Reserved

User

Breakpoint

 

 

VBLANK.

Event

 

 

 

 

 

Defined

 

 

 

 

 

 

 

 

 

 

 

Interrupt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

15:0

Interrupt Status. See Table 17.

 

 

 

 

 

 

1 = Signal caused interrupt.

326

Page 326
Image 326
Intel 815 manual ISR-Interrupt Status Register