P M E P e n d i n g : T h e r e a d - o n l y b i t i n d i c a t e s t h a t a n o t h e r P M E i s p e n d i n g w h e n t h e P M E S t a t u s b i t i s s e t .

W h e n t h e P M E S t a t u s b i t i s c l e a r e d b y s o f t w a r e ; t h e P M E i s d e l i v e r e d b y h a r d w a r e b y s e t t i n g t h e P M E

1 7

S t a t u s b i t a g a i n a n d u p d a t i n g t h e R e q u e s t e r I D a p p r o p r i a t e l y .

T h e A T U o n l y s u p p o r t s a s i n g l e P M E a t a t i m e . T h i s b i t h a r d - w i r e d t o 0 .

P M E S t a t u s : T h i s b i t i n d i c a t e t h a t P M E w a s a s s e r t e d b y t h e r e q u e s t o r I D i n d i c a t e d i n t h e P M E r e q u e s t o r

I D f i e l d .

1 6

S u b s e q u e n t P M E s a r e d r o p p e d u n t i l t h e s t a t u s r e g i s t e r i s c l e a r e d b y s o f t w a r e b y w r i t i n g a 1 t o t h i s b i t .

P M E R e q u e s t o r I D

1 5 : 0

0 0 0 0 H

T h i s f i e l d i n d i c a t e s t h e P C I r e q u e s t o r I D o f t h e f i r s t P M E r e q u e s t o r .

I n t e l

8 1 3 4 1 a n d 8 1 3 4 2 I / O P r o c e s s o r s

D e v e l o p e r ' s M a n u a l

3 5 8

I n t e l

8 1 3 4 1 a n d 8 1 3 4 2 — A d d r e s s T r a n s l a t i o n U n i t ( P C I E x p r e s s )

A t t r i b u t e L e g e n d :

R Z = R e s e r v e d Z e r o

P R = P r e s e r v e d

R S = R e a d / S e t

D e s c r i p t i o n

R W = R e a d / W r i t e

R C = R e a d C l e a r

R O = R e a d O n l y

N A = N o t A c c e s s i b l e

D e c e m b e r 2 0 0 7

O r d e r N u m b e r : 3 1 5 0 3 7 - 0 0 2 U S

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