Intel CONTROLLERS 413808 Developer's Manual page 201

Controllers in tper mode
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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 - X ) — I n t e l
2 . 1 4 . 6 2 O f f s e t E D h : H S _ N X T P - N e x t I t e m P o i n t e r
B y d e f a u l t , t h e C o m p a c t P C I c a p a b i l i t y i s t h e l a s t c a p a b i l i t i e s l i s t f o r t h e 4 1 3 8 x x , t h u s
t h i s r e g i s t e r d e f a u l t s t o 0 0 H .
H o w e v e r , t h i s r e g i s t e r m a y b e w r i t t e n t o 9 0 H p r i o r t o h o s t c o n f i g u r a t i o n t o i n c l u d e t h e
V P D c a p a b i l i t y l o c a t e d a t o f f - s e t 9 0 H .
W r i t i n g t h i s r e g i s t e r t o a n y v a l u e o t h e r t h a n 0 0 H ( d e f a u l t ) o r 9 0 H i s n o t s u p p o r t e d a n d
W a r n i n g :
m a y p r o d u c e u n p r e d i c t a b l e s y s t e m b e h a v i o r .
I n o r d e r t o i n s u r e t h a t t h i s r e g i s t e r i s w r i t t e n p r i o r t o h o s t c o n f i g u r a t i o n , t h e 4 1 3 8 x x
m u s t b e i n i t i a l i z e d a t
P C S R ) . T y p i c a l l y , t h e I n t e l X S c a l e
f o l l o w i n g
2 . 1 4 . 4 1 , " P C I C o n f i g u r a t i o n a n d S t a t u s R e g i s t e r - P C S R " o n p a g e 1 7 8
o n t h e 4 1 3 8 x x i n i t i a l i z a t i o n m o d e s .
T a b l e 8 9 .
H S _ N X T P - N e x t I t e m P o i n t e r
R e g i s t e r O f f s e t
+ 0 E 9 H
B i t
D e f a u l t
0 7 : 0 0
E 8 H
O c t o b e r 2 0 0 7
O r d e r N u m b e r : 3 1 7 8 0 5 - 0 0 1 U S
®
4 1 3 8 0 8 a n d 4 1 3 8 1 2
P _ R S T #
a s s e r t i o n t o R e t r y T y p e 0 c o n f i g u r a t i o n c y c l e s ( b i t 2 o f
P _ R S T #
a s s e r t i o n i n t h i s c a s e ( b i t 1 o f P C S R ) , a s w e l l . P l e a s e s e e
IOP
Attributes
PCI
Attributes
N e x t C a p a b i l i t i e s P o i n t e r ( P T R ) :
S i n c e t h e c P C I c a p a b i l i t i e s a r e t h e l a s t i n t h e l i n k e d l i s t o f e x t e n d e d c a p a b i l i t i e s i n t h e 4 1 3 8 x x , t h e
r e g i s t e r i s s e t t o 0 0 H .
H o w e v e r , t h i s f i e l d m a y b e w r i t t e n p r i o r t o h o s t c o n f i g u r a t i o n w i t h 9 0 H t o e x t e n d t h e l i s t t o i n c l u d e
t h e V P D e x t e n d e d c a p a b i l i t i e s h e a d e r .
®
p r o c e s s o r w o u l d b e e n a b l e d t o b o o t i m m e d i a t e l y
7
4
0
rw
rw
rw
rw
rw
rw
rw
rw
ro
ro
ro
ro
ro
ro
ro
ro
A t t r i b u t e L e g e n d :
R V = R e s e r v e d
R W = R e a d / W r i t e
R O = R e a d O n l y
D e s c r i p t i o n
®
I n t e l
4 1 3 8 0 8 a n d 4 1 3 8 1 2 I / O C o n t r o l l e r s i n T P E R M o d e
S e c t i o n
f o r m o r e d e t a i l s
R T = R e a d / T o g g l e
R C = R e a d / C l e a r
S W = S R O M W r i t e
N A = N o t A c c e s s i b l e
D e v e l o p e r ' s M a n u a l
2 0 1

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