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 ) — I n t e l
F i g u r e 3 5 . A T U I n t e r f a c e E x t e n d e d C o n f i g u r a t i o n H e a d e r F o r m a t ( M S I C a p a b i l i t y )
T h e f i r s t b y t e a t t h e E x t e n d e d C o n f i g u r a t i o n O f f s e t D 0 H i s t h e
C a p a b i l i t y I d e n t i f i e r R e g i s t e r - C a p _ I D " o n p a g e 4 2 9
C o n f i g u r a t i o n H e a d e r s p a c e a s t h e t y p e d e f i n e d b y t h e P C I L o c a l B u s S p e c i f i c a t i o n ,
R e v i s i o n 2 . 3 .
F o l l o w i n g t h e C a p a b i l i t y I d e n t i f i e r R e g i s t e r i s t h e s i n g l e b y t e N e x t I t e m P o i n t e r R e g i s t e r
w h i c h i n d i c a t e s t h e c o n f i g u r a t i o n o f f s e t o f a n a d d i t i o n a l 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 ,
w h e n s u p p o r t e d . I n t h e A T U , t h e N e x t I t e m P o i n t e r R e g i s t e r i s s e t t o D 0 H i n d i c a t i n g
t h a t t h e r e i s a n a d d i t i o n a l 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 s s u p p o r t e d i n t h e A T U s
c o n f i g u r a t i o n s p a c e .
F i g u r e 3 6 . A T U I n t e r f a c e E x t e n d e d C o n f i g u r a t i o n H e a d e r F o r m a t ( P C I E x p r e s s
C a p a b i l i t y )
T h e f i r s t b y t e a t t h e E x t e n d e d C o n f i g u r a t i o n O f f s e t D 0 H i s t h e P C I E x p r e s s C a p a b i l i t y
I d e n t i f i e r R e g i s t e r (
s p a c e a s t h e t y p e d e f i n e d b y t h e P C I E x p r e s s B a s e S p e c i f i c a t i o n , R e v i s i o n 1 . 0 a .
F o l l o w i n g t h e C a p a b i l i t y I d e n t i f i e r R e g i s t e r i s t h e s i n g l e b y t e N e x t I t e m P o i n t e r R e g i s t e r
(
S e c t i o n 3 . 1 7 . 5 6
C a p a b i l i t i e s H e a d e r , w h e n s u p p o r t e d . I n t h e A T U , t h e N e x t I t e m P o i n t e r R e g i s t e r i s s e t
t o 0 0 H b y d e f a u l t t o i n d i c a t e t h e r e a r e n o a d d i t i o n a l 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 s i n
t h e A T U s c o n f i g u r a t i o n s p a c e . S o f t w a r e c a n s e t t h i s p o i n t e r t o 9 0 H i n d i c a t i n g t h a t t h e r e
i s a n a d d i t i o n a l 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 s s u p p o r t e d i n t h e A T U s c o n f i g u r a t i o n
s p a c e .
F i g u r e 3 7 . A T U I n t e r f a c e E x t e n d e d C o n f i g u r a t i o n H e a d e r F o r m a t ( V P D C a p a b i l i t y )
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
MSI Message Control
Reserved
PCI Express Capabilities Register
PCI Express Device Status
PCI Express Link Status
PCI Express Slot Status
Reserved
S e c t i o n 3 . 1 7 . 5 5
) w h i c h i n d i c a t e s t h e c o n f i g u r a t i o n o f f s e t o f a n a d d i t i o n a l E x t e n d e d
VPD Address
MSI Next Item Pointer
MSI Message Address
MSI Message Upper Address
MSI Message Data
. T h i s i d e n t i f i e s t h i s E x t e n d e d
Next Item Pointer
PCI Express Device Capabilities
PCI Express Device Control
PCI Express Link Capabilities
PCI Express Link Control
PCI Express Slot Capabilities
PCI Express Slot Control
PCI Express Root Control
PCI Express Root Status
) . T h i s i d e n t i f i e s t h i s E x t e n d e d C o n f i g u r a t i o n H e a d e r
Next Item Pointer
VPD Data
®
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
MSI Capability ID
A0H
A4H
A8H
ACH
S e c t i o n 4 . 7 . 2 0 , " M S I
PCI Express Cap ID
D0H
D4H
D8H
DCH
E0H
E4H
E8H
ECH
VPD Capability ID
90H
94H
D e v e l o p e r ' s M a n u a l
2 9 1
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