Intel 81342 Developer's Manual page 987

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C l o c k i n g a n d R e s e t — I n t e l
1 9 . 1 . 1 . 2 . 1 C e n t r a l R e s o u r c e M o d e ( P C I X _ E P # = ' 1 ' )
W h e n o p e r a t i n g a s t h e C e n t r a l R e s o u r c e (
f r e q u e n c y a n d d e f a u l t v a l u e i n A T U X P C S R [ 1 9 : 1 6 ] i s d e t e r m i n e d b a s e d o n t h e s a m p l i n g
P C I X C A P
o f
T a b l e 6 2 5 . P C I B u s F r e q u e n c y I n i t i a l i z a t i o n
P _ P C I X C A P P _ M O D E 2 P _ M 6 6 E N P C I X M 1 _ 1 0 0
b
< 0 . 1 1 V C C –
< 0 . 1 1 V C C –
< 0 . 6 V C C &
G N D
> 0 . 1 1 V C C
< 0 . 6 V C C &
V C C
> 0 . 1 1 V C C
< 0 . 6 V C C &
V C C
> 0 . 1 1 V C C
< 0 . 8 9 V C C &
–
> 0 . 6 V C C
> 0 . 8 9 V C C –
> 0 . 8 9 V C C –
a . 8 1 3 4 1 a n d 8 1 3 4 2 d o e s n o t s u p p o r t P C I - X 5 3 3 M h z .
b . A ' – ' i n t a b l e i n d i c a t e s v a l u e i s a ' d o n ' t c a r e ' f o r c o m p u t i n g b u s m o d e / f r e q u e n c y . A l l s i g n a l s m u s t s t i l l b e p u l l e d t o a v a l i d l o g i c
l e v e l .
W h e n P C I E x p r e s s * R E F C L K i s t h e p r i m a r y c l o c k s o u r c e , t h e
b e u s e d t o c o n t r o l t h e o p e r a t i n g f r e q u e n c y o f a n e x t e r n a l c l o c k s o u r c e f o r t h e P C I b u s .
C R _ F R E Q [ 1 : 0 ]
T h e
r e g i s t e r ( o f f s e t x 0 7 4 ) .
T a b l e 6 2 6 . C R _ F R E Q [ 1 : 0 ] E n c o d i n g
A T U X P C S R [ 1 9 : 1 6 ] ( P C I X I n i t
P a t t e r n )
1 1 1 1
1 1 1 1
1 1 1 0
1 1 0 1
1 1 0 0
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
8 1 3 4 1 a n d 8 1 3 4 2
P _ M O D E 2 M 6 6 E N
, ,
#
G r o u n d –
N o t
–
c o n n e c t e d
– –
– –
– –
– –
– G N D
– V C C
v a l u e c a n b e c h a n g e d b y s e t t i n g b i t s [ 1 9 : 1 6 ] i n t h e A T U X P C S R
A T U X P C S R [ 1 0 ]
( P _ M 6 6 E N )
0
1
–
–
–
P C I X _ E P #
= 1 ) , t h e b u s P C I b u s o p e r a t i n g
P C I X M 1 _ 1 0 0 # , and
,
a
P C I X M 2 _ 1 0 0
P C I B u s M o d e P C I B u s F r e q u e n c y
#
– P C I
– P C I
P C I - X
–
M o d e 1
P C I - X
G N D
M o d e 2
P C I - X
V C C
M o d e 2
P C I - X
–
M o d e 1
P C I - X
–
M o d e 1
P C I - X
–
M o d e 1
C R _ F R E Q [ 1 : 0
]
1 1
1 0
1 0
0 1
0 0
P C I X M 2 _ 1 0 0 # .
A T U X
P C S R [ 1 9 : 1 6
3 3 M H z
6 6 M H z
6 6 M H z
1 0 0 M H z
( P C I - X 2 0 0 M H z )
1 3 3 M H z
( P C I - X 2 6 6 M H z )
6 6 M H z
1 0 0 M H z
1 3 3 M H z
C R _ F R E Q [ 1 : 0 ] p i n s c a n
B u s F r e q u e n c y B u s M o d e
3 3 M H z C o n v e n t i o n a l P C I
6 6 M H z C o n v e n t i o n a l P C I
6 6 M H z P C I - X
1 0 0 M H z P C I - X
1 3 3 M H z P C I - X
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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
]
1 1 1 1
1 1 1 1
1 1 1 0
0 1 0 1
0 1 0 0
1 1 1 0
1 1 0 1
1 1 0 0
9 8 7