Intel 81342 Developer's Manual page 605

D D R S D R A M M e m o r y C o n t r o l l e r — I n t e l
T h e D M C U s u p p o r t s o p t i m i z e d p e r f o r m a n c e f o r r a n d o m a d d r e s s t r a n s a c t i o n s . T h i s
o p t i m i z a t i o n e l i m i n a t e s t h e n e e d o f t h e D D R S D R A M C o n t r o l B l o c k t o i s s u e t h e
t r a n s a c t i o n c o m m a n d t o t h e D D R a r r a y w h e n t h e p r e v i o u s t r a n s a c t i o n i s t h e s a m e t y p e
( r e a d o r w r i t e ) . I n a d d i t i o n , t h e D D R S D R A M C o n t r o l B l o c k s u p p o r t s p i p e l i n i n g o f
t r a n s a c t i o n s w h i c h a l l o w s t h e c o l u m n a d d r e s s o f t h e n e x t t r a n s a c t i o n t o b e i s s u e d
b e f o r e t h e c u r r e n t t r a n s a c t i o n ' s d a t a t r a n s f e r i s c o m p l e t e d b y t h e D D R S D R A M d e v i c e s .
T h e s e o p t i m i z a t i o n s a r e i l l u s t r a t e d i n
.
F i g u r e 9 0 . D D R S D R A M P i p e l i n e d W r i t e s
Notes:
- DI b, etc. = Data In for column b, etc.
- DI b', etc. = the next Data in following DI b, etc. according to the programmed burst order
- Burst Length = 4 is shown.
- Write command may be to any bank and may be in the same or different devices.
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
T0 T1
CK#
CK
Command Write
Bank
Address
Col b
ADDRESS Max
DQS
DI vs Do
DM
= Don't Care
F i g u r e 9 0 f o r r a n d o m w r i t e m e m o r y t r a n s a c t i o n s
T2 T3 T4 T5
Write Write
Bank Bank
Col x Col n
Do Do Do Do
b b' x x'
T6 T7 T8 T9
Write Write
Bank Bank
Col a Col g
Do Do Do Do
n n' a a'
®
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
B0408-01
6 0 5