Intel 81342 Developer's Manual page 488

5 . 6 . 2 6 4 / 3 2 - b i t U n a l i g n e d D a t a T r a n s f e r s
F i g u r e 5 6
a n u n a l i g n e d 6 4 - b i t d e s t i n a t i o n a d d r e s s .
F i g u r e 5 6 . O p t i m i z a t i o n o f a n U n a l i g n e d A D M A T r a n s f e r
64-bit Destination Bus
Programmed Values
CCR
PADR
PUADR
LADR
BCR
DCR
®
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
4 8 8
i l l u s t r a t e s a n A D M A t r a n s f e r b e t w e e n a n u n a l i g n e d 3 2 - b i t s o u r c e a d d r e s s a n d
MSB
32-Bit Source Bus
5
13
17
(Internal Bus)
1
0000 0001H
A000 0201H
0000 0000H
4001 0303H
word load @ A0000200
word load @ A0000204
0000 0010H
word load @ A0000208
word load @ A000020C
0000 0006H
word load @ A0000210
®
I n t e l 8 1 3 4 1 a n d 8 1 3 4 2 — A p p l i c a t i o n D M A U n i t
LSB
MSB
3
(PCI Bus)
7
11
15
4 3 2 1
12 11 10 9
16 15 14 13
1 1 1 1
Bus Operation
SOURCE
5-byte store @ 40010303
8-byte store @ 40010308
3-byte store @ 40010310
Address
2 1 1
A000 0200H
6 5 4
A000 0204H
10 9 8
A000 0208H
14 13 12
A000 020CH
16
A000 020CH
2 1 1
4001 0300H
8 7 6
4001 0308H
16 15 14
4001 0310H
20 19 18
10
Byte number
DESTINATION
A7674-01
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