Table of Contents
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PORT
06
PORT 07
PORT
08
B I T
0
1
2
3
4
5
6
7
B I T
0
1
2
3
4
5
6
7
DMA
Con t r 01 l e r
IOW*
= 0:
C h a n n e l 3
Base
and C u r r e n t A d d r e s s
I n t e r n a l F l i p / F l o p
=
0: Write AO-A7
I n t e r n a l F l i p / F l o p
=
1: Write A8-Al5
I n t e r n a l F l i p / F l o p
= 0:
Read AO-A7
I n t e r n a l F l i p / F l o p
=
1:
Read A8-Al5
IOR*
=
0:
Channel
3
C u r r e n t A d d r e s s
DMA
C o n t r o l l e r
IOW*
=
0:
Channel
3 Base
and C u r r e n t Word C o u n t
I n t e r n a l F l i p / F l o p
= 0:
Write W O - W 7
I n t e r n a l F l i p / F l o p
=
1: Write W8-Wl5
I n t e r n a l F l i p / F l o p
= 0:
Read W O - W 7
I n t e r n a l F l i p / F l o p
=
1:
Read W8-Wl5
I O R * = 0:
C h a n n e l 3 C u r r e n t Word Count
DMA
C o n t r o l l e r
IOW*
= 0 ,
Write Command R e g i s t e r
D e s c r i p t i o n
0
=
Memory t o Memory D i s a b l e
1
=
Memory t o Memory E n a b l e
0
=
C h a n n e l 0 A d d r e s s Hold D i s a b l e
1 =
C h a n n e l 0 A d d r e s s Hold E n a b l e
X
I f b i t 0
=
0
0 =
C o n t r o l l e r e n a b l e
1 =
C o n t r o l l e r d i s a b l e
0 =
Normal t i m i n g
1 =
Compressed t i m i n g
x
I f b i t 0
=
1
0
=
F i x e d p r i o r i t y
1
=
R o t a t i n g p r i o r i t y
0 = L a t e
w r i t e s e l e c t i o n
1 =
E x t e n d e d w r i t e s e l e c t i o n
x
I f
b i t
3 = 1
0 =
DREQ
s e n s e a c t i v e h i g h
1 =
DREQ
s e n s e a c t i v e low
0 =
DACK
s e n s e a c t i v e low
1 =
DACK
s e n s e a c t i v e h i g h
I O R * =
0 , Read S t a t u s R e g i s t e r
Desc
r
i p t i o n
1 =
C h a n n e l
0
h a s r e a c h e d TC
1 = C h a n n e l 1 h a s r e a c h e d
TC
1 = Channel 2 h a s r e a c h e d TC
1 =
C h a n n e l 3 h a s r e a c h e d
TC
1 =
C h a n n e l 0 R e q u e s t
1 = C h a n n e l 1 R e q u e s t
1 =
Channel
2
R e q u e s t
1 =
C h a n n e l
3
R e q u e s t
13
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