– 19 –
(Fig. 14.4-6) DMA multi word transfer timing
Symbol
Item
Min
Max
Unit
t38
From –DMACK assert to –DIOW low
0
ns
t39
–DIOW, –DIOR pulse width
70
ns
t40
–DIOW, –DIOR interactive pulse width
25
ns
t41
Write data setup time
20
ns
t42
Write data hold time
10
ns
t43
Read data delay time
50
ns
t44
Read data hold time
5
ns
t45
From –DIOW, –DIOR low to DMARQ negate
35
ns
t46
From –DIOW, –DIOR high to –DMACK negate
5
ns
t48
Write cycle time
120
ns
t49
Read cycle time
120
ns
H
L
H
L
H
L
H
L
H
L
DMARQ
–DMACK
–DIOW
DD0 ~ DD15
–DIOR
H
L
DD0 ~ DD15
t45
t38
t39
t40
t48
t46
t41 t42
t43
t49
t44
