Teac DW-224E-V - Page 21

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(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