UPD720122 datasheet(52/82 Pages) NEC

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Data Sheet S16685EJ2V0DS

µPD720122

(d) External local bus 16-bit mode DMA demand write transfer timing

Symbol

Parameter

Min.

Typ.

Max.

Unit

L16T58

DMA request acknowledge setup time (EP2_WRB

↓)

∞

L16T59

DMA demand mode write transfer cycle time

∞

L16T60

Write command width

∞

L16T61

Write command inactive time

∞

L16T62

Write data setup time (EP2_WRB

↑)

∞

L16T63

Write data hold time (EP2_WRB

↑)

∞

L16T64

EP2_TCB setup time (EP2_WRB

↓)

Note

L16T65

EP2_TCB hold time (EP2_WRB

↓)

∞

L16T66

DMA request off time (EP2_WRB

↑)

−

L16T67

DMA request acknowledge hold time (EP2_WRB

↑)

∞

L16T70

DMA request off time (EP2_DACKB

↓)

−

L16T73

DMA request on time (EP2_DACKB

↑)

−

L16T75

DMA request off time (EP2_WRB

↓)

−

Note

Can be input after previous EP2_WRB

↑.

Remark

It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF).

(Overall)

EP2_DRQB

EP2_TCB

LD15 to LD0

EP2_WRB

EP2_DACKB

N cycle

−−−− 1 cycle

1 cycle

L16t59

L16t60

L16t61

L16t62

L16t63

L16t66

High level

L16t58

L16t67

UPD720122 Datasheet(PDF) 52 Page - NEC

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