UPD720122 datasheet(60/82 Pages) NEC

60 / 82 page

Data Sheet S16685EJ2V0DS

µPD720122

Symbol

Parameter

Min.

Typ.

Max.

Unit

L8T45

DMA request acknowledge setup time (EP1_RDB

↓)

∞

L8T46

DMA demand mode read transfer cycle time

∞

L8T47

Read command width

∞

L8T48

Read command inactive time

∞

L8T49

Read data delay time (EP1_RDB

↓)

−

L8T50

Buffer direction change time (EP1_RDB

↓)

−

L8T51

Read data hold time (EP1_RDB

↑)

−

L8T54

EP1_STOPB delay time (EP1_RDB

↓)

−

L8T55

EP1_STOPB delay time (EP1_RDB

↑)

−

L8T56

DMA request off time (EP1_RDB

↑)

−

L8T57

DMA request acknowledge hold time (EP1_RDB

↑)

∞

Remarks 1.

Use of EP1_TCB is prohibited in the 8-bit external local bus mode. Clamp this signal to the inactive

status.

LD15 to 8 are undefined in the 8-bit external local bus mode (these signals are invalid when input and

undefined when output).

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

(Overall)

EP1_DRQB

EP1_TCB

LD7 to LD0

EP1_RDB

EP1_DACKB

N cycle

−−−− 1 cycle

1 cycle

L8t46

L8t47

L8t48

L8t49

L8t51

L8t56

High level

EP1_STOPB

High level

L8t54

L8t55

L8t57

EP1_STOPB is not asserted in the

case of a full Packet.

L8t50

L8t45

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