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UPD720122 Datasheet(PDF) 27 Page - NEC

No. de pieza UPD720122
Descripción Electrónicos  MOS Integrated Circuit
PDF  82 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD720122 Datasheet(HTML) 27 Page - NEC

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Data Sheet S16685EJ2V0DS
27
µPD720122
(b) CPU bus DMA single mode write transfer
Symbol
Parameter
Min.
Typ.
Max.
Unit
T35
DMA request acknowledge setup time (WRB
↓)
0
∞
ns
T36
DMA request off time (EP2_DACKB
↓)
−
54
ns
T37
DMA single mode write transfer cycle time
88
∞
ns
T38
Write command width
54
∞
ns
T39
Write command inactive time
34
∞
ns
T40
Write data setup time (WRB
↑)
10
∞
ns
T41
Write data hold time (WRB
↑)
0
∞
ns
T42
EP2_TCB setup time (WRB
↓)
0
Note
ns
T43
EP2_TCB hold time (WRB
↓)
17
∞
ns
T44
DMA request acknowledge hold time (WRB
↑)
0
∞
ns
Note
Can be input after immediately previous WRB
↑.
Remark
It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF).
(Overall)
EP2_DRQB
EP2_TCB
D15 to D0
WRB
EP2_DACKB
t36
t38
t37
t39
t40
t41
High level
N cycle
N
−−−− 1 cycle
1 cycle
t35
t44
t40
t41
t44



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