參數(shù)資料
型號(hào): UPD720122GC-9EU
廠商: NEC Corp.
英文描述: MOS Integrated Circuit
中文描述: 馬鞍山集成電路
文件頁(yè)數(shù): 34/82頁(yè)
文件大?。?/td> 650K
代理商: UPD720122GC-9EU
Data Sheet S16685EJ2V0DS
34
μ
PD720122
(d) CPU bus DMA demand write transfer timing
Symbol
Parameter
Min.
Typ.
Max.
Unit
T58
DMA request acknowledge setup time (WRB
)
0
ns
T59
DMA demand mode write transfer cycle time
72
ns
T60
Write command width
38
ns
T61
Write command inactive time
34
ns
T62
Write data setup time (WRB
)
10
ns
T63
Write data hold time (WRB
)
0
ns
T64
EP2_TCB setup time (WRB
)
0
Note
ns
T65
EP2_TCB hold time (WRB
)
17
ns
T66
DMA request off time (WRB
)
60
ns
T67
DMA request acknowledge hold time (WRB
)
0
ns
T70
DMA request off time (EP2_DACKB
)
38
ns
T73
DMA request on time (EP2_DACKB
)
88
ns
T75
DMA request off time (WRB
)
60
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
N cycle
N
1 cycle
1 cycle
t
59
t
60
t
61
t
62
t
63
t
66
High level
t
58
t
67
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