參數(shù)資料
型號(hào): UPD720122
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): 52/82頁(yè)
文件大?。?/td> 650K
代理商: UPD720122
Data Sheet S16685EJ2V0DS
52
μ
PD720122
(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
)
0
ns
L16T59
DMA demand mode write transfer cycle time
72
ns
L16T60
Write command width
38
ns
L16T61
Write command inactive time
34
ns
L16T62
Write data setup time (EP2_WRB
)
10
ns
L16T63
Write data hold time (EP2_WRB
)
0
ns
L16T64
EP2_TCB setup time (EP2_WRB
)
0
Note
ns
L16T65
EP2_TCB hold time (EP2_WRB
)
17
ns
L16T66
DMA request off time (EP2_WRB
)
60
ns
L16T67
DMA request acknowledge hold time (EP2_WRB
)
0
ns
L16T70
DMA request off time (EP2_DACKB
)
38
ns
L16T73
DMA request on time (EP2_DACKB
)
88
ns
L16T75
DMA request off time (EP2_WRB
)
60
ns
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
N
1 cycle
1 cycle
L16t
59
L16t
60
L16t
61
L16t
62
L16t
63
L16t
66
High level
L16t
58
L16t
67
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