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): 30/82頁(yè)
文件大?。?/td> 650K
代理商: UPD720122GC-9EU
Data Sheet S16685EJ2V0DS
30
μ
PD720122
(c) CPU bus DMA demand read transfer timing
Symbol
Parameter
Min.
Typ.
Max.
Unit
T45
DMA request acknowledge setup time (RDB
)
0
ns
T46
DMA demand mode read transfer cycle time
91
ns
T47
Read command width
57
ns
T48
Read command inactive time
34
ns
T49
Read data delay time (RDB
)
57
ns
T50
Buffer direction change time (RDB
)
14
ns
T51
Read data hold time (RDB
)
4
ns
T52
EP1_TCB setup time (RDB
)
0
Note
ns
T53
EP1_TCB hold time (RDB
)
17
ns
T54
EP1_STOPB delay time (RDB
)
15
ns
T55
EP1_STOPB delay time (RDB
)
3
ns
T56
DMA request off time (RDB
)
59
ns
T57
DMA request acknowledge hold time (RDB
)
0
ns
T69
DMA request off time (EP1_DACKB
)
38
ns
T71
DMA request off time (EP1_DACKB
) 1 cycle transfer
38
ns
T72
DMA request on time (EP1_DACKB
)
88
ns
T74
DMA request off time (RDB
)
60
ns
Note
Can be input after immediately previous RDB
.
Remark
It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF).
(Overall)
EP1_DRQB
EP1_TCB
D15 to D0
RDB
EP1_DACKB
N cycle
N
1 cycle
1 cycle
t
46
t
47
t
48
t
49
t
51
t
56
High level
t
45
t
50
t
57
EP1_STOPB
High level
t
54
t
55
EP1_STOPB is not asserted in the
case of a full packet.
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