參數(shù)資料
型號: UPD720122F1-DN2
廠商: NEC Corp.
英文描述: MOS Integrated Circuit
中文描述: 馬鞍山集成電路
文件頁數(shù): 56/82頁
文件大?。?/td> 650K
代理商: UPD720122F1-DN2
Data Sheet S16685EJ2V0DS
56
μ
PD720122
(2) External local bus 8-bit mode
(a) External local bus 8-bit mode DMA single mode read transfer timing
Symbol
Parameter
Min.
Typ.
Max.
Unit
L8T21
DMA request acknowledge setup time (EP1_RDB
)
0
ns
L8T22
DMA request off time 1 (EP1_DACKB
)
10
ns
L8T23
DMA single mode read transfer cycle time
91
ns
L8T24
Read command width
57
ns
L8T25
Read command inactive time
34
ns
L8T26
Read data delay time (EP1_RDB
)
57
ns
L8T27
Buffer direction change time (EP1_RDB
)
14
ns
L8T28
Read data hold time (EP1_RDB
)
4
ns
L8T31
EP1_STOPB delay time (EP1_RDB
)
15
ns
L8T32
EP1_STOPB delay time (EP1_RDB
)
3
ns
L8T33
DMA request acknowledge hold time (EP1_RDB
)
0
ns
L8T34
Undefined
ns
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).
2.
3.
(Overall)
EP1_DRQB
EP1_TCB
LD7 to LD0
EP1_RDB
EP1_DACKB
N cycle
N
1 cycle
1 cycle
L8t
22
L8t
23
L8t
24
L8t
25
L8t
26
L8t
28
High level
EP1_STOPB
High level
EP1_STOPB is not asserted in
the case of a full packet.
L8t
21
L8t
27
L8t
31
L8t
32
L8t
33
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