參數(shù)資料
型號: UPD720122
廠商: NEC Corp.
英文描述: MOS Integrated Circuit
中文描述: 馬鞍山集成電路
文件頁數(shù): 58/82頁
文件大小: 650K
代理商: UPD720122
Data Sheet S16685EJ2V0DS
58
μ
PD720122
(b) External local bus 8-bit mode DMA single mode write transfer
Symbol
Parameter
Min.
Typ.
Max.
Unit
L8T35
DMA request acknowledge setup time (EP2_WRB
)
0
ns
L8T36
DMA request off time 1 (EP2_DACKB
)
54
Note
ns
L8T37
DMA single mode write transfer cycle time
88
ns
L8T38
Write command width
54
ns
L8T39
Write command inactive time
34
ns
L8T40
Write data setup time (EP2_WRB
)
10
ns
L8T41
Write data hold time (EP2_WRB
)
0
ns
L8T44
DMA request acknowledge hold time (EP2_WRB
)
0
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.
Note
The difference in specifications when compared with L8T22 is that BIU processing is performed for EP1 and
that EPC2 processing is performed for EP2.
(Overall)
EP2_DRQB
EP2_TCB
LD7 to LD0
EP2_WRB
EP2_DACKB
N cycle
N
1 cycle
1 cycle
L8t
36
L8t
38
L8t
44
L8t
39
L8t
40
L8t
41
High Level
L8t
35
L8t
37
L8t
44
L8t
40
L8t
41
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