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): 39/82頁(yè)
文件大小: 650K
代理商: UPD720122GC-9EU
Data Sheet S16685EJ2V0DS
39
μ
PD720122
2.6.3
AC characteristics of BIU block with function 2 or 3 selected
(1) CPU bus read operation
Symbol
Parameter
Min.
Typ.
Max.
Unit
TB1
Read cycle time
86
ns
TB2
Address setup time (ALE
)
10
ns
TB3
Chip select setup time (ALE
)
17
ns
TB4
Read command delay time (ALE
)
7
ns
TB5
Output data delay time (RDB
)
57
ns
TB6
Read command width
57
ns
TB7
Output data hold time (RDB
)
4
ns
TB8
Chip select hold time (RDB
)
5
ns
TB9
ALE width
10
ns
TB10
Address hold time (ALE
)
0
ns
TB11
Chip select setup time (RDB
)
5
ns
TB12
Buffer direction change time (RDB
)
14
ns
Remark
It is assumed that the external pin capacitance is 15 pF (data bus = 50 pF).
CPU bus read timing
RDB
AD7 to AD0
D15 to D8
Note
CSB
ADDRES
VALID
tb
7
tb
6
tb
5
ALE
DATA
VALID
tb
2
tb
4
tb
8
ADDRES
VALID
tb
1
tb
9
tb
11
tb
12
tb
10
DATA
invalid
tb
3
Note
D7 to D0 for Function 2
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