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參數(shù)資料
| 型號： | CXD4000R |
| 英文描述： | Fingerprint Verification System LSI |
| 中文描述： | 指紋識別系統(tǒng)LSI |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 216K |
| 代理商： | CXD4000R |
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11
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CXD4000R
(8) External Memory Interface
Read Timing
(Within the recommended operating range)
1
BWTn: Number of waits setting
2
Prescribed from the timing at which any of A0 to A20, CSn or RD first becomes invalid.
Item
Chip select pulse width
1
Read strobe pulse width
1
Address CSn
↓ →
RD
↓
Read data setup time
Read data hold time
2
Symbol
t
RCS
t
RD
t
CSRD
t
DS
t
DH
Min.
(2 + BWTn)
×
t
sys
–
20
(1 + BWTn)
×
t
sys
–
20
t
sys
–
20
50
0
Unit
ns
ns
ns
ns
ns
Max.
(2 + BWTn)
×
t
sys + 20
(1 + BWTn)
×
t
sys + 20
t
sys + 20
—
—
Fig. 8-1. External Memory Interface Timing (Read)
t1
t
DS
t2
t
RD
t
RCS
t
CSRD
t
DH
D0 to D15
A0 to A20
CSn
RD
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