參數(shù)資料
型號: LM9831CCVJDX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 消費家電
英文描述: LM9831 42-Bit Color, 1200dpi USB Image Scanner
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝: PLASTIC, TQFP-100
文件頁數(shù): 6/41頁
文件大小: 320K
代理商: LM9831CCVJDX
6
www.national.com
Timing Diagrams
Figure 1: DRAM Read and Write
Column Address
n
A0-A9
Row Address
n
Row Address
n+1
RAS
CAS
RD
Data
D0-D15
t
RD SETUP
t
RD HOLD
WR
Data
D0-D15
t
WR SETUP
t
WR HOLD
0
1
2
3
4
5
6
0
48MHz Internal Clock
(t
PERIOD
= 20.83ns)
Read Operation
Write Operation
RAS
CAS
0
1
2
3
4
5
6
0
48MHz Internal Clock
(t
PERIOD
= 20.83ns)
Figure 2: DRAM Refresh (CAS before RAS)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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