參數(shù)資料
型號: MC94MX21DVKN3R2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 350 MHz, MICROPROCESSOR, PBGA289
封裝: 14 X 14 MM, 1.41 MM HEIGHT, 0.65 MM PITCH, LEAD FREE, PLASTIC, BGA-289
文件頁數(shù): 41/98頁
文件大?。?/td> 1326K
代理商: MC94MX21DVKN3R2
MC94MX21 Technical Data, Rev. 1.
46
Freescale Semiconductor
Specifications
3.15
SDRAM Memory Controller
The following figures (Figure 38 through Figure 41) and their associated tables specify the timings related
to the SDRAMC module in the i.MX21.
Figure 38. SDRAM Read Cycle Timing Diagram
Table 30. SDRAM Read Cycle Timing Parameter
Ref
No.
Parameter
1.8 V
± 0.1 V
3.0 V
± 0.3 V
Unit
Minimum
Maximum
Minimum
Maximum
1
SDRAM clock high-level width
3.00
3
ns
2
SDRAM clock low-level width
3.00
3
ns
3
SDRAM clock cycle time
7.5
7.5
ns
3S
CS, RAS, CAS, WE, DQM setup time
4.78
3
ns
3H
CS, RAS, CAS, WE, DQM hold time
3.03
2
ns
SDCLK
WE
ADDR
DQ
DQM
ROW/BA
COL/BA
3S
3H
3S
3H
3S
3S
3H
4S
4H
5
3S
3
2
1
8
Data
7
6
CS
CAS
RAS
Note: CKE is high during the read/write cycle.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
MC94MX21DVKN3
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