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): 42/98頁
文件大?。?/td> 1326K
代理商: MC94MX21DVKN3R2
Specifications
MC94MX21 Technical Data, Rev. 1.
Freescale Semiconductor
47
Figure 39. SDRAM Write Cycle Timing Diagram
4S
Address setup time
3.67
2
ns
4H
Address hold time
2.95
2
ns
5
SDRAM access time (CL = 3)
5.4
5.4
ns
5
SDRAM access time (CL = 2)
6.0
6.0
ns
5
SDRAM access time (CL = 1)
ns
6
Data out hold time
2
2
–ns
7
Data out high-impedance time (CL = 3)
tHZ
1
–tHZ
1
ns
7
Data out high-impedance time (CL = 2)
tHZ
1
–tHZ
1
ns
7
Data out high-impedance time (CL = 1)
ns
8
Active to read/write command period (RC = 1)
tRCD
2
–tRCD
2
–ns
1. tHZ = SDRAM data out high-impedance time, external SDRAM memory device dependent parameter.
2. tRCD = SDRAM clock cycle time. The tRCD setting can be found in the i.MX21 reference manual.
Table 30. SDRAM Read Cycle Timing Parameter (Continued)
Ref
No.
Parameter
1.8 V
± 0.1 V
3.0 V
± 0.3 V
Unit
Minimum
Maximum
Minimum
Maximum
SDCLK
CS
CAS
WE
RAS
ADDR
DQ
DQM
/ BA
ROW/BA
3
4
6
1
COL/BA
DATA
2
5
7
8
9
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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