MCIMX255AJM4A Freescale, MCIMX255AJM4A Datasheet - Page 59
MCIMX255AJM4A
Manufacturer Part Number
MCIMX255AJM4A
Description
Manufacturer
Freescale
Datasheet
1.MCIMX255AJM4A.pdf
(132 pages)
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Freescale Semiconductor
SD10 and SD11 are determined by SDRAM controller register settings.
SD10
SD11
SD1
SD2
SD3
SD6
SD7
ID
SDCLK
CAS
CKE
ADDR
RAS
WE
CS
SDRAM clock high-level width
SDRAM clock low-level width
SDRAM clock cycle time
Address setup time
Address hold time
Precharge cycle period
Auto precharge command period
The clock continues to run unless CKE is low. Then the clock is stopped in
low state.
Don’t care
BA
i.MX25 Applications Processor for Automotive Products, Rev. 4
Figure 28. SDRAM Self-Refresh Cycle Timing Diagram
Parameter
Table 44. SDRAM Refresh Timing Parameters
1
SD16
1
NOTE
Symbol
tCH
tRC
tCK
tAS
tAH
tRP
tCL
SD16
Min.
3.4
3.4
7.5
1.8
1.8
1
2
Max.
4.1
4.1
20
—
—
—
4
clock
clock
Unit
ns
ns
ns
ns
ns
59
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