MCIMX25 Motorola Semiconductor Products, MCIMX25 Datasheet - Page 58

• Manufacturer Part Number: MCIMX25
• Manufacturer: Motorola Semiconductor Products

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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
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 2
BA
Figure 28. SDRAM Self-Refresh Cycle Timing Diagram
Parameter
Table 42. SDRAM Refresh Timing Parameters
1
SD16
1
NOTE
Symbol
tCH
tRC
tCL
tCK
tAS
tAH
tRP
SD16
Min.
3.4
3.4
7.5
1.8
1.8
1
2
Freescale Semiconductor
Max.
4.1
4.1
20
—
—
—
4
clock
clock
Unit
ns
ns
ns
ns
ns