MCIMX31 Motorola Semiconductor Products, MCIMX31 Datasheet - Page 49

• Manufacturer Part Number: MCIMX31
• Manufacturer: Motorola Semiconductor Products

Freescale Semiconductor
1
SD10 and SD11 are determined by SDRAM controller register settings.
SD10
SD11
SD1
SD2
SD3
SD6
SD7
ID
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
SDR SDRAM CLK parameters are being measured from the 50%
point—that is, high is defined as 50% of signal value and low is defined as
50% of signal value.
The timing parameters are similar to the ones used in SDRAM data
sheets—that is,
are driven by the ESDCTL at the negative edge of SDCLK and the
parameters are measured at maximum memory frequency.
Parameter
MCIMX31/MCIMX31L Advance Information, Rev. 3.2
Table 36. SDRAM Refresh Timing Parameters
Table 36
1
Preliminary—Subject to Change Without Notice
indicates SDRAM requirements. All output signals
1
NOTE
NOTE
Symbol
tCH
tCK
tAH
tRP
tRC
tCL
tAS
Min
3.4
3.4
7.5
1.8
1.8
1
2
Electrical Characteristics
Max
4.1
4.1
20
—
—
—
4
clock
clock
Unit
ns
ns
ns
ns
ns
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