MCIMX27 Motorola Semiconductor Products, MCIMX27 Datasheet - Page 75

• Manufacturer Part Number: MCIMX27
• Manufacturer: Motorola Semiconductor Products

Freescale Semiconductor
1
SD10 and SD11 are determined by SDRAM controller register settings.
SD10
SD11
SD3
SD6
SD7
ID
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.
Table 38. SDRAM Refresh Timing Parameters (continued)
Parameter
Table 38
i.MX27 Data Sheet, Advance Information, Rev. 0.1
Preliminary—Subject to Change Without Notice
1
indicates SDRAM requirements. All output signals
1
NOTE
Symbol
tCK
tAH
tRP
tRC
tAS
Min
7.5
1.8
1.8
1
2
Max
20
—
—
—
4
Signal Descriptions
clock
clock
Unit
ns
ns
ns
75