参数资料
型号: MCIMX27VOP4
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA404
封装: 17 X 17 MM, 0.65 MM PITCH, LEAD FEE, MAPBGA-404
文件页数: 92/118页
文件大小: 1159K
代理商: MCIMX27VOP4
Signal Descriptions
i.MX27 Data Sheet, Advance Information, Rev. 0.1
Freescale Semiconductor
Preliminary—Subject to Change Without Notice
75
NOTE
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, Table 38 indicates SDRAM requirements. All output signals
are driven by the ESDCTL at the negative edge of SDCLK and the
parameters are measured at maximum memory frequency.
SD3
SDRAM clock cycle time
tCK
7.5
ns
SD6
Address setup time
tAS
1.8
ns
SD7
Address hold time
tAH
1.8
ns
SD10
Precharge cycle period1
tRP
1
4
clock
SD11
Auto precharge command period1
tRC
2
20
clock
1 SD10 and SD11 are determined by SDRAM controller register settings.
Table 38. SDRAM Refresh Timing Parameters (continued)
ID
Parameter
Symbol
Min
Max
Unit
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