參數(shù)資料
型號: MCIMX27VOP4A
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA404
封裝: 17 X 17 MM, 0.65 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-404
文件頁數(shù): 128/152頁
文件大?。?/td> 3889K
代理商: MCIMX27VOP4A
i.MX27 and i.MX27L Data Sheet, Rev. 1.6
Freescale Semiconductor
77
Electrical Characteristics
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 39 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
Note:
1 SD10 and SD11 are determined by SDRAM controller register settings.
Table 39. SDRAM Refresh Timing Parameters (continued)
ID
Parameter
Symbol
Min
Max
Unit
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