參數(shù)資料
型號: MCIMX258CVM4
廠商: Freescale Semiconductor
文件頁數(shù): 109/153頁
文件大?。?/td> 0K
描述: IC MPU I.MX25 IND 400MAPBGA
標準包裝: 90
系列: i.MX25
核心處理器: ARM9
芯體尺寸: 32-位
速度: 400MHz
連通性: 1 線,CAN,EBI/EMI,以太網(wǎng),I²C,MMC,智能卡,SPI,SSI,UART/USART,USB OTG
外圍設(shè)備: DMA,I²S,LCD,POR,PWM,WDT
輸入/輸出數(shù): 128
程序存儲器類型: 外部程序存儲器
RAM 容量: 144K x 8
電壓 - 電源 (Vcc/Vdd): 1.15 V ~ 1.52 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 3x12b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 400-LFBGA
包裝: 托盤
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 10
Freescale Semiconductor
59
Figure 28. SDRAM Self-Refresh Cycle Timing Diagram
NOTE
The clock continues to run unless CKE is low. Then the clock is stopped in
low state.
Table 46. SDRAM Refresh Timing Parameters
ID
Parameter
Symbol
Min.
Max.
Unit
SD1
SDRAM clock high-level width
tCH
3.4
4.1
ns
SD2
SDRAM clock low-level width
tCL
3.4
4.1
ns
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
1 SD10 and SD11 are determined by SDRAM controller register settings.
tRP
1
4
clock
SD11
Auto precharge command period1
tRC
2
20
clock
SDCLK
CS
CAS
RAS
ADDR
BA
WE
CKE
Don’t care
SD16
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