參數(shù)資料
型號: MCIMX258CVM4
廠商: Freescale Semiconductor
文件頁數(shù): 108/153頁
文件大?。?/td> 0K
描述: IC MPU I.MX25 IND 400MAPBGA
標(biāo)準(zhǔn)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
58
Freescale Semiconductor
Figure 27. SDRAM Refresh Timing Diagram
Table 45. SDR SDRAM Write 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
SD4
CS, RAS, CAS, WE, DQM, CKE setup time
tCMS
2.0
ns
SD5
CS, RAS, CAS, WE, DQM, CKE hold time
tCMH
1.8
ns
SD6
Address setup time
tAS
2.0
ns
SD7
Address hold time
tAH
1.8
ns
SD11
Precharge cycle period1
1 SD11 and SD12 are determined by SDRAM controller register settings.
tRP
1
4
clock
SD12
Active to read/write command delay1
tRCD
1
8
clock
SD13
Data setup time
tDS
2.0
ns
SD14
Data hold time
tDH
1.3
ns
CS
CAS
WE
RAS
ADDR
BA
ROW/BA
SD6
SD7
SD11
SD10
SDCLK
SD1
SD2
SDCLK
SD3
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