參數(shù)資料
型號: MCIMX258CVM4
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, PBGA400
封裝: 17 X 17 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-400
文件頁數(shù): 112/154頁
文件大?。?/td> 1498K
代理商: MCIMX258CVM4
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 8
60
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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