參數(shù)資料
型號: MCIMX31
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Multimedia Applications Processors
中文描述: 多媒體應(yīng)用處理器
文件頁數(shù): 98/170頁
文件大?。?/td> 1562K
代理商: MCIMX31
i.MX31/i.MX31L Advance Information, Rev. 1.4
98
Freescale Semiconductor
Preliminary
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.
Figure 39. SDRAM Self-Refresh Cycle Timing Diagram
NOTE
The clock will continue to run unless both CKEs are low. Then the clock will
be stopped in low state.
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 period
1
tRP
1
4
clock
SD11
Auto precharge command period
1
tRC
2
20
clock
1
SD10 and SD11 are determined by SDRAM controller register settings.
Table 36. SDRAM Refresh Timing Parameters (continued)
ID
Parameter
Symbol
Min
Max
Unit
SDCLK
CS
CAS
RAS
ADDR
BA
WE
CKE
Don’t care
SD16
SD16
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