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): 99/170頁
文件大?。?/td> 1562K
代理商: MCIMX31
Electrical Characteristics
i.MX31/i.MX31L Advance Information, Rev. 1.4
Freescale Semiconductor
99
Preliminary
Figure 40. Mobile DDR SDRAM Write Cycle Timing Diagram
NOTE
SDRAM CLK and DQS related 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.
Table 37. SDRAM Self-Refresh Cycle Timing Parameters
ID
Parameter
Symbol
Min
Max
Unit
SD16
CKE output delay time
tCKS
1.8
ns
Table 38. Mobile DDR SDRAM Write Cycle Timing Parameters
ID
Parameter
Symbol
Min
Max
Unit
SD17
DQ & DQM setup time to DQS
tDS
1.2
ns
SD18
DQ & DQM hold time to DQS
tDH
1.2
ns
SD19
Write cycle DQS falling edge to SDCLK output
delay time.
tDSS
1.8
ns
SD20
Write cycle DQS falling edge to SDCLK output hold
time.
tDSH
1.8
ns
SDCLK
SDCLK
DQS (output)
DQ (output)
DQM (output)
Data
Data
Data
Data
Data
Data
Data
Data
DM
DM
DM
DM
DM
DM
DM
DM
SD17
SD17
SD17
SD17
SD18
SD18
SD18
SD18
SD19
SD20
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