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IMX35 bảng dữ liệu(PDF) 49 Page - Freescale Semiconductor, Inc

tên linh kiện IMX35
Giải thích chi tiết về linh kiện  i.MX35 Applications Processors for Industrial and Consumer Products
PDF  148 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

IMX35 bảng dữ liệu(HTML) 49 Page - Freescale Semiconductor, Inc

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i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6
Freescale Semiconductor
49
NOTE
SDR SDRAM CLK parameters are measured from the 50% point—that is,
“high” is defined as 50% of signal value and “low” is defined as 50% of
signal value.
The timing parameters are similar to the ones used in SDRAM data sheets.
Table 34 indicates SDRAM requirements. All output signals are driven by
the ESDCTL at the negative edge of SDCLK, and the parameters are
measured at maximum memory frequency.
Figure 30. SDRAM Self-Refresh Cycle Timing Diagram
SD7
Address hold time
tAH
1.8
—
ns
SD10
Precharge cycle period1
tRP
1
4
clock
SD11
Auto precharge command period1
tRC
2
20
clock
1 SD10 and SD11 are determined by SDRAM controller register settings.
Table 34. 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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