Hi,
Does some one know the SDHC spec. of i.MX31?
There are input setup/hold time of SDHC in data sheet. However, it specify max value of setup/hold time like below.
SDHC input setup MAX 18.5nS, SDHC input hold MAX -11.5nS.
Usually, setup/hold time should be minimum value not MAX.
Could you teach min value of setup/hold time?
Best Regards,
Sugiyama
Hello,
Parameters SD7 and SD8 are defined in the i.MX31 specs with regard to the failing CLK.
SD specs assume rising ones; so min values of SD7 and SD8 are calculated as
CLK period / 2 - SD7/8.
Have a great day,
Yuri
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Hi, Yuri,
Thank you for quick reply.
If it is CLK period/2 - SD7/8, it depend on frequency, but I think setup/hold timing are fixed value.
Does it aware only 25MHz clock and use that value for other frequency?
I calculated them at 25MHz, 40nS cycle
Does it mean setup is 1.5nS min and hold is 8.5nS min?
Does this use for all frequency?
Best Regards,
Sugiyama