Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
03/06/07 10:53
Read: times


 
#134350 - Memory Cards - SD/MMC - Questions
I am desgning a product requiring SD/MM interfacing.

I know this topic is already being discussed in the past but still many clarification remains

Mr Scot D Dolanhas said in his following thread that he has developed interface for SD/MMC

http://www.8052.com/forum/read.phtml?id=117035

Mr Erik Malund has given link to Silab USG Mass storage refe design. Some else has also given link to SANdisk SD/MMC product manual. All these has given me lot of help in these subject
But Detailed SD/MMC card spec are given only in Sandisk Manual.
This manual is a bit confusing in regards to SPI specification
If Mr.Scot or somebody else has already done work on SD/MMC cards then they can clarify follwing point(pl ref pg 87,88 ,100, 101 & 113 of manual)

(1) Can clock be stopped? what is requirment of minimum 8 clock cycles after command or data response packet.
(2) It is a minimu 8 clock cycle so more no of clock cycle can also be given? then how SC/MMC card will know that these clock cycle are not for clocking in next instrcuction ?
(3) Nac period (Read wait tiem after read command) should be clock running during this period ?




List of 7 messages in thread
TopicAuthorDate
Memory Cards - SD/MMC - Questions            01/01/70 00:00      
   Which manual are you referring?            01/01/70 00:00      
      Nice response -            01/01/70 00:00      
   Same Sandisk Manual            01/01/70 00:00      
      Somewhat? OK, then try again            01/01/70 00:00      
         Please give link            01/01/70 00:00      
            Already shown in my previous post            01/01/70 00:00      

Back to Subject List