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Have been working on CortexM3. Have migrated to LPC1788. The SDRAM ICs interfaced on the demo board are no more produced by the manufacturers (and hence available with the distributors).
List of ICs: H57V2562GTR - Hynix K4S561632E-TC/UC - Samsung MT48LC16M16A2 - Micron
But the samsung distributor has suggested me to interface DDR2 RAM Ics whose operating frequencies above 500MHz. Can i interface DDR2 ICs with LPC1788? Is it possible to interface high frequency ICs with a slower controller? (Logically, it should be!!)
Apologies that i am asking the question here. But i am sure that the amount of knowledge that people here posses, the queries will be answered.
What does this have to do with Keil? Shouldn't you be asking NXP?
Apologies that i am asking the question here.
Not all information are available about the memory interface and all bits to configure it.
Which means that you really do need to contact NXP. They are the only ones who sits on the full information (or possibly ARM, if ARM happened to sell the memory interface block). But it isn't normally information people on this forum have access to.
There have been questions raised on the NXP forums, but till date remain unanswered. The DDR2 ICs are very fast. I m doubtful about their working.
Cant figure out what to do. Also lpc1788 cant be clocked above 120MHz.
Have you made a direct support request to NXP?
Have you made a direct support request to your disctributor/FAE?
Ya. I have made a direct technical support request, before 2 days at NXP.
Have read the construction, working and operation of SDRAM (synchronous DRAM) and all the ICs. and figured out that DDR2 and DDR3 are not backward compatible. infact, DDR2 and DDR3 operating voltage range is 0V - 1.5V.