Jan 26, 2003 #1 K kinysh Member level 3 Joined Jul 16, 2002 Messages 65 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 509 sdram interface Hi: I have a sdram interface. The sdram chip only drive the data to about 2.0v as high. how could this happen. the sdram controller chip can drive the data onto 2.8v. How could this happen, however all the timing is correct. can anyone help me?
sdram interface Hi: I have a sdram interface. The sdram chip only drive the data to about 2.0v as high. how could this happen. the sdram controller chip can drive the data onto 2.8v. How could this happen, however all the timing is correct. can anyone help me?
Jan 26, 2003 #2 ted Full Member level 3 Joined Mar 12, 2002 Messages 182 Helped 28 Reputation 56 Reaction score 24 Trophy points 1,298 Activity points 2,866 It would be substantially easier to try to help you if you would tell exactly which chips you use and which power supply voltages are present. The more details you give for your particular design (even a fragment of the schematics might help), the more easier it is to understand the issue! Ted
It would be substantially easier to try to help you if you would tell exactly which chips you use and which power supply voltages are present. The more details you give for your particular design (even a fragment of the schematics might help), the more easier it is to understand the issue! Ted
Jan 26, 2003 #3 K kinysh Member level 3 Joined Jul 16, 2002 Messages 65 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 509 Hi: Thanks a lot. I finally find the problem. We use a seperate power supply for sdram, and the sdram is not even powered on. Seems there is some coupling power from other pin make the sdram work. I have never met this before. Bests kinysh
Hi: Thanks a lot. I finally find the problem. We use a seperate power supply for sdram, and the sdram is not even powered on. Seems there is some coupling power from other pin make the sdram work. I have never met this before. Bests kinysh