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Results 1 to 5 of 5. Thread Tools Show Printable Version. It’s based on a bread-boaded Arduino UNO.

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Three LED’s will indicate the status, and then it will continue to loop. There is a serial port in the design, I use it for uploading the program.

But it could be used to print out info as the program runs.

Schematic and Source at this link: I watched all the signals on a logic analyzer and the timing appears to be good. The only things that I’m not quite clear on is the refresh cycle. The chip specs out a 4ms refresh cycle. My RAS loop takes around 14ms to cover 0 to rows.


Am I understanding the data sheet correctly?

Or am I covering the refresh ok? All the tests complete with no failures. If anyone has a compelling reason why this is running too slowly I can jettison the Arduino environment and just do straight AVR, though without trying it I’m not sure how much I will gain.


I am rambling at this point. I’m going to find some ‘s to test as well. Please play around with it.

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If you make it better let me know so I can update the project files. Originally Posted by guy. Something that you should be aware of is a start up requirement of these chips.

The following text are samples from only four datasheets. Any 8 cycles which perform refresh are adequate for this purpose. The eight RAS cycle wake-up should be repeated any time the refresh requirement is exceeded.

An initialization cycle is any cycle in which RAS is cycled. And so if you experience data read problems, it could be because the above is not being met.


Maybe you should add 8 dummy reads before any testing. Thanks guys, all good comments.

HYB Datasheet(PDF) – Siemens Semiconductor Group

Datashset, I caught the reversed power pins when I was comparing the data sheet of the I never powered up a chip thankfully before I realized that. I’m working on a straight AVR implementation with a larger chip. Hopefully I can get things tighter with more io pins.

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