alt_timestamp() question

@dsl:

Hey dsl!

Thanks for your fast reply.

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What you want to do is write a bit of vhld to divide sys_clk by 50, count those pulses, and make the 32bit value available to the bios cpu.

When I looked at the altera supplied 'timer' blocks, none of them do that!

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Grrr, and i thought creating a 32bit millisec clock would be a piece of cake and i could do it from sopc builder.

I was already thinking about that what you suggested: creating my own 32bit millisec clock via vhld (ok, i don't like vhdl - i prefer the schematic mode). But how would you make the 32bit value available to the bios(?) cpu? Via pio? Or is there a better way?

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Well 90 * 50000000 is 0x10c388d00 so what you have generated is a counter clocked by the 50MHz input clock that would generate an interrupt every millisecond.

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I would like to understand this quoted phrase, but i cannot figure out where the "90" comes from. Could you explain this to me - perhaps i am having a mental blackout.

Thanks for sharing your experience

FredFlintstone