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Altera_Forum's avatar
Altera_Forum
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16 years ago

SOPC HP DDR2 Controller Clock Rate

I've installed a HP DDR2 Controller in the SOPC Builder. I'm curious what clock rate I can run this at. My memory can run at 400MHz CL = 3, 533MHz at CL = 4 and 667MHz at CL = 5. I'm running the controller at Half Rate.

AN-435 says for a -3 part the fMAX is 333MHz. The DDR and DDR2 HP Controller User Guide says 400MHz (Table 1-3). Who's right?

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  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    You could be absolutely correct. rogerleo has not responded as to what speed is actual memory device is. If he's got a DDR2-667 device then he will likely not get it to run at DDR2-800 speeds regardless of the FPGA.

    Jake