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Altera_Forum's avatar
Altera_Forum
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14 years ago

Warning: Clock uncertainty characteristics of the Stratix V device family preliminary

hello guys i am getting multiple warnings with

1. Warning: Clock uncertainty characteristics of the Stratix V device family are preliminary

2. Warning: Clock uncertainty characteristics of the Stratix V device family are preliminary

3. Warning: Timing characteristics of device 5SGSMD8I2F45C2 are preliminary

In quartus II 11.0. With the same settings i dint get these warnings in quartus II 9.0 stratix IV...can anybody guide me with this..

I have no clarity what these warnings refer to :(

2 Replies

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

    Stratix V support is still early, the timing models are not finalized yet and probably won't be fore another release or two

    you really should upgrade to 11.1sp1 when targeting SV. the timing models will be better and support will be improved - but i expect the timing models are still considered "preliminary"

    in practice Altera fmax tends to go up as the models are refined