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Cog STart Up Time — Parallax Forums

Cog STart Up Time

BatangBatang Posts: 234
edited 2011-06-16 06:43 in Propeller 1
This has probably been answered before but search did not give any results.

What is the typical start time for cognew?

Cheers

Comments

  • kuronekokuroneko Posts: 3,623
    edited 2011-06-15 21:51
    About 8K cycles (512 longs * 16 cycles per hub window). Plus some minor overhead depending on which cog does the cognew and which cog is started. Detailed at [post=864343]Propeller Tricks & Traps[/post] (bottom half).

    Note that starting a SPIN cog has an extra penaltyA re: stack/parameter setup especially if done from SPIN.


    A We are talking 300%+ here in cycle count.
  • BatangBatang Posts: 234
    edited 2011-06-15 22:13
    Hi kuroneko,

    Thanks for that.

    This info should be in the datasheet.
  • jazzedjazzed Posts: 11,803
    edited 2011-06-16 06:43
    Batang wrote: »
    This info should be in the datasheet.
    It's there sort of. It's just not obvious.
    Propeller Datasheet v1.2 Rev 1.2 4/24/2009
    Page 30 9.6. Current Profile at Various Startup Conditions
    640us at 12MHz does not make perfect sense, but it's close.
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