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Recent content by cffyh

  1. C

    set_false_path & set_case_analysis

    set_false_path means the path is exist,but we don't want to check it; set_case_analysis will assign a constant value to a pin or port,and this value will will decide which arc(path) will be disabled!
  2. C

    Spartan 3E FPGA program failed

    The jumper is OK.M0M1M2=000 to choose master serial mode! ---------- Post added at 13:48 ---------- Previous post was at 13:42 ---------- Something strange!The lable attach to my CPLD chip shows that the CPLD is xc2c256,but ISE daisy chain scan shows the CPLD is xc2c64a!
  3. C

    Spartan 3E FPGA program failed

    My spartan 3E with xc3s500e FPGA,xcf04 PROM and xc2c64a CPLD come across some problems when programming！When I burn bit file into my board,the ISE show"program successed",the xc_done lighting and work normally,but when I burn mcs file into my board ,software shows “program successed",the xc_done...
  4. C

    CTS transition target

    The highest clock frequency of design is 2M. Does 2ns trsnsition target tough for CTS? This is my first time to do CTS.
  5. C

    Signle clock CTS,which clock has priority?

    CTS for a signle clock,which clock has priority:Root clock or the generate(divided) clock?
  6. C

    [SOLVED] db file used in Astro

    It is recommended NOT to make any edits to db when ctiCTS is up! why?
  7. C

    [SOLVED] How to "set drive" and "set load" in DC?

    Is there any priciple to set these parameter or just trial and error?
  8. C

    i want a tutorial for synopsys DC

    Thx for sharing!
  9. C

    Two questions about PR with Astro

    According to your answer,when my design use 4 metal I should use metal4 and metal 3 for PWR,am I right?
  10. C

    How do we fix global skew

    During CTS,when you choose globe skew,skew=longest path-shortest path,how does negative skew take place? Maybe you have chosen local skew,skew=endpoint-startpoint.
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