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  1. #1
    Junior Member level 3
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    Facing issue of long runtime to find a legal location for cell , in clock opt stage

    Searching legal location of lib cell "BUFFD1BWP240H11P57PDLVT" from (90.00300 227.28000), 4513629 attempts failed, current search location (0.57000 21.60000), current displacement 224.28224 um (934.50934 rows height)
    Warning: Could not find legal location for cell instance u_alb_srams/i_arccore_arccore0_bist_wrapper_top/arccore_bc_ram_0_inst/U1(BUFFD1BWP240H11P57PDLVT). (LGL-051)
    Warning: Detected unusual long runtime to find a legal location of lib cell "BUFFD1BWP240H8P57PDSVT"
    -- Searching legal location of lib cell "BUFFD1BWP240H8P57PDSVT" from (89.09100 224.64000), 4450984 attempts failed, current search location (0.57000 24.24000), current displacement 219.08018 um (912.83410 rows height)
    Warning: Could not find legal location for cell instance u_alb_srams/i_arccore_arccore0_bist_wrapper_top/arccore_bc_ram_0_inst/U2(BUFFD1BWP240H8P57PDSVT). (LGL-051)


    This keep running indefinitely

    any idea why this issue,
    I tried doing legalize placement before running clock opt
    tried putting soft blockage around the place where the tool is trying to place these cells.

    but the issue persists.tool : IC Compiler 2

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  2. #2
    Advanced Member level 5
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    Re: Facing issue of long runtime to find a legal location for cell , in clock opt st

    not sure what is going on. I suspect you messed up the flow or that your density is too high.
    Really, I am not Sam.



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