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Understanding Hold time
Hold time violation is the serious problem for a chip design. the clk time ended before the data ended , this is hold violation.
If there are setup violation, the chip maybe be operate at low frequency, but hold violation,the chip will not work at any frequency.
icfb layout symbol
you can define as below in the cds.lib file in the directory you start up the icfb.
DEFINE <libname> <libpath/libname>
example:
DEFINE stdcell_lib /xxx/xxx/stdcell_lib
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