VLSI PHYSICAL DESIGN

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The synthesis stage

on March 20, 2024

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Clock Groups

Clock Groups When multiple clocks exist in a design, you can use the set_clock_groups command to specify the relationships between the clocks. Doing so allows PrimeTime SI to correctly analyze the crosstalk interactions between the clocks. The -group option specifies the names of the clocks that belong to a group, whereas the -name option assigns an arbitrary name to the group. The remaining options specify the relationship between the clocks in the group. The clocks in a group can be defined as logically exclusive, physically exclusive, or asynchronous. Two clocks defined to be logically exclusive of each other have no logical timing paths between them. PrimeTime does not check the logical timing between the clocks, but PrimeTime SI still checks for possible crosstalk interaction between them. Two clocks defined to be physically exclusive of each other have no logical timing paths between them, and furthermore, are considered physically isolated fro...

ICC II commands

#start GUI icc_shell>start_gui #report max transition constaints icc_shell> report_constraint -max_transition -verbose #report timing with transition with pins (through that pin) icc_shell> report_timing -thr <instance_name>/<pin_name> #report timing from register clk to d of next flipflop icc_shell> report_timing -to <instance1_name>/<pin_name> -from <instance2_name>/clk #see complete clock path icc_shell>report_timing -to <pin_name> -path_type full_clock_expanded -delay max #high light path in GUI icc_shell>change_selection [get_timing_paths -to <instace_name>/<pin>] #see clock tree information icc_shell>report_clock_tree #shows the worst path timing with the given clock icc_shell>report_timing -group <group_name> #prints only end points icc_shell>report_timing -to readary -path_type short -max_paths 5 #summary of all icc_shell>report_qor #insert buffer icc_shell>insert_buffer <...

Linux & VIM command

Basic commands cp mv cat less more tail head wc chmod pipes and redirection basic permissions Filename wildcards grep -A n ### prints n lines before the specified word grep -B n ### prints n lines after the specified word Vim shortcuts v for visual mode esc Normal mode for navigating through the documents : command mode i insert mode % across all lines s substitute /g global otherwise it will execute only once per line :n jump to line number n u undo ctrl +r redo H,M,L shifting cursor on page h, j ,k ,l cursor navigation shift + g shift to end of file gg shift to beginning of file Insert mode i change to insert mode at beginning of cursor position I change to insert mode at beginning of the line o change to insert mode with new l...

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The synthesis stage

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