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I am synthesizing a processor design with RTL compiler. The synthesized netlist works fine and contains all necessary logic when I set a loose clock constraint (5000ps). But when I synthesized the same files with a tighter clock constraint (1800- 3000ps) the RTL compiler meets the constraint but randomly removes some of the registers(i.e Register file of the processor) in the synthesized netlist, which are required for proper operation of the design and are not some undriven or extra logic. Is there a way to instruct RTL compiler what not to remove?
The attributes I am using are as follows:
set_attribute hdl_track_filename_row_col true /set_attribute hdl_undriven_signal_value 0set_attribute hdl_infer_unresolved_from_logic_abstract false /set_attribute information_level 2
did you run logic equivalency checking with Conformal LEC? Did it pass?
If despite being logic equivalent you want to preseve the instances, simply do
set_attr preserve true <instances to preserve unconditionally>
In reply to grasshopper:
Thanks! I don't think I have access to Conformal LEC in University, I'll try preserve attribute command. As it turns out that some registers are just renamed by the synthesizer so I can't locate them in Netlist. I am now chenking the result in External memory.