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SDC file-HOLD and Setup Time

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Hi,
I am just starting using the nano encounter tool. I just wonder if the sdc file we give to the encounter tool should be the same as SDC file we give to the RTL compiler?
I want to connect my synthesized block to a memory with specific setup hold time. Does anyone has an idea how to give the encounter tool the specific setup time and hold time? how to put a constrain on its output and input port for setup and hold time?

Thanks,

Houman
 


Originally posted in cdnusers.org by houmanh
Parents

  • Hi,
    Hi,

    Thanks fo rthe information.
    Now my setup time is fine. But I still have problem with hold time.
    The problem is that the encounter tool disregard the hodl time I define for specific port in the sdc file using the command below:

    set_output_delay -clock [get_clocks {clk}] -min 0.4 [get_ports {mem_d}]

    where I want to have a 400ps hold time.
    when I look at the encounter log file it said that:
    "No hold time constrain read in"
    and even when I change the -min value and increase it close to the clock period I still have hold wns same as before!

    Do you have any idea about this?
    Thanks.

    Houman


    Originally posted in cdnusers.org by houmanh
Reply

  • Hi,
    Hi,

    Thanks fo rthe information.
    Now my setup time is fine. But I still have problem with hold time.
    The problem is that the encounter tool disregard the hodl time I define for specific port in the sdc file using the command below:

    set_output_delay -clock [get_clocks {clk}] -min 0.4 [get_ports {mem_d}]

    where I want to have a 400ps hold time.
    when I look at the encounter log file it said that:
    "No hold time constrain read in"
    and even when I change the -min value and increase it close to the clock period I still have hold wns same as before!

    Do you have any idea about this?
    Thanks.

    Houman


    Originally posted in cdnusers.org by houmanh
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