set_max_delay vs. set_input/output_delay

[eeStud]

Hi,

Can you please explain the differences between the commands? and when should i use it?

Thanks.

 

[vijayR15]

Maximum delays will always have the source or destination as a register we can also set from port to port. Mostly we will represent this by -from and -to . In the sense reg to out, in to reg and also from port -to port etc..,
ex:- set_max_delay 10.0 -from [get_pins inst_dfe_bist_inst_dphy_bist_esc_rx_0/done_rx_esc_sync_reg/Q]-to [get_ports bist_err_rx_esc_sync]


input or output delays will have the source or destination as a port.

ex:-set_input_delay -clock [get_clocks bist_int_TxByteClkHS] -add_delay -max 2.5 [get_ports dln_loop_back]

If you want add some delay from reg to port u should use set_max_delay..

If needs to add only for that specific port we can use set_input_delay