Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Setup Hold times for Cyclone IV Flops

Hi All, I have looked in Cyclone IV Handbook and did not find T'su or T'hold for the flops. Is this info available somewhere? Can I safely assume t'hold to be zero? I am also trying to ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Since your clocks are in phase then you can do this:

process

begin

wait until clk_2x = '1';

if clk_1x = '1' then

data_out <= data1;

else

data_out <= data2;

end of;

end process;