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Altera_Forum's avatar
Altera_Forum
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18 years ago

need more infomation about TimeQuest

Hi, I hope to implement the following calculation in TimeQuest's *.sdc file, set ad_clock_period 80 set ad_sclk_board_delay_max 5 set ad_sclk_board_delay_min 3 set ad_data_board_delay_max 5 ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

To do calculations you have to use the expr command within square brackets:

set a 2.0

set b 3.0

set c [expr $a + $b]

So expr calculates the value, and the square brackets mean execute the commands inside and use their returned value.

Finally, I recommend using decimals for all numbers. In Tcl, integer types are handled differently than decimals, so:

expr 5 / 2

will return 2, not 2.5. (Dumb, I know, but it's part of the Tcl language...)