need more infomation about TimeQuest

Altera_Forum · ‎01-24-2008

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

set ad_data_board_delay_min 3

set ad_data_tco_max 2

set ad_data_tco_min 1

set max_delay $ad_clock_period/2 + $ad_sclk_board_delay_max + $ad_data_board_delay_max + $ad_data_tco_max

set min_delay $ad_clock_period/2 + $ad_sclk_board_delay_min + $ad_data_board_delay_min + $ad_data_tco_min

But after *.sdc being reading into TimeQuest, error occur:

Error: wrong# args: should be "set varName ?newValue?"

while executing

"set max_delay $ad_clock_period/2 + $ad_sclk_board_delay_max + $ad_data_board_delay_max + $ad_data_tco_max"

(file "E:/Altera_Project/QuartusII/FreqMeasure/FreqMeasure_AvalonInterface.sdc" line 190)

Any response will be very appreciated.

Altera_Forum · ‎01-24-2008

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...)

Altera_Forum · ‎01-24-2008

Thanks...

That will be a good start to learn tcl :)