Contents
What does SDC file contains?
Synopsys® Design Constraints File (. sdc) Definition. An ASCII text file (with the extension . sdc) that contains design constraints and timing assignments in the industry-standard Synopsys® Design Constraints format. You must create an SDC File to specify timing constraints when running the TimeQuest Timing Analyzer.
Whats is SDC?
SDC. Self-Directed Care (various organizations) SDC. Standards Development Committee.
Is it possible to synchronize the data just with SDC constraints?
There is 1-bit data from clk1 to clk2. I know this is a kind of asynchronous scenario and the traditional method is the use of 2 FFs or an asynchronous FIFO to synchronize the data. However, since these two clocks have a fixed phase difference, so is it possible to synchronize the data JUST with SDC constraints?
How to correctly specify timing constraints via SDC?
Ideally, the timing constraints should be unaffected by that. Define divide by 1 clocks on the and_* nets and declare them to be physically exclusive. Cadence RTL compiler handles the situation correctly by generating 3 timing paths for registers clocked by cpu_clk (one path each for one clock).
What are constraints for source clock and derived clock?
Basically clk2 rises at the 2nd edge of clk1, falls at the 3rd edge and rises again at the 4th edge. The 1-bit data has a half clock cycle to arrive the target FF. By the help of our constraint, the tool will perform setup/hold timing checks accordingly.
When do I update clock constraint in synthesis?
After synthesis, when this generic register is replaced with an actual register from library, the constraint will automatically be updated with the actual pin from the library cell. Consider the example shown in Figure 2, the flop-1 is clocked by CLKB, 500 MHz clock and the flop-2 is clocked by CLKA, a 333.3 MHz clock.