Occasional ContributorWarning: Node: WRN was determined to be a clock but was found without an associated clock assignment.
Hello, I have a input signal WRN (Write enable) driven by microcontroller. I use WRN's rising edge to read the data on the bus. The code fragment is:
IF ( WRN'event AND WRN= '1' ) THEN
datum <= adbus( 15 DOWNTO 0 );
Now, during compilation I get the warning "WRN was determined to be a clock but was found without an associated clock assignment" and the fitter reports "Design is too large" error.
please suggest how should I constrain the WRN signal in the SDC file to avoid the warning for a successful compilation. Thank you!
Update:
I created a rising edge detector signal 'WRN_re'
WRN_re <= (WRN_d XOR WRN) AND WRN; -- WRN_d is the delayed version of WRN (generated from a clocked process)
I used this signal to read data from the bus instead. The warning still exists. After checking the RTL viewer, I clearly see that WRN is never connected to clock pin of any flip flop.
Now I do not understand why the comiler is considering WRN as a clock and throwing the warning.
Also the new error pops up:
Error (332000): Following required options are missing: -clock
---------------------------------------------------------------------------
Usage: set_input_delay [-h | -help] [-long_help] [-add_delay] -clock <name> [-clock_fall] [-fall] [-max] [-min] [-reference_pin <name>] [-rise] [-source_latency_included] <delay> <targets>
-h | -help: Short help
-long_help: Long help with examples and possible return values
-add_delay: Create additional delay constraint instead of overriding previous constraints
-clock <name>: Clock name
-clock_fall: Specifies that input delay is relative to the falling edge of the clock
-fall: Specifies the falling input delay at the port
-max: Applies value as maximum data arrival time
-min: Applies value as minimum data arrival time
-reference_pin <name>: Specifies a port in the design to which the input delay is relative
-rise: Specifies the rising input delay at the port
-source_latency_included: Specifies that input delay includes added source latency
<delay>: Time value
<targets>: List of input port type objects
---------------------------------------------------------------------------
while executing
"set_input_delay –clock CONTCLK_IN 5 [get_ports WRN]"
The command in bold is the SDC command I have used for WRN. Is the syntax of the SDC command right? I followed the Quartus tutorial to write this command.
Requesting your help. Thank you in advance!
