Warning: Node: WRN was determined to be a clock but was found without an associated clock assignment.

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!