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How declare ALM synchronous signal (enable, sload, sclear) in vhdl

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Hello.
The basic cell in Intel FPGA have a wonderful architecture, including dedicated synchronous signals as enable, sload and sclear. However, describe the use of this resources is not easy in vhdl for me. I use "process" only for declare hardware associated whit registers.
Declare "enable" is easy:
if (enable) then --this use enable dedícate port
q <= xxxx;
end if;
Declare "sclear"...
if (sclr) then
--this use in RTL and Chip Planner a mux! i want sclr dedícate port
q <= (others => '0');
end if;
Declare "enable" and "sclear" use two mux. Now don't use
enable dedícate port.

How can use these precious resourses, synchronous dedícate ports?

Thanks!!

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