Help identify symbols from Quartus RTL view.

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bteddy1

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Hello,

Need help with a couple symbols in a Quartus RTL view.

In the attached jpg I have drawn the symbols.

Questions:

What circuit is the circle with the plus in it representing?
What does the 10'H 200 mean?
The output is ten bits but only eight are shown going to input D.
Are all ten bits going to input D and only 8 are being read?

What circuit is the trapezoid representing?
What does the 1'H 1 mean?
What does hfc mean?

Thank You.
 

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10'h200 and 1'h1 are hex constants in verilog syntax. Review your verilog reference manual or tutorial.

What do you expect if an operator is designated as "add0" and marked with "+" symbol? Trapezoid represents a mux or selector.

RTL schematic bit widths are strictly copied from compiled HDL, even if redundant. You'll review the HDL code.

Expect that "count- hfc" refers to a HDL instance name.
 

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I have only seen adders as squares with A, B, Cin, Cout, Sum out. I have never seen a circle.
What type of adder is it?
Is hfc - high frequency clock or something else?
 

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