Difference between onehot() and onehot0()

SystemVerilog
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In reply to sk9:

Section 20.9 Bit vector system functions in the IEEE 1800-2017 SystemVerilog LRM answers this:

$onehot ( expression ) returns true (1’b1) if $countbits(expression,'1)**==**1, otherwise it
returns false (1’b0).

$onehot0 ( expression ) returns true (1’b1) if $countbits(expression,'1)**<=**1, otherwise it
returns false (1’b0).

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