utils.h

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/*a Types */

/*a Modules */
/*m hysteresis_switch */
extern
module hysteresis_switch( clock clk,
                          input bit reset_n,
                          input bit clk_enable "Assert to enable the internal clock; this permits I/O switches to easily use a slower clock",
                          input bit input_value,
                          output bit output_value,
                          input bit[16] filter_period "Period over which to filter the input - the larger the value, the longer it takes to switch, but the more glitches are removed",
                          input bit[16] filter_level  "Value to exceed to switch output levels - the larger the value, the larger the hysteresis; must be less than filter_period"
    )
{
    timing to   rising clock clk clk_enable;
    timing to   rising clock clk input_value, filter_period, filter_level;
    timing from rising clock clk output_value;
}