Create a set of counters suitable for use as a 12-hour clock (with am/pm indicator). Your counters are clocked by a fast-running clk, with a pulse on ena whenever your clock should increment (i.e., once per second).
reset resets the clock to 12:00 AM. pm is 0 for AM and 1 for PM. hh, mm, and ss are two BCD (Binary-Coded Decimal) digits each for hours (01-12), minutes (00-59), and seconds (00-59). Reset has higher priority than enable, and can occur even when not enabled.
The following timing diagram shows the rollover behaviour from 11:59:59 AM to 12:00:00 PM and the synchronous reset and enable behaviour.
module top_module( input clk, input reset, input ena, output pm, output [7:0] hh, output [7:0] mm, output [7:0] ss);
Note that 11:59:59 PM advances to 12:00:00 AM, and 12:59:59 PM advances to 01:00:00 PM. There is no 00:00:00.
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