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4-bit ring counter. Reset initializes the register to "0001". On each rising edge, the pattern rotates left: 0001 → 0010 → 0100 → 1000 → 0001...
| Signal | Direction | Width | Description |
|---|---|---|---|
i_clk | Input | 1 bit | System clock |
i_reset | Input | 1 bit | Active-high async reset |
o_q | Output | 4 bits | Counter output |