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// Synchronize RXD input & buffer
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// Synchronize RXD input & buffer
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//--------------------------------
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//--------------------------------
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reg [3:0] rxd_sync;
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reg [3:0] rxd_sync;
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always @ (posedge mclk or posedge por)
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always @ (posedge mclk or posedge por)
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if (por) rxd_sync <= 4'h0;
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if (por) rxd_sync <= 4'hf;
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else rxd_sync <= {rxd_sync[2:0], dbg_uart_rxd};
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else rxd_sync <= {rxd_sync[2:0], dbg_uart_rxd};
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// Majority decision
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// Majority decision
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//------------------------
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//------------------------
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reg rxd_maj;
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reg rxd_maj;
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