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// Receive/Transmit buffer
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// Receive/Transmit buffer
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//-------------------------
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//-------------------------
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wire [19:0] xfer_buf_nxt = {rxd_s, xfer_buf[19:1]};
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wire [19:0] xfer_buf_nxt = {rxd_s, xfer_buf[19:1]};
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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) xfer_buf <= 18'h00000;
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if (por) xfer_buf <= 20'h00000;
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else if (dbg_rd_rdy) xfer_buf <= {1'b1, dbg_dout[15:8], 2'b01, dbg_dout[7:0], 1'b0};
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else if (dbg_rd_rdy) xfer_buf <= {1'b1, dbg_dout[15:8], 2'b01, dbg_dout[7:0], 1'b0};
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else if (xfer_bit_inc) xfer_buf <= xfer_buf_nxt;
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else if (xfer_bit_inc) xfer_buf <= xfer_buf_nxt;
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// Generate TXD output
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// Generate TXD output
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