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Diffstat (limited to 'rx/decode_terc4.v')
| -rwxr-xr-x | rx/decode_terc4.v | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/rx/decode_terc4.v b/rx/decode_terc4.v new file mode 100755 index 0000000..2c0f5a8 --- /dev/null +++ b/rx/decode_terc4.v @@ -0,0 +1,66 @@ +//////////////////////////////////////////////////////////////////////////////
+// Copyright (c) 2011, Andrew "bunnie" Huang
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation and/or
+// other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+// SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+`timescale 1 ps / 1ps
+
+module decode_terc4 (
+ input clkin, // pixel clock input
+ input rstin, // async. reset input (active high)
+ input [9:0] din, // data inputs: expect registered
+ output reg [3:0] dout // data outputs
+);
+ reg [9:0] din_r;
+
+ always @(posedge clkin or posedge rstin) begin
+ if( rstin ) begin
+ dout[3:0] <= 4'h0;
+ din_r <= 10'b0;
+ end else begin
+ din_r <= din;
+ case (din_r[9:0])
+ 10'b1010011100: dout[3:0] <= 4'b0000;
+ 10'b1001100011: dout[3:0] <= 4'b0001;
+ 10'b1011100100: dout[3:0] <= 4'b0010;
+ 10'b1011100010: dout[3:0] <= 4'b0011;
+ 10'b0101110001: dout[3:0] <= 4'b0100;
+ 10'b0100011110: dout[3:0] <= 4'b0101;
+ 10'b0110001110: dout[3:0] <= 4'b0110;
+ 10'b0100111100: dout[3:0] <= 4'b0111;
+ 10'b1011001100: dout[3:0] <= 4'b1000;
+ 10'b0100111001: dout[3:0] <= 4'b1001;
+ 10'b0110011100: dout[3:0] <= 4'b1010;
+ 10'b1011000110: dout[3:0] <= 4'b1011;
+ 10'b1010001110: dout[3:0] <= 4'b1100;
+ 10'b1001110001: dout[3:0] <= 4'b1101;
+ 10'b0101100011: dout[3:0] <= 4'b1110;
+ 10'b1011000011: dout[3:0] <= 4'b1111;
+ // no default to allow for maximum coding flexibility...
+ endcase // case (din_q)
+ end // else: !if( rstin )
+ end // always @ (posedge clkin or posedge rstin)
+
+endmodule // decode_terc4
+
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