diff options
Diffstat (limited to 'fpga/usrp2/control_lib/priority_enc.v')
| -rw-r--r-- | fpga/usrp2/control_lib/priority_enc.v | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/fpga/usrp2/control_lib/priority_enc.v b/fpga/usrp2/control_lib/priority_enc.v new file mode 100644 index 000000000..d30870be9 --- /dev/null +++ b/fpga/usrp2/control_lib/priority_enc.v @@ -0,0 +1,61 @@ +// +// Copyright 2011 Ettus Research LLC +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. +// + + +module priority_enc + (input [31:0] in, + output reg [31:0] out); + + always @* + casex(in) + 32'b1xxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 31; + 32'b01xx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 30; + 32'b001x_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 29; + 32'b0001_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 28; + 32'b0000_1xxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 27; + 32'b0000_01xx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 26; + 32'b0000_001x_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 25; + 32'b0000_0001_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 24; + 32'b0000_0000_1xxx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 23; + 32'b0000_0000_01xx_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 22; + 32'b0000_0000_001x_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 21; + 32'b0000_0000_0001_xxxx_xxxx_xxxx_xxxx_xxxx : out <= 20; + 32'b0000_0000_0000_1xxx_xxxx_xxxx_xxxx_xxxx : out <= 19; + 32'b0000_0000_0000_01xx_xxxx_xxxx_xxxx_xxxx : out <= 18; + 32'b0000_0000_0000_001x_xxxx_xxxx_xxxx_xxxx : out <= 17; + 32'b0000_0000_0000_0001_xxxx_xxxx_xxxx_xxxx : out <= 16; + 32'b0000_0000_0000_0000_1xxx_xxxx_xxxx_xxxx : out <= 15; + 32'b0000_0000_0000_0000_01xx_xxxx_xxxx_xxxx : out <= 14; + 32'b0000_0000_0000_0000_001x_xxxx_xxxx_xxxx : out <= 13; + 32'b0000_0000_0000_0000_0001_xxxx_xxxx_xxxx : out <= 12; + 32'b0000_0000_0000_0000_0000_1xxx_xxxx_xxxx : out <= 11; + 32'b0000_0000_0000_0000_0000_01xx_xxxx_xxxx : out <= 10; + 32'b0000_0000_0000_0000_0000_001x_xxxx_xxxx : out <= 9; + 32'b0000_0000_0000_0000_0000_0001_xxxx_xxxx : out <= 8; + 32'b0000_0000_0000_0000_0000_0000_1xxx_xxxx : out <= 7; + 32'b0000_0000_0000_0000_0000_0000_01xx_xxxx : out <= 6; + 32'b0000_0000_0000_0000_0000_0000_001x_xxxx : out <= 5; + 32'b0000_0000_0000_0000_0000_0000_0001_xxxx : out <= 4; + 32'b0000_0000_0000_0000_0000_0000_0000_1xxx : out <= 3; + 32'b0000_0000_0000_0000_0000_0000_0000_01xx : out <= 2; + 32'b0000_0000_0000_0000_0000_0000_0000_001x : out <= 1; + 32'b0000_0000_0000_0000_0000_0000_0000_0001 : out <= 0; + 32'b0000_0000_0000_0000_0000_0000_0000_0000 : out <= 32'hFFFF_FFFF; + default : out <= 32'hFFFF_FFFF; + endcase // casex (in) + +endmodule // priority_enc |