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[/] [csa/] [trunk/] [rtl/] [key_schedule.v] - Blame information for rev 32

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1 13 simon111 
// this key_schedule module
2 21 simon111 
module key_schedule(clk,rst,start,i_ck,busy,done,o_kk);
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        input             clk;
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        input             rst;
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        input             start;
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        input  [ 8*8-1:0] i_ck;
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        output            busy;
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        output            done;
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        output [56*8-1:0] o_kk;
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        reg    [56*8-1:0] o_kk;
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        reg    [     2:0] cnt;
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        wire   [ 8*8-1:0] ik;
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        wire   [ 8*8-1:0] okd;
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        wire   [ 8*8-1:0] oki;
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        reg    [ 8*8-1:0] ok_d;
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        reg               done;
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        reg               busy;
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        key_perm kpo(.i_key(ok_d), .o_key(okd));
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        key_perm kpi(.i_key(i_ck), .o_key(oki));
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24 21 simon111 
        always @(posedge clk)
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        begin
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                done <= 1'h0;
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                if(rst)
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                begin
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                        o_kk <= 448'h0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000;
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                        cnt  <= 3'h0;
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                        ok_d <= 64'h0000000000000000;
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                        busy <= 1'h0;
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                end
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                else
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                begin
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                        if(cnt==3'h0 && busy)
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                        begin
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                                busy <= 1'h0;
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                                done <= 1'h1;
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                        end
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                        if(start & ~busy)
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                        begin
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                                cnt  <= 3'h5;
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                                o_kk <= {o_kk [(6*8)*8-1:8*0], i_ck};
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                                busy <= 1'h1;
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                                ok_d <= oki;
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                                o_kk <= {o_kk [(6*8)*8-1:8*0],
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                                                oki ^ 64'h0606060606060606};
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                        end
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                        if(busy)
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                        begin
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                                o_kk <= {o_kk [(6*8)*8-1:8*0],
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                                                ok_d ^ {
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                                                        5'h00, cnt,
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                                                        5'h00, cnt,
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                                                        5'h00, cnt,
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                                                        5'h00, cnt,
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                                                        5'h00, cnt,
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                                                        5'h00, cnt,
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                                                        5'h00, cnt,
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                                                        5'h00, cnt
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                                                      }
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                                         };
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                                if(cnt!=3'h0)
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                                        cnt  <= cnt - 3'h1;
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                                ok_d <= okd;
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                        end
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                end
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        end
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//        wire   [64*8-1:0] kb;
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//        assign kb[(8*8)*8-1:(7*8)*8] = i_ck;
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//
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//        key_perm k1( .i_key(kb[(8*8)*8-1:(7*8)*8]) ,.o_key(kb[(7*8)*8-1:(6*8)*8]));
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//        key_perm k2( .i_key(kb[(7*8)*8-1:(6*8)*8]) ,.o_key(kb[(6*8)*8-1:(5*8)*8]));
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//        key_perm k3( .i_key(kb[(6*8)*8-1:(5*8)*8]) ,.o_key(kb[(5*8)*8-1:(4*8)*8]));
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//        key_perm k4( .i_key(kb[(5*8)*8-1:(4*8)*8]) ,.o_key(kb[(4*8)*8-1:(3*8)*8]));
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//        key_perm k5( .i_key(kb[(4*8)*8-1:(3*8)*8]) ,.o_key(kb[(3*8)*8-1:(2*8)*8]));
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//        key_perm k6( .i_key(kb[(3*8)*8-1:(2*8)*8]) ,.o_key(kb[(2*8)*8-1:(1*8)*8]));
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//        key_perm k7( .i_key(kb[(2*8)*8-1:(1*8)*8]) ,.o_key(kb[(1*8)*8-1:(0*8)*8]));
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//
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//        assign o_kk [(1*8)*8-1:(0*8)*8] = kb[(2*8)*8-1:(1*8)*8] ^ 64'h0000000000000000;
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//        assign o_kk [(2*8)*8-1:(1*8)*8] = kb[(3*8)*8-1:(2*8)*8] ^ 64'h0101010101010101;
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//        assign o_kk [(3*8)*8-1:(2*8)*8] = kb[(4*8)*8-1:(3*8)*8] ^ 64'h0202020202020202;
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//        assign o_kk [(4*8)*8-1:(3*8)*8] = kb[(5*8)*8-1:(4*8)*8] ^ 64'h0303030303030303;
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//        assign o_kk [(5*8)*8-1:(4*8)*8] = kb[(6*8)*8-1:(5*8)*8] ^ 64'h0404040404040404;
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//        assign o_kk [(6*8)*8-1:(5*8)*8] = kb[(7*8)*8-1:(6*8)*8] ^ 64'h0505050505050505;
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//        assign o_kk [(7*8)*8-1:(6*8)*8] = kb[(8*8)*8-1:(7*8)*8] ^ 64'h0606060606060606;
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95 13 simon111 
endmodule

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