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Diffstat (limited to 'rtl/modexpng_recombinator_cell.v')
-rw-r--r-- | rtl/modexpng_recombinator_cell.v | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/rtl/modexpng_recombinator_cell.v b/rtl/modexpng_recombinator_cell.v new file mode 100644 index 0000000..0736072 --- /dev/null +++ b/rtl/modexpng_recombinator_cell.v @@ -0,0 +1,40 @@ +module modexpng_recombinator_cell +( + clk, + ce, clr, + din, dout +); + + // + // Headers + // + `include "../rtl/modexpng_parameters.vh" + + // + // Ports + // + input clk; + input ce; + input clr; + input [ MAC_W -1:0] din; + output [WORD_W -1:0] dout; + + reg [WORD_W -2:0] z; + reg [WORD_W :0] y; + reg [WORD_W +1:0] x; + + assign dout = x[WORD_W-1:0]; + + wire [WORD_W -2:0] din_z = din[3*WORD_W -2 :2*WORD_W]; // [46:32] + wire [WORD_W -1:0] din_y = din[2*WORD_W -1 : WORD_W]; // [31:16] + wire [WORD_W -1:0] din_x = din[ WORD_W -1 : 0]; // [15: 0] + + always @(posedge clk) + // + if (ce) begin + z <= din_z; + y <= clr ? {1'b0, din_y} : {1'b0, din_y} + {2'b00, z}; + x <= clr ? {2'b00, din_x} : {2'b00, din_x} + {1'b0, y} + {WORD_ZERO, x[WORD_EXT_W-1:WORD_W]}; + end + +endmodule |