From 29fb6afd018c601a2e0c7376656d5e37beb565d6 Mon Sep 17 00:00:00 2001 From: "Pavel V. Shatov (Meister)" Date: Tue, 1 Oct 2019 15:01:43 +0300 Subject: Started working on the pipelined Montgomery modular multiplier. Currently can do the "square" part of the multiplication, i.e. compute the twice larger intermediate product AB = A * B. --- rtl/modexpng_recombinator_block.v | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 rtl/modexpng_recombinator_block.v (limited to 'rtl/modexpng_recombinator_block.v') diff --git a/rtl/modexpng_recombinator_block.v b/rtl/modexpng_recombinator_block.v new file mode 100644 index 0000000..efe0ac5 --- /dev/null +++ b/rtl/modexpng_recombinator_block.v @@ -0,0 +1,35 @@ +module modexpng_recombinator_block +( + clk, + ce, clr, + din, dout +); + + input clk; + input ce; + input clr; + input [46:0] din; + output [15:0] dout; + + reg [14:0] z; + reg [16:0] y; + reg [17:0] x; + //reg [15:0] w; + + //assign dout = w; + assign dout = x[15:0]; + + wire [14:0] din_z = din[46:32]; // TODO: maybe determine more precise bound here + wire [15:0] din_y = din[31:16]; + wire [15:0] din_x = din[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} + {{16{1'b0}}, x[17:16]}; + //w <= clr ? {16{1'bX}} : x[15:0]; + end + +endmodule -- cgit v1.2.3