diff options
Diffstat (limited to 'src/rtl/rosc_entropy_core.v')
| -rw-r--r-- | src/rtl/rosc_entropy_core.v | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/src/rtl/rosc_entropy_core.v b/src/rtl/rosc_entropy_core.v index eb9dd6e..cd70f8a 100644 --- a/src/rtl/rosc_entropy_core.v +++ b/src/rtl/rosc_entropy_core.v @@ -60,9 +60,10 @@ module rosc_entropy_core( //---------------------------------------------------------------- // Parameters. //---------------------------------------------------------------- - parameter DEBUG_DELAY = 32'h002c4b40; - parameter NUM_SHIFT_BITS = 8'h20; - parameter SAMPLE_CLK_CYCLES = 8'hff; + localparam ADDER_WIDTH = 1; + localparam DEBUG_DELAY = 32'h002c4b40; + localparam NUM_SHIFT_BITS = 8'h20; + localparam SAMPLE_CLK_CYCLES = 8'hff; //---------------------------------------------------------------- @@ -123,18 +124,20 @@ module rosc_entropy_core( //---------------------------------------------------------------- // module instantiations. // - // 32 1-bit wide oscillators. We want them to run as fast as - // possible to maximize differences over time. + // 32 oscillators each ADDER_WIDTH wide. We want them to run + // as fast as possible to maximize differences over time. + // We also only sample the oscillators SAMPLE_CLK_CYCLES number + // of cycles. //---------------------------------------------------------------- genvar i; generate for(i = 0 ; i < 32 ; i = i + 1) begin: oscillators - rosc #(.WIDTH(1)) rosc_array(.clk(clk), + rosc #(.WIDTH(ADDER_WIDTH)) rosc_array(.clk(clk), .we(rosc_we), .reset_n(reset_n), - .opa(opa), - .opb(opb), + .opa(opa[(ADDER_WIDTH - 1) : 0]), + .opb(opb[(ADDER_WIDTH - 1) : 0]), .dout(rosc_dout[i]) ); end |