diff options
Diffstat (limited to 'src/tb')
| -rw-r--r-- | src/tb/tb_wrapper.v | 121 |
1 files changed, 117 insertions, 4 deletions
diff --git a/src/tb/tb_wrapper.v b/src/tb/tb_wrapper.v index fae0934..c7619f0 100644 --- a/src/tb/tb_wrapper.v +++ b/src/tb/tb_wrapper.v @@ -2,6 +2,13 @@ module tb_wrapper;
+
+ //
+ // Test Vectors
+ //
+ `include "modexp_fpga_model_vectors.v";
+
+
/*
* Settings
*/
@@ -25,7 +32,7 @@ module tb_wrapper; */
reg bus_cs;
reg bus_we;
- reg [USE_OPERAND_ADDR_WIDTH+2:0] bus_addr;
+ reg [USE_OPERAND_ADDR_WIDTH+3:0] bus_addr;
reg [ 32-1:0] bus_wr_data;
wire [ 32-1:0] bus_rd_data;
@@ -47,7 +54,10 @@ module tb_wrapper; .read_data (bus_rd_data)
);
+ integer i;
reg [31: 0] tmp;
+ reg [383:0] shreg;
+ reg poll;
initial begin
//
rst_n = 0;
@@ -61,6 +71,8 @@ module tb_wrapper; //
rst_n = 1;
//
+ // read common registers to make sure core header reads out ok
+ //
read_reg('h00, tmp); // NAME0
read_reg('h01, tmp); // NAME1
read_reg('h02, tmp); // VERSION
@@ -74,11 +86,82 @@ module tb_wrapper; write_reg('h11, 32'd384); // MODULUS_BITS
read_reg ('h11, tmp);
//
+ write_reg('h10, 32'd0); // MODE
+ read_reg ('h10, tmp);
+ //
+ // fill in 384-bit modulus
+ //
+ shreg = N_384;
+ for (i=0; i<384/32; i=i+1) begin
+ write_bank(3'b000, i[USE_OPERAND_ADDR_WIDTH-1:0], shreg[31:0]);
+ shreg = shreg >> 32;
+ end
+ //
+ // start precomputation
+ //
+ write_reg('h08, 32'd0); // CONTROL.init = 0
+ write_reg('h08, 32'd1); // CONTROL.init = 1
+ //
+ // wait for precomputation to complete
+ //
+ poll = 1;
+ while (poll) begin
+ #10;
+ read_reg('h09, tmp); // tmp = STATUS
+ poll = ~tmp[0]; // poll = STATUS.ready
+ end
+ //
+ // move modulus-dependent coefficient and Montgomery factor
+ // from "output" to "input" banks
+ //
+ for (i=0; i<384/32; i=i+1) begin
+ read_bank (3'b100, i[USE_OPERAND_ADDR_WIDTH-1:0], tmp);
+ write_bank(3'b101, i[USE_OPERAND_ADDR_WIDTH-1:0], tmp);
+ read_bank (3'b110, i[USE_OPERAND_ADDR_WIDTH-1:0], tmp);
+ write_bank(3'b111, i[USE_OPERAND_ADDR_WIDTH-1:0], tmp);
+ end
+ //
+ // fill in 384-bit message
+ //
+ shreg = M_384;
+ for (i=0; i<384/32; i=i+1) begin
+ write_bank(3'b001, i[USE_OPERAND_ADDR_WIDTH-1:0], shreg[31:0]);
+ shreg = shreg >> 32;
+ end
+ //
+ // fill in 384-bit exponent
+ //
+ shreg = D_384;
+ for (i=0; i<384/32; i=i+1) begin
+ write_bank(3'b010, i[USE_OPERAND_ADDR_WIDTH-1:0], shreg[31:0]);
+ shreg = shreg >> 32;
+ end
+ //
+ // start exponentiation
+ //
+ write_reg('h08, 32'd0); // CONTROL.next = 0
+ write_reg('h08, 32'd2); // CONTROL.next = 1
+ //
+ // wait for exponentiation to complete
+ //
+ poll = 1;
+ while (poll) begin
+ #10;
+ read_reg('h09, tmp); // tmp = STATUS
+ poll = ~tmp[1]; // poll = STATUS.valid
+ end
+ //
+ // read result
+ //
+ for (i=0; i<384/32; i=i+1) begin
+ read_bank(3'b011, i[USE_OPERAND_ADDR_WIDTH-1:0], tmp);
+ shreg = {tmp, shreg[383:32]};
+ end
//
end
task read_reg;
- input [USE_OPERAND_ADDR_WIDTH+1:0] addr;
+ input [USE_OPERAND_ADDR_WIDTH+2:0] addr;
output [ 32-1:0] data;
begin
bus_cs = 1;
@@ -89,9 +172,23 @@ module tb_wrapper; data = bus_rd_data;
end
endtask
+
+ task read_bank;
+ input [ 2:0] bank;
+ input [USE_OPERAND_ADDR_WIDTH-1:0] addr;
+ output [ 32-1:0] data;
+ begin
+ bus_cs = 1;
+ bus_addr = {1'b1, bank, addr};
+ #10;
+ bus_cs = 0;
+ bus_addr = 'bX;
+ data = bus_rd_data;
+ end
+ endtask
task write_reg;
- input [USE_OPERAND_ADDR_WIDTH+1:0] addr;
+ input [USE_OPERAND_ADDR_WIDTH+2:0] addr;
input [ 32-1:0] data;
begin
bus_cs = 1;
@@ -104,6 +201,22 @@ module tb_wrapper; bus_addr = 'bX;
end
endtask
-
+
+ task write_bank;
+ input [ 2:0] bank;
+ input [USE_OPERAND_ADDR_WIDTH-1:0] addr;
+ input [ 32-1:0] data;
+ begin
+ bus_cs = 1;
+ bus_we = 1;
+ bus_addr = {1'b1, bank, addr};
+ bus_wr_data = data;
+ #10;
+ bus_cs = 0;
+ bus_we = 0;
+ bus_addr = 'bX;
+ end
+ endtask
+
endmodule
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