diff options
Diffstat (limited to 'src/tb')
| -rw-r--r-- | src/tb/tb_wrapper.v | 52 |
1 files changed, 21 insertions, 31 deletions
diff --git a/src/tb/tb_wrapper.v b/src/tb/tb_wrapper.v index 054333e..c7619f0 100644 --- a/src/tb/tb_wrapper.v +++ b/src/tb/tb_wrapper.v @@ -71,6 +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
@@ -87,7 +89,7 @@ module tb_wrapper; write_reg('h10, 32'd0); // MODE
read_reg ('h10, tmp);
//
- // pre-calculate 384-bit quantities
+ // fill in 384-bit modulus
//
shreg = N_384;
for (i=0; i<384/32; i=i+1) begin
@@ -95,9 +97,13 @@ module tb_wrapper; 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;
@@ -105,58 +111,39 @@ module tb_wrapper; poll = ~tmp[0]; // poll = STATUS.ready
end
//
- // fill banks
+ // 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);
+ 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);
+ 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
//
- // wipe
- //
- shreg = {384{1'b0}};
- 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
- //
- write_reg('h08, 32'd0); // CONTROL.init = 0
- write_reg('h08, 32'd1); // CONTROL.init = 1
- //
- poll = 1;
- while (poll) begin
- #10;
- read_reg('h09, tmp); // tmp = STATUS
- poll = ~tmp[0]; // poll = STATUS.ready
- end
- //
- // restore
- //
- 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 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;
@@ -164,6 +151,8 @@ module tb_wrapper; 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]};
@@ -228,5 +217,6 @@ module tb_wrapper; bus_addr = 'bX;
end
endtask
+
endmodule
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