| Line 1... |
Line 1... |
// ============================================================================
|
// ============================================================================
|
// __
|
// __
|
// \\__/ o\ (C) 2020 Robert Finch, Waterloo
|
// \\__/ o\ (C) 2020-2022 Robert Finch, Waterloo
|
// \ __ / All rights reserved.
|
// \ __ / All rights reserved.
|
// \/_// robfinch@finitron.ca
|
// \/_// robfinch@finitron.ca
|
// ||
|
// ||
|
//
|
//
|
// mult64x64.sv
|
// mult64x64.sv
|
| Line 35... |
Line 35... |
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
//
|
//
|
// ============================================================================
|
// ============================================================================
|
|
|
|
//`define KARATSUBA 1
|
|
|
|
`ifdef KARATSUBA
|
|
|
module mult64x64(clk, ce, a, b, o);
|
module mult64x64(clk, ce, a, b, o);
|
input clk;
|
input clk;
|
input ce;
|
input ce;
|
input [63:0] a;
|
input [63:0] a;
|
input [63:0] b;
|
input [63:0] b;
|
| Line 60... |
Line 64... |
always @(posedge clk)
|
always @(posedge clk)
|
if (ce) b2 <= b1[32] ? -b1 : b1;
|
if (ce) b2 <= b1[32] ? -b1 : b1;
|
always @(posedge clk)
|
always @(posedge clk)
|
if (ce) sgn2 <= a1[32]^b1[32];
|
if (ce) sgn2 <= a1[32]^b1[32];
|
|
|
delay #(.WID(1), .DEP(7)) udl1 (.clk(clk), .ce(ce), .i(sgn2), .o(sgn9));
|
ft_delay #(.WID(1), .DEP(7)) udl1 (.clk(clk), .ce(ce), .i(sgn2), .o(sgn9));
|
always @(posedge clk)
|
always @(posedge clk)
|
if (ce) sgn10 <= sgn9;
|
if (ce) sgn10 <= sgn9;
|
|
|
// 6 cycle latency
|
// 6 cycle latency
|
mult32x32 u1 (
|
mult32x32 u1 (
|
| Line 115... |
Line 119... |
if (ce) z0d <= z0c;
|
if (ce) z0d <= z0c;
|
always @(posedge clk)
|
always @(posedge clk)
|
if (ce) o <= {z2d,z0d} + {z1,32'd0};
|
if (ce) o <= {z2d,z0d} + {z1,32'd0};
|
|
|
endmodule
|
endmodule
|
|
|
|
`else
|
|
|
|
// This version of the multiply has a parameterized pipeline depth and allows
|
|
// the tools to perform the multiply. Relies on the ability of tools to retime.
|
|
|
|
module mult64x64(clk, ce, a, b, o);
|
|
parameter DEP = 11;
|
|
input clk;
|
|
input ce;
|
|
input [63:0] a;
|
|
input [63:0] b;
|
|
output reg [127:0] o;
|
|
|
|
reg [127:0] prod [0:DEP-1];
|
|
reg [127:0] prd;
|
|
integer n;
|
|
|
|
always_ff @(posedge clk)
|
|
if (ce) prd <= a * b;
|
|
always_ff @(posedge clk)
|
|
if (ce) prod[0] <= prd;
|
|
|
|
always_ff @(posedge clk)
|
|
for (n = 0; n < DEP - 1; n = n + 1)
|
|
if (ce) prod[n+1] <= prod[n];
|
|
|
|
always_ff @(posedge clk)
|
|
if(ce) o <= prod[DEP-1];
|
|
|
|
endmodule
|
|
|
|
`endif
|
