| Line 677... |
Line 677... |
endgenerate
|
endgenerate
|
endmodule
|
endmodule
|
`timescale 1ns/1ns
|
`timescale 1ns/1ns
|
module vl_io_dff_oe ( d_i, d_o, oe, io_pad, clk, rst);
|
module vl_io_dff_oe ( d_i, d_o, oe, io_pad, clk, rst);
|
parameter width = 1;
|
parameter width = 1;
|
|
parameter reset_value = 1'b0;
|
input [width-1:0] d_o;
|
input [width-1:0] d_o;
|
output reg [width-1:0] d_i;
|
output reg [width-1:0] d_i;
|
input oe;
|
input oe;
|
inout [width-1:0] io_pad;
|
inout [width-1:0] io_pad;
|
input clk, rst;
|
input clk, rst;
|
| Line 696... |
Line 697... |
oe_q[i] <= 1'b0;
|
oe_q[i] <= 1'b0;
|
else
|
else
|
oe_q[i] <= oe_d[i];
|
oe_q[i] <= oe_d[i];
|
always @ (posedge clk or posedge rst)
|
always @ (posedge clk or posedge rst)
|
if (rst)
|
if (rst)
|
d_o_q[i] <= 1'b0;
|
d_o_q[i] <= reset_value;
|
else
|
else
|
d_o_q[i] <= d_o[i];
|
d_o_q[i] <= d_o[i];
|
always @ (posedge clk or posedge rst)
|
always @ (posedge clk or posedge rst)
|
if (rst)
|
if (rst)
|
d_i[i] <= 1'b0;
|
d_i[i] <= reset_value;
|
else
|
else
|
d_i[i] <= io_pad[i];
|
d_i[i] <= io_pad[i];
|
assign #1 io_pad[i] = (oe_q[i]) ? d_o_q[i] : 1'bz;
|
assign #1 io_pad[i] = (oe_q[i]) ? d_o_q[i] : 1'bz;
|
end
|
end
|
endgenerate
|
endgenerate
|
| Line 5166... |
Line 5167... |
assign result = (opcode==opcode_and) ? a & b :
|
assign result = (opcode==opcode_and) ? a & b :
|
(opcode==opcode_or) ? a | b :
|
(opcode==opcode_or) ? a | b :
|
(opcode==opcode_xor) ? a ^ b :
|
(opcode==opcode_xor) ? a ^ b :
|
b;
|
b;
|
endmodule
|
endmodule
|
|
module vl_arith_unit ( a, b, c_in, add_sub, sign, result, c_out, z, ovfl);
|
|
parameter width = 32;
|
|
parameter opcode_add = 1'b0;
|
|
parameter opcode_sub = 1'b1;
|
|
input [width-1:0] a,b;
|
|
input c_in, add_sub, sign;
|
|
output [width-1:0] result;
|
|
output c_out, z, ovfl;
|
|
assign {c_out,result} = {(a[width-1] & sign),a} + ({a[width-1] & sign,b} ^ {(width+1){(add_sub==opcode_sub)}}) + {{(width-1){1'b0}},(c_in | (add_sub==opcode_sub))};
|
|
assign z = (result=={width{1'b0}});
|
|
assign ovfl = ( a[width-1] & b[width-1] & ~result[width-1]) |
|
|
(~a[width-1] & ~b[width-1] & result[width-1]);
|
|
endmodule
|
|
module vl_count_unit (din, dout, opcode);
|
|
parameter width = 32;
|
|
input [width-1:0] din;
|
|
output [width-1:0] dout;
|
|
input opcode;
|
|
integer i;
|
|
wire [width/32+4:0] ff1, fl1;
|
|
/*
|
|
always @(din) begin
|
|
ff1 = 0; i = 0;
|
|
while (din[i] == 0 && i < width) begin // complex condition
|
|
ff1 = ff1 + 1;
|
|
i = i + 1;
|
|
end
|
|
end
|
|
always @(din) begin
|
|
fl1 = width; i = width-1;
|
|
while (din[i] == 0 && i >= width) begin // complex condition
|
|
fl1 = fl1 - 1;
|
|
i = i - 1;
|
|
end
|
|
end
|
|
*/
|
|
generate
|
|
if (width==32) begin
|
|
assign ff1 = din[0] ? 6'd1 :
|
|
din[1] ? 6'd2 :
|
|
din[2] ? 6'd3 :
|
|
din[3] ? 6'd4 :
|
|
din[4] ? 6'd5 :
|
|
din[5] ? 6'd6 :
|
|
din[6] ? 6'd7 :
|
|
din[7] ? 6'd8 :
|
|
din[8] ? 6'd9 :
|
|
din[9] ? 6'd10 :
|
|
din[10] ? 6'd11 :
|
|
din[11] ? 6'd12 :
|
|
din[12] ? 6'd13 :
|
|
din[13] ? 6'd14 :
|
|
din[14] ? 6'd15 :
|
|
din[15] ? 6'd16 :
|
|
din[16] ? 6'd17 :
|
|
din[17] ? 6'd18 :
|
|
din[18] ? 6'd19 :
|
|
din[19] ? 6'd20 :
|
|
din[20] ? 6'd21 :
|
|
din[21] ? 6'd22 :
|
|
din[22] ? 6'd23 :
|
|
din[23] ? 6'd24 :
|
|
din[24] ? 6'd25 :
|
|
din[25] ? 6'd26 :
|
|
din[26] ? 6'd27 :
|
|
din[27] ? 6'd28 :
|
|
din[28] ? 6'd29 :
|
|
din[29] ? 6'd30 :
|
|
din[30] ? 6'd31 :
|
|
din[31] ? 6'd32 :
|
|
6'd0;
|
|
assign fl1 = din[31] ? 6'd32 :
|
|
din[30] ? 6'd31 :
|
|
din[29] ? 6'd30 :
|
|
din[28] ? 6'd29 :
|
|
din[27] ? 6'd28 :
|
|
din[26] ? 6'd27 :
|
|
din[25] ? 6'd26 :
|
|
din[24] ? 6'd25 :
|
|
din[23] ? 6'd24 :
|
|
din[22] ? 6'd23 :
|
|
din[21] ? 6'd22 :
|
|
din[20] ? 6'd21 :
|
|
din[19] ? 6'd20 :
|
|
din[18] ? 6'd19 :
|
|
din[17] ? 6'd18 :
|
|
din[16] ? 6'd17 :
|
|
din[15] ? 6'd16 :
|
|
din[14] ? 6'd15 :
|
|
din[13] ? 6'd14 :
|
|
din[12] ? 6'd13 :
|
|
din[11] ? 6'd12 :
|
|
din[10] ? 6'd11 :
|
|
din[9] ? 6'd10 :
|
|
din[8] ? 6'd9 :
|
|
din[7] ? 6'd8 :
|
|
din[6] ? 6'd7 :
|
|
din[5] ? 6'd6 :
|
|
din[4] ? 6'd5 :
|
|
din[3] ? 6'd4 :
|
|
din[2] ? 6'd3 :
|
|
din[1] ? 6'd2 :
|
|
din[0] ? 6'd1 :
|
|
6'd0;
|
|
assign dout = (!opcode) ? {{26{1'b0}}, ff1} : {{26{1'b0}}, fl1};
|
|
end
|
|
endgenerate
|
|
generate
|
|
if (width==64) begin
|
|
assign ff1 = 7'd0;
|
|
assign fl1 = 7'd0;
|
|
assign dout = (!opcode) ? {{57{1'b0}}, ff1} : {{57{1'b0}}, fl1};
|
|
end
|
|
endgenerate
|
|
endmodule
|
|
module vl_ext_unit ( a, b, F, result, opcode);
|
|
parameter width = 32;
|
|
input [width-1:0] a, b;
|
|
input F;
|
|
output reg [width-1:0] result;
|
|
input [2:0] opcode;
|
|
generate
|
|
if (width==32) begin
|
|
always @ (a or b or F or opcode)
|
|
begin
|
|
case (opcode)
|
|
3'b000: result = {{24{1'b0}},a[7:0]};
|
|
3'b001: result = {{24{a[7]}},a[7:0]};
|
|
3'b010: result = {{16{1'b0}},a[7:0]};
|
|
3'b011: result = {{16{a[15]}},a[15:0]};
|
|
3'b110: result = (F) ? a : b;
|
|
default: result = {b[15:0],16'h0000};
|
|
endcase
|
|
end
|
|
end
|
|
endgenerate
|
|
generate
|
|
if (width==64) begin
|
|
always @ (a or b or F or opcode)
|
|
begin
|
|
case (opcode)
|
|
3'b000: result = {{56{1'b0}},a[7:0]};
|
|
3'b001: result = {{56{a[7]}},a[7:0]};
|
|
3'b010: result = {{48{1'b0}},a[7:0]};
|
|
3'b011: result = {{48{a[15]}},a[15:0]};
|
|
3'b110: result = (F) ? a : b;
|
|
default: result = {32'h00000000,b[15:0],16'h0000};
|
|
endcase
|
|
end
|
|
end
|
|
endgenerate
|
|
endmodule
|
|
|
No newline at end of file
|
No newline at end of file
|
