mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-08-09 04:31:25 +00:00
Code Activity

add negedge DFF

Browse source
This commit is contained in:
Pepijn de Vos 2019-10-21 12:31:11 +02:00
parent af7bdd598e
commit 8a2699c40c
2 changed files with 139 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

121
techlibs/gowin/cells_sim.v
View file

@ -31,14 +31,6 @@ module DFF (output reg Q, input CLK, D);
Q <= D;
endmodule
module DFFN (output reg Q, input CLK, D);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK)
Q <= D;
endmodule
module DFFE (output reg Q, input D, CLK, CE);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
@ -144,6 +136,119 @@ module DFFCE (output reg Q, input D, CLK, CE, CLEAR);
end
endmodule // DFFCE (positive clock edge; asynchronous clear; clock enable)
module DFFN (output reg Q, input CLK, D);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK)
Q <= D;
endmodule
module DFFNE (output reg Q, input D, CLK, CE);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK) begin
if (CE)
Q <= D;
end
endmodule // DFFNE (negative clock edge; clock enable)
module DFFNS (output reg Q, input D, CLK, SET);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK) begin
if (SET)
Q <= 1'b1;
else
Q <= D;
end
endmodule // DFFNS (negative clock edge; synchronous set)
module DFFNSE (output reg Q, input D, CLK, CE, SET);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK) begin
if (SET)
Q <= 1'b1;
else if (CE)
Q <= D;
end
endmodule // DFFNSE (negative clock edge; synchronous set takes precedence over clock enable)
module DFFNR (output reg Q, input D, CLK, RESET);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK) begin
if (RESET)
Q <= 1'b0;
else
Q <= D;
end
endmodule // DFFNR (negative clock edge; synchronous reset)
module DFFNRE (output reg Q, input D, CLK, CE, RESET);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK) begin
if (RESET)
Q <= 1'b0;
else if (CE)
Q <= D;
end
endmodule // DFFNRE (negative clock edge; synchronous reset takes precedence over clock enable)
module DFFNP (output reg Q, input D, CLK, PRESET);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK or posedge PRESET) begin
if(PRESET)
Q <= 1'b1;
else
Q <= D;
end
endmodule // DFFNP (negative clock edge; asynchronous preset)
module DFFNPE (output reg Q, input D, CLK, CE, PRESET);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK or posedge PRESET) begin
if(PRESET)
Q <= 1'b1;
else if (CE)
Q <= D;
end
endmodule // DFFNPE (negative clock edge; asynchronous preset; clock enable)
module DFFNC (output reg Q, input D, CLK, CLEAR);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK or posedge CLEAR) begin
if(CLEAR)
Q <= 1'b0;
else
Q <= D;
end
endmodule // DFFNC (negative clock edge; asynchronous clear)
module DFFNCE (output reg Q, input D, CLK, CE, CLEAR);
parameter [0:0] INIT = 1'b0;
initial Q = INIT;
always @(negedge CLK or posedge CLEAR) begin
if(CLEAR)
Q <= 1'b0;
else if (CE)
Q <= D;
end
endmodule // DFFNCE (negative clock edge; asynchronous clear; clock enable)
// TODO add more DFF sim cells
module VCC(output V);