lattice/ecp5/primitives/slice/TRELLIS_FF/TRELLIS_FF.sim.v

`default_nettype none
module TRELLIS_FF(input CLK, LSR, CE, DI, output reg Q);
	parameter GSR = "ENABLED";
	parameter [127:0] CEMUX = "1";
	parameter CLKMUX = "CLK";
	parameter LSRMUX = "LSR";
	parameter SRMODE = "LSR_OVER_CE";
	parameter REGSET = "RESET";

	reg muxce;
	always @(*)
		case (CEMUX)
			"1": muxce = 1'b1;
			"0": muxce = 1'b0;
			"INV": muxce = ~CE;
			default: muxce = CE;
		endcase

	wire muxlsr = (LSRMUX == "INV") ? ~LSR : LSR;
	wire muxclk = (CLKMUX == "INV") ? ~CLK : CLK;

	localparam srval = (REGSET == "SET") ? 1'b1 : 1'b0;

	initial Q = srval;

	generate
		if (SRMODE == "ASYNC") begin
			always @(posedge muxclk, posedge muxlsr)
				if (muxlsr)
					Q <= srval;
				else if (muxce)
					Q <= DI;
		end else begin
			always @(posedge muxclk)
				if (muxlsr)
					Q <= srval;
				else if (muxce)
					Q <= DI;
		end
	endgenerate
endmodule