From 1b703d3f03eaaf55d2475ee803d546ad4cfc6663 Mon Sep 17 00:00:00 2001
From: "William D. Jones" <thor0505@comcast.net>
Date: Sat, 21 Nov 2020 11:53:30 -0500
Subject: [PATCH] machxo2: Add FACADE_SLICE simulation model.

---
 techlibs/machxo2/cells_sim.v | 83 ++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/techlibs/machxo2/cells_sim.v b/techlibs/machxo2/cells_sim.v
index 8d93a4a33..89a66be7f 100644
--- a/techlibs/machxo2/cells_sim.v
+++ b/techlibs/machxo2/cells_sim.v
@@ -68,3 +68,86 @@ module FACADE_FF #(
 		end
 	endgenerate
 endmodule
+
+module PFUMX (input ALUT, BLUT, C0, output Z);
+	assign Z = C0 ? ALUT : BLUT;
+endmodule
+
+module L6MUX21 (input D0, D1, SD, output Z);
+	assign Z = SD ? D1 : D0;
+endmodule
+
+/* For consistency, input order matches TRELLIS_SLICE even though the BELs in
+prjtrellis were filled in clockwise order from bottom left. */
+module FACADE_SLICE #(
+	parameter MODE = "LOGIC",
+	parameter GSR = "ENABLED",
+	parameter SRMODE = "LSR_OVER_CE",
+	parameter CEMUX = "1",
+	parameter CLKMUX = "0",
+	parameter LSRMUX = "LSR",
+	parameter LSRONMUX = "LSRMUX",
+	parameter LUT0_INITVAL = 16'hFFFF,
+	parameter LUT1_INITVAL = 16'hFFFF,
+	parameter REG0_SD = "1",
+	parameter REG1_SD = "1",
+	parameter REG0_REGSET = "SET",
+	parameter REG1_REGSET = "SET",
+	parameter REG0_REGMODE = "FF",
+	parameter REG1_REGMODE = "FF",
+	parameter CCU2_INJECT1_0 = "YES",
+	parameter CCU2_INJECT1_1 = "YES",
+	parameter WREMUX = "INV"
+) (
+	input A0, B0, C0, D0,
+	input A1, B1, C1, D1,
+	input M0, M1,
+	input FCI, FXA, FXB,
+
+	input CLK, LSR, CE,
+	input DI0, DI1,
+
+	input WD0, WD1,
+	input WAD0, WAD1, WAD2, WAD3,
+	input WRE, WCK,
+
+	output F0, Q0,
+	output F1, Q1,
+	output FCO, OFX0, OFX1,
+
+	output WDO0, WDO1, WDO2, WDO3,
+	output WADO0, WADO1, WADO2, WADO3
+);
+
+	generate
+		if (MODE == "LOGIC") begin
+			L6MUX21 FXMUX (.D0(FXA), .D1(FXB), .SD(M1), .Z(OFX1));
+
+			wire k0;
+			wire k1;
+			PFUMX K0K1MUX (.ALUT(k1), .BLUT(k0), .C0(M0), .Z(OFX1));
+
+			LUT4 #(.INIT(LUT0_INITVAL)) LUT_0 (.A(A0), .B(B0), .C(C0), .D(D0), .Z(k0));
+			LUT4 #(.INIT(LUT0_INITVAL)) LUT_1 (.A(A0), .B(B0), .C(C0), .D(D0), .Z(k1));
+
+			assign F0 = k0;
+			assign F1 = k1;
+		end else if (MODE == "CCU2") begin
+			ERROR_UNSUPPORTED_SLICE_MODE error();
+		end else if (MODE == "DPRAM") begin
+			ERROR_UNSUPPORTED_SLICE_MODE error();
+		end else begin
+			ERROR_UNKNOWN_SLICE_MODE error();
+		end
+	endgenerate
+
+	wire di0 = (REG0_SD == "1") ? M0 : DI0;
+	wire di1 = (REG0_SD == "1") ? M1 : DI1;
+
+	FACADE_FF#(.GSR(GSR), .CEMUX(CEMUX), .CLKMUX(CLKMUX), .LSRMUX(LSRMUX),
+		.LSRONMUX(LSRONMUX), .SRMODE(SRMODE), .REGSET(REG0_REGSET),
+		.REGMODE(REG0_REGMODE)) REG_0 (.CLK(CLK), .DI(di0), .LSR(LSR), .CE(CE), .Q(Q0));
+	FACADE_FF#(.GSR(GSR), .CEMUX(CEMUX), .CLKMUX(CLKMUX), .LSRMUX(LSRMUX),
+		.LSRONMUX(LSRONMUX), .SRMODE(SRMODE), .REGSET(REG1_REGSET),
+		.REGMODE(REG1_REGMODE)) REG_1 (.CLK(CLK), .DI(di1), .LSR(LSR), .CE(CE), .Q(Q1));
+endmodule
-- 
2.30.2