From af78b5570d2229631b287915c25ae3021e9f6982 Mon Sep 17 00:00:00 2001
From: "Pavel V. Shatov" <meisterpaul1@yandex.ru>
Date: Thu, 27 Aug 2015 00:30:26 +0400
Subject: Initial revision of FMC arbiter for Novena's on-board FPGA.

---
 src/verilog/clkmgr_dcm_new.v | 145 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 src/verilog/clkmgr_dcm_new.v

(limited to 'src/verilog/clkmgr_dcm_new.v')

diff --git a/src/verilog/clkmgr_dcm_new.v b/src/verilog/clkmgr_dcm_new.v
new file mode 100644
index 0000000..b281bc0
--- /dev/null
+++ b/src/verilog/clkmgr_dcm_new.v
@@ -0,0 +1,145 @@
+//======================================================================
+//
+// clkmgr_dcm_new.v
+// ---------------
+// Xilinx DCM_SP primitive wrapper to avoid using Clocking Wizard IP core.
+// FPGA framework.
+//
+//
+// Author: Pavel Shatov
+// Copyright (c) 2015, NORDUnet A/S All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// - Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+//
+// - Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+//
+// - Neither the name of the NORDUnet nor the names of its contributors may
+//   be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 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.
+//
+//======================================================================
+
+module clkmgr_dcm_new
+	(
+		input		wire	clk_in,
+      input		wire	reset_in,
+		
+      output	wire	gclk_missing_out,
+
+      output	wire	clk_out,
+      output	wire	clk_valid_out
+	);
+	
+		
+		//
+		// Parameters
+		//
+	parameter	CLK_OUT_MUL		= 2;
+	parameter	CLK_OUT_DIV		= 2;
+	
+	
+		//
+		// DCM_SP
+		//
+	wire				dcm_clk_0;
+	wire				dcm_clk_feedback;
+	wire 				dcm_clk_fx;
+	wire				dcm_locked_int;
+	wire	[ 7: 0]	dcm_status_int;
+	
+	DCM_SP #
+	(
+		.STARTUP_WAIT			("FALSE"),
+		.DESKEW_ADJUST			("SYSTEM_SYNCHRONOUS"),
+		.CLK_FEEDBACK			("1X"),
+		
+		.PHASE_SHIFT			(0),
+		.CLKOUT_PHASE_SHIFT	("NONE"),
+		
+		.CLKIN_PERIOD			(20.0),	// 50 MHz => 20 ns
+		.CLKIN_DIVIDE_BY_2	("FALSE"),
+		
+		.CLKDV_DIVIDE			(5.000),
+		.CLKFX_MULTIPLY		(CLK_OUT_MUL),
+		.CLKFX_DIVIDE			(CLK_OUT_DIV)
+	)
+	DCM_SP_inst
+	(
+		.RST			(reset_in),
+		
+		.CLKIN		(clk_in),
+		.CLKFB		(dcm_clk_feedback),
+		.CLKDV		(),
+		
+		.CLK0			(dcm_clk_0),
+		.CLK90		(),
+		.CLK180		(),
+		.CLK270		(),
+		
+		.CLK2X      (),
+		.CLK2X180	(),
+		
+		.CLKFX		(dcm_clk_fx),
+		.CLKFX180   (),
+		
+		.PSCLK		(1'b0),
+		.PSEN			(1'b0),
+		.PSINCDEC	(1'b0),
+		.PSDONE		(),
+
+		.LOCKED		(dcm_locked_int),
+		.STATUS		(dcm_status_int),
+
+		.DSSEN		(1'b0)
+	);
+
+
+		//
+		// Mapping
+		//
+	assign	gclk_missing_out	= dcm_status_int[1];
+	assign	clk_valid_out		= dcm_locked_int & ((dcm_status_int[2:1] == 2'b00) ? 1'b1 : 1'b0);
+
+
+		//
+		// Feedback
+		//
+	BUFG BUFG_feedback
+	(
+		.I		(dcm_clk_0),
+		.O		(dcm_clk_feedback)
+	);
+
+		//
+		// Output Buffer
+		//
+	BUFG BUFG_output
+	(
+		.I		(dcm_clk_fx),
+		.O		(clk_out)
+	);
+
+
+endmodule
+
+//======================================================================
+// EOF clkmgr_dcm_new.v
+//======================================================================
-- 
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