From fea771cc459e2aeec1177ad30464f591fc3a0bc5 Mon Sep 17 00:00:00 2001 From: "Pavel V. Shatov (Meister)" Date: Thu, 5 Jul 2018 21:39:55 +0300 Subject: Updated clock manager. --- rtl/alpha_clkmgr.v | 38 ++++++++++++++++++++++++-------------- 1 file changed, 24 insertions(+), 14 deletions(-) (limited to 'rtl') diff --git a/rtl/alpha_clkmgr.v b/rtl/alpha_clkmgr.v index f870a75..5c4099e 100644 --- a/rtl/alpha_clkmgr.v +++ b/rtl/alpha_clkmgr.v @@ -7,7 +7,7 @@ // // // Author: Pavel Shatov -// Copyright (c) 2016, NORDUnet A/S All rights reserved. +// Copyright (c) 2016, 2018 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 @@ -39,19 +39,28 @@ module alpha_clkmgr ( - input wire gclk, // signal from clock pin + input wire fmc_clk, // signal from clock pin - output wire sys_clk, // buffered system clock output + output wire sys_clk, // buffered system clock output output wire sys_rst_n // system reset output (async set, sync clear, active-low) ); // - // Parameters - // - parameter CLK_OUT_MUL = 20.0; - parameter CLK_OUT_DIV = 20.0; - + // Settings + // + + /* + * fmc_clk is 90 MHz, sys_clk is also 90 MHz routed through an MMCM. + * + * VCO frequency is 1080 MHz. + * + */ + localparam CLK_OUT_MUL = 12.0; + localparam CLK_OUT_DIV = 12.0; + localparam CLK_OUT_PHI = 45.0; + + // // Wrapper for Xilinx-specific MMCM (Mixed Mode Clock Manager) primitive. // @@ -63,21 +72,22 @@ module alpha_clkmgr clkmgr_mmcm # ( - .CLK_OUT_MUL (CLK_OUT_MUL), // 2..64 - .CLK_OUT_DIV (CLK_OUT_DIV) // 1..128 + .CLK_OUT_MUL (CLK_OUT_MUL), // 2..64 + .CLK_OUT_DIV (CLK_OUT_DIV), // 1..128 + .CLK_OUT_PHI (CLK_OUT_PHI) // 0.0..360.0 ) mmcm ( - .clk_in (gclk), + .gclk_in (fmc_clk), .reset_in (mmcm_reset), .gclk_out (gclk_int), .gclk_missing_out (gclk_missing), - .clk_out (sys_clk), + .clk_out (sys_clk), .clk_valid_out (mmcm_locked) ); - + // @@ -93,7 +103,7 @@ module alpha_clkmgr always @(posedge gclk_int or posedge gclk_missing) // - if ((gclk_missing == 1'b1)) + if (gclk_missing == 1'b1) mmcm_rst_shreg <= {16{1'b1}}; else mmcm_rst_shreg <= {mmcm_rst_shreg[14:0], 1'b0}; -- cgit v1.2.3