diff options
Diffstat (limited to 'common/rtl')
| -rw-r--r-- | common/rtl/clkmgr_dcm.v | 147 | ||||
| -rw-r--r-- | common/rtl/ipcore/clkmgr_dcm.v | 152 | ||||
| -rw-r--r-- | common/rtl/novena_clkmgr.v | 53 | ||||
| -rw-r--r-- | common/rtl/novena_regs.v | 6 |
4 files changed, 182 insertions, 176 deletions
diff --git a/common/rtl/clkmgr_dcm.v b/common/rtl/clkmgr_dcm.v new file mode 100644 index 0000000..7c851f1 --- /dev/null +++ b/common/rtl/clkmgr_dcm.v @@ -0,0 +1,147 @@ +//====================================================================== +// +// clkmgr_dcm.v +// --------------- +// Xilinx DCM_SP primitive wrapper to avoid using Clocking Wizard IP core. +// +// +// 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 + ( + 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; // multiply factor for output clock frequency (2..32) + parameter CLK_OUT_DIV = 2; // divide factor for output clock frequency (1..32) + + + // + // DCM_SP + // + /* Xilinx-specific primitive. */ + 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 + // + /* DCM_SP requires BUFG primitive in its feedback path. */ + BUFG BUFG_feedback + ( + .I (dcm_clk_0), + .O (dcm_clk_feedback) + ); + + // + // Output Buffer + // + /* Connect system clock to global clocking network. */ + BUFG BUFG_output + ( + .I (dcm_clk_fx), + .O (clk_out) + ); + + +endmodule + +//====================================================================== +// EOF clkmgr_dcm.v +//====================================================================== diff --git a/common/rtl/ipcore/clkmgr_dcm.v b/common/rtl/ipcore/clkmgr_dcm.v deleted file mode 100644 index 6e57c3d..0000000 --- a/common/rtl/ipcore/clkmgr_dcm.v +++ /dev/null @@ -1,152 +0,0 @@ -// file: clkmgr_dcm.v
-//
-// (c) Copyright 2008 - 2011 Xilinx, Inc. All rights reserved.
-//
-// This file contains confidential and proprietary information
-// of Xilinx, Inc. and is protected under U.S. and
-// international copyright and other intellectual property
-// laws.
-//
-// DISCLAIMER
-// This disclaimer is not a license and does not grant any
-// rights to the materials distributed herewith. Except as
-// otherwise provided in a valid license issued to you by
-// Xilinx, and to the maximum extent permitted by applicable
-// law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND
-// WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES
-// AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING
-// BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-
-// INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and
-// (2) Xilinx shall not be liable (whether in contract or tort,
-// including negligence, or under any other theory of
-// liability) for any loss or damage of any kind or nature
-// related to, arising under or in connection with these
-// materials, including for any direct, or any indirect,
-// special, incidental, or consequential loss or damage
-// (including loss of data, profits, goodwill, or any type of
-// loss or damage suffered as a result of any action brought
-// by a third party) even if such damage or loss was
-// reasonably foreseeable or Xilinx had been advised of the
-// possibility of the same.
-//
-// CRITICAL APPLICATIONS
-// Xilinx products are not designed or intended to be fail-
-// safe, or for use in any application requiring fail-safe
-// performance, such as life-support or safety devices or
-// systems, Class III medical devices, nuclear facilities,
-// applications related to the deployment of airbags, or any
-// other applications that could lead to death, personal
-// injury, or severe property or environmental damage
-// (individually and collectively, "Critical
-// Applications"). Customer assumes the sole risk and
-// liability of any use of Xilinx products in Critical
-// Applications, subject only to applicable laws and
-// regulations governing limitations on product liability.
-//
-// THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS
-// PART OF THIS FILE AT ALL TIMES.
-//
-//----------------------------------------------------------------------------
-// User entered comments
-//----------------------------------------------------------------------------
-// None
-//
-//----------------------------------------------------------------------------
-// "Output Output Phase Duty Pk-to-Pk Phase"
-// "Clock Freq (MHz) (degrees) Cycle (%) Jitter (ps) Error (ps)"
-//----------------------------------------------------------------------------
-// CLK_OUT1____50.000______0.000______50.0______200.000____150.000
-//
-//----------------------------------------------------------------------------
-// "Input Clock Freq (MHz) Input Jitter (UI)"
-//----------------------------------------------------------------------------
-// __primary______________50____________0.010
-
-/*verilator lint_off PINCONNECTEMPTY*/
-/*verilator lint_off UNDRIVEN*/
-/*verilator lint_off UNUSED*/
-
-`timescale 1ps/1ps
-
-(* CORE_GENERATION_INFO = "clkmgr_dcm,clk_wiz_v3_6,{component_name=clkmgr_dcm,use_phase_alignment=true,use_min_o_jitter=false,use_max_i_jitter=false,use_dyn_phase_shift=false,use_inclk_switchover=false,use_dyn_reconfig=false,feedback_source=FDBK_AUTO,primtype_sel=DCM_SP,num_out_clk=1,clkin1_period=20.0,clkin2_period=20.0,use_power_down=false,use_reset=true,use_locked=false,use_inclk_stopped=true,use_status=false,use_freeze=false,use_clk_valid=true,feedback_type=SINGLE,clock_mgr_type=MANUAL,manual_override=false}" *)
-module clkmgr_dcm
- (// Clock in ports
- input CLK_IN1,
- // Clock out ports
- output CLK_OUT1,
- // Status and control signals
- input RESET,
- output INPUT_CLK_STOPPED,
- output CLK_VALID
- );
-
- // Input buffering
- //------------------------------------
- assign clkin1 = CLK_IN1;
-
-
- // Clocking primitive
- //------------------------------------
-
- // Instantiation of the DCM primitive
- // * Unused inputs are tied off
- // * Unused outputs are labeled unused
- wire psdone_unused;
- wire locked_int;
- wire [7:0] status_int;
- wire clkfb;
- wire clk0;
-
- DCM_SP
- #(.CLKDV_DIVIDE (2.000),
- .CLKFX_DIVIDE (1),
- .CLKFX_MULTIPLY (4),
- .CLKIN_DIVIDE_BY_2 ("FALSE"),
- .CLKIN_PERIOD (20.0),
- .CLKOUT_PHASE_SHIFT ("NONE"),
- .CLK_FEEDBACK ("1X"),
- .DESKEW_ADJUST ("SYSTEM_SYNCHRONOUS"),
- .PHASE_SHIFT (0),
- .STARTUP_WAIT ("FALSE"))
- dcm_sp_inst
- // Input clock
- (.CLKIN (clkin1),
- .CLKFB (clkfb),
- // Output clocks
- .CLK0 (clk0),
- .CLK90 (),
- .CLK180 (),
- .CLK270 (),
- .CLK2X (),
- .CLK2X180 (),
- .CLKFX (),
- .CLKFX180 (),
- .CLKDV (),
- // Ports for dynamic phase shift
- .PSCLK (1'b0),
- .PSEN (1'b0),
- .PSINCDEC (1'b0),
- .PSDONE (),
- // Other control and status signals
- .LOCKED (locked_int),
- .STATUS (status_int),
-
- .RST (RESET),
- // Unused pin- tie low
- .DSSEN (1'b0));
-
- assign INPUT_CLK_STOPPED = status_int[1];
- assign CLK_VALID = ( ( locked_int == 1'b 1 ) && ( status_int[1] == 1'b 0 ) );
-
- // Output buffering
- //-----------------------------------
- assign clkfb = CLK_OUT1;
-
- BUFG clkout1_buf
- (.O (CLK_OUT1),
- .I (clk0));
-
-
-
-
-endmodule
diff --git a/common/rtl/novena_clkmgr.v b/common/rtl/novena_clkmgr.v index 97db451..e8ef1bd 100644 --- a/common/rtl/novena_clkmgr.v +++ b/common/rtl/novena_clkmgr.v @@ -39,19 +39,21 @@ module novena_clkmgr ( - input wire gclk_p, // signal from clock pins - input wire gclk_n, // + input wire gclk_p, // signal from clock pins + input wire gclk_n, // - input wire reset_mcu_b, // cpu reset (async) + input wire reset_mcu_b, // cpu reset (async, active-low) - output wire sys_clk, // buffered system clock output - output wire sys_rst // system reset output (sync) + output wire sys_clk, // buffered system clock output + output wire sys_rst_n // system reset output (async set, sync clear, active-low) ); + // - // Ports + // Parameters // - + parameter CLK_OUT_MUL = 2; + parameter CLK_OUT_DIV = 2; // // IBUFGDS @@ -70,18 +72,23 @@ module novena_clkmgr // // DCM // - wire dcm_reset; // dcm reset - wire dcm_locked; // output clock valid + wire dcm_reset; // dcm reset + wire dcm_locked; // output clock valid wire gclk_missing; // no input clock - clkmgr_dcm dcm + clkmgr_dcm # ( - .CLK_IN1(gclk), - .RESET(dcm_reset), - .INPUT_CLK_STOPPED(gclk_missing), + .CLK_OUT_MUL (CLK_OUT_MUL), + .CLK_OUT_DIV (CLK_OUT_DIV) + ) + dcm + ( + .clk_in (gclk), + .reset_in (dcm_reset), + .gclk_missing_out (gclk_missing), - .CLK_OUT1(sys_clk), - .CLK_VALID(dcm_locked) + .clk_out (sys_clk), + .clk_valid_out (dcm_locked) ); @@ -90,7 +97,8 @@ module novena_clkmgr // /* DCM should be reset on power-up, when input clock is stopped or when the - * CPU gets reset. + * CPU gets reset. Note that DCM requires active-high reset, so the shift + * register is preloaded with 1's and gradually filled with 0's. */ reg [15: 0] dcm_rst_shreg = {16{1'b1}}; // 16-bit shift register @@ -109,18 +117,21 @@ module novena_clkmgr // System Reset Logic // - /* System reset is asserted for 16 cycles whenever DCM aquires lock. */ + /* System reset is asserted for 16 cycles whenever DCM aquires lock. Note + * that system reset is active-low, so the shift register is preloaded with + * 0's and gradually filled with 1's. + */ - reg [15: 0] sys_rst_shreg = {16{1'b1}}; // 16-bit shift register + reg [15: 0] sys_rst_shreg = {16{1'b0}}; // 16-bit shift register always @(posedge sys_clk or negedge reset_mcu_b or posedge gclk_missing or negedge dcm_locked) // if ((reset_mcu_b == 1'b0) || (gclk_missing == 1'b1) || (dcm_locked == 1'b0)) - sys_rst_shreg <= {16{1'b1}}; + sys_rst_shreg <= {16{1'b0}}; else if (dcm_locked == 1'b1) - sys_rst_shreg <= {sys_rst_shreg[14:0], 1'b0}; + sys_rst_shreg <= {sys_rst_shreg[14:0], 1'b1}; - assign sys_rst = sys_rst_shreg[15]; + assign sys_rst_n = sys_rst_shreg[15]; endmodule diff --git a/common/rtl/novena_regs.v b/common/rtl/novena_regs.v index eb89092..4edf028 100644 --- a/common/rtl/novena_regs.v +++ b/common/rtl/novena_regs.v @@ -42,7 +42,7 @@ module board_regs ( // Clock and reset. input wire clk, - input wire rst, + input wire reset_n, // Control. input wire cs, @@ -96,9 +96,9 @@ module board_regs //---------------------------------------------------------------- // storage registers for mapping memory to core interface //---------------------------------------------------------------- - always @ (posedge clk or posedge rst) + always @ (posedge clk or negedge reset_n) begin - if (rst) + if (!reset_n) begin reg_dummy <= {32{1'b0}}; end |