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pluto_hdl_adi/library/axi_pwm_gen/axi_pwm_gen.sv

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// ***************************************************************************
// ***************************************************************************
// Copyright (C) 2021-2023 Analog Devices, Inc. All rights reserved.
//
// In this HDL repository, there are many different and unique modules, consisting
// of various HDL (Verilog or VHDL) components. The individual modules are
// developed independently, and may be accompanied by separate and unique license
// terms.
//
// The user should read each of these license terms, and understand the
// freedoms and responsibilities that he or she has by using this source/core.
//
// This core is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE.
//
// Redistribution and use of source or resulting binaries, with or without modification
// of this file, are permitted under one of the following two license terms:
//
// 1. The GNU General Public License version 2 as published by the
// Free Software Foundation, which can be found in the top level directory
// of this repository (LICENSE_GPL2), and also online at:
// <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
//
// OR
//
// 2. An ADI specific BSD license, which can be found in the top level directory
// of this repository (LICENSE_ADIBSD), and also on-line at:
// https://github.com/analogdevicesinc/hdl/blob/master/LICENSE_ADIBSD
// This will allow to generate bit files and not release the source code,
// as long as it attaches to an ADI device.
//
// ***************************************************************************
// ***************************************************************************
`timescale 1ns/100ps
module axi_pwm_gen #(
parameter ID = 0,
parameter ASYNC_CLK_EN = 1,
parameter N_PWMS = 1,
parameter PWM_EXT_SYNC = 0,
parameter EXT_ASYNC_SYNC = 0,
parameter PULSE_0_WIDTH = 7,
parameter PULSE_1_WIDTH = 7,
parameter PULSE_2_WIDTH = 7,
parameter PULSE_3_WIDTH = 7,
parameter PULSE_4_WIDTH = 7,
parameter PULSE_5_WIDTH = 7,
parameter PULSE_6_WIDTH = 7,
parameter PULSE_7_WIDTH = 7,
parameter PULSE_8_WIDTH = 7,
parameter PULSE_9_WIDTH = 7,
parameter PULSE_10_WIDTH = 7,
parameter PULSE_11_WIDTH = 7,
parameter PULSE_12_WIDTH = 7,
parameter PULSE_13_WIDTH = 7,
parameter PULSE_14_WIDTH = 7,
parameter PULSE_15_WIDTH = 7,
parameter PULSE_0_PERIOD = 10,
parameter PULSE_1_PERIOD = 10,
parameter PULSE_2_PERIOD = 10,
parameter PULSE_3_PERIOD = 10,
parameter PULSE_4_PERIOD = 10,
parameter PULSE_5_PERIOD = 10,
parameter PULSE_6_PERIOD = 10,
parameter PULSE_7_PERIOD = 10,
parameter PULSE_8_PERIOD = 10,
parameter PULSE_9_PERIOD = 10,
parameter PULSE_10_PERIOD = 10,
parameter PULSE_11_PERIOD = 10,
parameter PULSE_12_PERIOD = 10,
parameter PULSE_13_PERIOD = 10,
parameter PULSE_14_PERIOD = 10,
parameter PULSE_15_PERIOD = 10,
parameter PULSE_0_OFFSET = 0,
parameter PULSE_1_OFFSET = 0,
parameter PULSE_2_OFFSET = 0,
parameter PULSE_3_OFFSET = 0,
parameter PULSE_4_OFFSET = 0,
parameter PULSE_5_OFFSET = 0,
parameter PULSE_6_OFFSET = 0,
parameter PULSE_7_OFFSET = 0,
parameter PULSE_8_OFFSET = 0,
parameter PULSE_9_OFFSET = 0,
parameter PULSE_10_OFFSET = 0,
parameter PULSE_11_OFFSET = 0,
parameter PULSE_12_OFFSET = 0,
parameter PULSE_13_OFFSET = 0,
parameter PULSE_14_OFFSET = 0,
parameter PULSE_15_OFFSET = 0
) (
// axi interface
input s_axi_aclk,
input s_axi_aresetn,
input s_axi_awvalid,
input [15:0] s_axi_awaddr,
input [ 2:0] s_axi_awprot,
output s_axi_awready,
input s_axi_wvalid,
input [31:0] s_axi_wdata,
input [ 3:0] s_axi_wstrb,
output s_axi_wready,
output s_axi_bvalid,
output [ 1:0] s_axi_bresp,
input s_axi_bready,
input s_axi_arvalid,
input [15:0] s_axi_araddr,
input [ 2:0] s_axi_arprot,
output s_axi_arready,
output s_axi_rvalid,
output [ 1:0] s_axi_rresp,
output [31:0] s_axi_rdata,
input s_axi_rready,
input ext_clk,
input ext_sync,
output pwm_0,
output pwm_1,
output pwm_2,
output pwm_3,
output pwm_4,
output pwm_5,
output pwm_6,
output pwm_7,
output pwm_8,
output pwm_9,
output pwm_10,
output pwm_11,
output pwm_12,
output pwm_13,
output pwm_14,
output pwm_15
);
// local parameters
localparam PWMS = N_PWMS-1;
localparam [31:0] CORE_VERSION = {16'h0002, /* MAJOR */
8'h00, /* MINOR */
8'h00}; /* PATCH */
localparam [31:0] CORE_MAGIC = 32'h601a3471; // PLSG
localparam reg [31:0] PULSE_WIDTH_G[15:0] = '{PULSE_0_WIDTH,
PULSE_1_WIDTH,
PULSE_2_WIDTH,
PULSE_3_WIDTH,
PULSE_4_WIDTH,
PULSE_5_WIDTH,
PULSE_6_WIDTH,
PULSE_7_WIDTH,
PULSE_8_WIDTH,
PULSE_9_WIDTH,
PULSE_10_WIDTH,
PULSE_11_WIDTH,
PULSE_12_WIDTH,
PULSE_13_WIDTH,
PULSE_14_WIDTH,
PULSE_15_WIDTH};
localparam reg [31:0] PULSE_PERIOD_G[0:15] = '{PULSE_0_PERIOD,
PULSE_1_PERIOD,
PULSE_2_PERIOD,
PULSE_3_PERIOD,
PULSE_4_PERIOD,
PULSE_5_PERIOD,
PULSE_6_PERIOD,
PULSE_7_PERIOD,
PULSE_8_PERIOD,
PULSE_9_PERIOD,
PULSE_10_PERIOD,
PULSE_11_PERIOD,
PULSE_12_PERIOD,
PULSE_13_PERIOD,
PULSE_14_PERIOD,
PULSE_15_PERIOD};
localparam reg [31:0] PULSE_OFFSET_G[0:15] = '{PULSE_0_OFFSET,
PULSE_1_OFFSET,
PULSE_2_OFFSET,
PULSE_3_OFFSET,
PULSE_4_OFFSET,
PULSE_5_OFFSET,
PULSE_6_OFFSET,
PULSE_7_OFFSET,
PULSE_8_OFFSET,
PULSE_9_OFFSET,
PULSE_10_OFFSET,
PULSE_11_OFFSET,
PULSE_12_OFFSET,
PULSE_13_OFFSET,
PULSE_14_OFFSET,
PULSE_15_OFFSET};
// internal registers
reg [PWMS:0] sync;
reg [31:0] offset_cnt = 32'd0;
reg offset_alignment = 1'b0;
reg pause_cnt_d = 1'b0;
// internal signals
wire clk;
wire up_clk;
wire up_rstn;
wire up_rreq_s;
wire up_wack_s;
wire up_rack_s;
wire [ 13:0] up_raddr_s;
wire [ 31:0] up_rdata_s;
wire up_wreq_s;
wire [ 13:0] up_waddr_s;
wire [ 31:0] up_wdata_s;
wire [ 15:0] pwm;
wire [ 31:0] pwm_width_s[0:PWMS];
wire [ 31:0] pwm_period_s[0:PWMS];
wire [ 31:0] pwm_offset_s[0:PWMS];
wire [ 15:0] pwm_armed;
wire load_config_s;
wire pwm_gen_resetn;
wire ext_sync_s;
wire pause_cnt;
assign up_clk = s_axi_aclk;
assign up_rstn = s_axi_aresetn;
axi_pwm_gen_regmap #(
.ID (ID),
.ASYNC_CLK_EN (ASYNC_CLK_EN),
.CORE_MAGIC (CORE_MAGIC),
.CORE_VERSION (CORE_VERSION),
.N_PWMS (PWMS),
.PULSE_WIDTH_G (PULSE_WIDTH_G),
.PULSE_PERIOD_G (PULSE_PERIOD_G),
.PULSE_OFFSET_G (PULSE_OFFSET_G)
) i_regmap (
.ext_clk (ext_clk),
.clk_out (clk),
.pwm_gen_resetn (pwm_gen_resetn),
.pwm_width (pwm_width_s),
.pwm_period (pwm_period_s),
.pwm_offset (pwm_offset_s),
.load_config (load_config_s),
.up_rstn (up_rstn),
.up_clk (up_clk),
.up_wreq (up_wreq_s),
.up_waddr (up_waddr_s),
.up_wdata (up_wdata_s),
.up_wack (up_wack_s),
.up_rreq (up_rreq_s),
.up_raddr (up_raddr_s),
.up_rdata (up_rdata_s),
.up_rack (up_rack_s));
// external sync
generate
reg ext_sync_m0 = 1'b1;
reg ext_sync_m1 = 1'b1;
if (EXT_ASYNC_SYNC) begin
always @(posedge clk) begin
if (pwm_gen_resetn == 1'b0) begin
ext_sync_m0 <= 1'b1;
ext_sync_m1 <= 1'b1;
end else begin
ext_sync_m0 <= (PWM_EXT_SYNC == 1) ? ext_sync : 0;
ext_sync_m1 <= ext_sync_m0;
end
end
assign ext_sync_s = ext_sync_m1;
end else begin
assign ext_sync_s = (PWM_EXT_SYNC == 1) ? ext_sync : 0;
end
endgenerate
// offset counter
always @(posedge clk) begin
if (offset_alignment == 1'b1 || pwm_gen_resetn == 1'b0) begin
offset_cnt <= 32'd0;
end else begin
offset_cnt <= offset_cnt + 1'b1;
end
if (pwm_gen_resetn == 1'b0) begin
offset_alignment <= 1'b0;
end else begin
// when using external sync an offset alignment can be done only
// after all pwm counters are paused(load_config)/reseated
offset_alignment <= (load_config_s == 1'b1) ? 1'b1 :
offset_alignment &
(ext_sync_s ? 1'b1 : !pause_cnt);
end
end
assign pause_cnt = ((pwm_armed[1] |
pwm_armed[2] |
pwm_armed[3] |
pwm_armed[4] |
pwm_armed[5] |
pwm_armed[6] |
pwm_armed[7] |
pwm_armed[8] |
pwm_armed[9] |
pwm_armed[10] |
pwm_armed[11] |
pwm_armed[12] |
pwm_armed[13] |
pwm_armed[14] |
pwm_armed[15] ) ? 1'b1 : 1'b0);
genvar i;
generate
for (i = 0; i <= 15; i = i + 1) begin: pwm_cnt
if (i <= PWMS) begin
axi_pwm_gen_1 #(
.PULSE_WIDTH (PULSE_WIDTH_G[i]),
.PULSE_PERIOD (PULSE_PERIOD_G[i])
) i_axi_pwm_gen_1 (
.clk (clk),
.rstn (pwm_gen_resetn),
.pulse_width (pwm_width_s[i]),
.pulse_period (pwm_period_s[i]),
.load_config (load_config_s),
.sync (sync[i]),
.pulse (pwm[i]),
.pulse_armed (pwm_armed[i]));
always @(posedge clk) begin
if (pwm_gen_resetn == 1'b0) begin
sync[i] <= 1'b1;
end else begin
sync[i] <= (offset_cnt == pwm_offset_s[i]) ? offset_alignment : 1'b1;
end
end
end else begin
assign pwm[i] = 1'b0;
assign pwm_armed[i] = 1'b0;
end
end
endgenerate
assign pwm_0 = pwm[0];
assign pwm_1 = pwm[1];
assign pwm_2 = pwm[2];
assign pwm_3 = pwm[3];
assign pwm_4 = pwm[4];
assign pwm_5 = pwm[5];
assign pwm_6 = pwm[6];
assign pwm_7 = pwm[7];
assign pwm_8 = pwm[8];
assign pwm_9 = pwm[9];
assign pwm_10 = pwm[10];
assign pwm_11 = pwm[11];
assign pwm_12 = pwm[12];
assign pwm_13 = pwm[13];
assign pwm_14 = pwm[14];
assign pwm_15 = pwm[15];
up_axi #(
.AXI_ADDRESS_WIDTH(16)
) i_up_axi (
.up_rstn (up_rstn),
.up_clk (up_clk),
.up_axi_awvalid (s_axi_awvalid),
.up_axi_awaddr (s_axi_awaddr),
.up_axi_awready (s_axi_awready),
.up_axi_wvalid (s_axi_wvalid),
.up_axi_wdata (s_axi_wdata),
.up_axi_wstrb (s_axi_wstrb),
.up_axi_wready (s_axi_wready),
.up_axi_bvalid (s_axi_bvalid),
.up_axi_bresp (s_axi_bresp),
.up_axi_bready (s_axi_bready),
.up_axi_arvalid (s_axi_arvalid),
.up_axi_araddr (s_axi_araddr),
.up_axi_arready (s_axi_arready),
.up_axi_rvalid (s_axi_rvalid),
.up_axi_rresp (s_axi_rresp),
.up_axi_rdata (s_axi_rdata),
.up_axi_rready (s_axi_rready),
.up_wreq (up_wreq_s),
.up_waddr (up_waddr_s),
.up_wdata (up_wdata_s),
.up_wack (up_wack_s),
.up_rreq (up_rreq_s),
.up_raddr (up_raddr_s),
.up_rdata (up_rdata_s),
.up_rack (up_rack_s));
endmodule
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