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axi_fifo2dac: Initial commit 

BRAM fifo for high speed DACs
main
Istvan Csomortani 2015-04-07 17:46:36 +03:00
parent de2c3764d6
commit 9fa3131858
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270
library/axi_fifo2dac/axi_fifo2dac.v Normal file
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// ***************************************************************************
// ***************************************************************************
// Copyright 2015(c) Analog Devices, Inc.
//
// 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 Analog Devices, Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
// - The use of this software may or may not infringe the patent rights
// of one or more patent holders. This license does not release you
// from the requirement that you obtain separate licenses from these
// patent holders to use this software.
// - Use of the software either in source or binary form, must be run
// on or directly connected to an Analog Devices Inc. component.
//
// THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED.
//
// IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY
// RIGHTS, 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.
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
`timescale 1ns/100ps
module axi_fifo2dac (
// clock signals
dac_clk,
dac_rst,
// transfer request from DMAC
xfer_req,
// fifo IN interface/channel
data_in_0,
dvalid_in_0,
data_in_1,
dvalid_in_1,
data_in_2,
dvalid_in_2,
data_in_3,
dvalid_in_3,
data_in_4,
dvalid_in_4,
data_in_5,
dvalid_in_5,
data_in_6,
dvalid_in_6,
data_in_7,
dvalid_in_7,
// fifo OUT interface/channel
dvalid_out_0,
data_out_0,
dvalid_out_1,
data_out_1,
dvalid_out_2,
data_out_2,
dvalid_out_3,
data_out_3,
dvalid_out_4,
data_out_4,
dvalid_out_5,
data_out_5,
dvalid_out_6,
data_out_6,
dvalid_out_7,
data_out_7
);
// parameters
parameter CH_DW = 16;
parameter FIFO_AW = 10;
localparam FIFO_DW = 8 * CH_DW;
// port definitions
input dac_clk;
input dac_rst;
input xfer_req;
input [(CH_DW-1):0] data_in_0;
input dvalid_in_0;
input [(CH_DW-1):0] data_in_1;
input dvalid_in_1;
input [(CH_DW-1):0] data_in_2;
input dvalid_in_2;
input [(CH_DW-1):0] data_in_3;
input dvalid_in_3;
input [(CH_DW-1):0] data_in_4;
input dvalid_in_4;
input [(CH_DW-1):0] data_in_5;
input dvalid_in_5;
input [(CH_DW-1):0] data_in_6;
input dvalid_in_6;
input [(CH_DW-1):0] data_in_7;
input dvalid_in_7;
input dvalid_out_0;
output [(CH_DW-1):0] data_out_0;
input dvalid_out_1;
output [(CH_DW-1):0] data_out_1;
input dvalid_out_2;
output [(CH_DW-1):0] data_out_2;
input dvalid_out_3;
output [(CH_DW-1):0] data_out_3;
input dvalid_out_4;
output [(CH_DW-1):0] data_out_4;
input dvalid_out_5;
output [(CH_DW-1):0] data_out_5;
input dvalid_out_6;
output [(CH_DW-1):0] data_out_6;
input dvalid_out_7;
output [(CH_DW-1):0] data_out_7;
// internal signals
wire [(FIFO_DW-1):0] data_in_s;
wire [(FIFO_DW-1):0] data_out_s;
wire dvalid_in_s;
wire dvalid_out_s;
wire fifo_wren_s;
// internal registers
reg [ 2:0] dac_xfer_req_m = 'b0;
reg dac_xfer_init = 'b0;
reg dac_xfer_enable = 'b0;
reg dac_xfer_enable_d = 'b0;
reg dac_read_init = 'b0;
reg dac_read_enable = 'b0;
reg [(FIFO_AW-1):0] dac_waddr = 'b0;
reg [(FIFO_AW-1):0] dac_waddr_d = 'b0;
reg [(FIFO_AW-1):0] dac_raddr = 'b0;
reg [(FIFO_AW-1):0] dac_maxaddr = 'b0;
reg [(FIFO_DW-1):0] data_in = 'b0;
reg [(FIFO_DW-1):0] data_in_d = 'b0;
reg dvalid_in = 1'b0;
reg dvalid_in_d = 1'b0;
// internal logic
assign data_in_s = {data_in_7, data_in_6, data_in_5, data_in_4,
data_in_3, data_in_2, data_in_1, data_in_0};
assign dvalid_in_s = dvalid_in_0 | dvalid_in_1 | dvalid_in_2 | dvalid_in_3 |
dvalid_in_4 | dvalid_in_5 | dvalid_in_6 | dvalid_in_7;
assign dac_waddr_limit_s = &dac_waddr_d;
// write interface
always @(posedge dac_clk) begin
if(dac_rst == 1'b1) begin
dac_xfer_req_m <= 3'b0;
dac_xfer_init <= 1'b0;
dac_xfer_enable <= 1'b0;
end else begin
dac_xfer_req_m <= {dac_xfer_req_m[1:0], xfer_req};
dac_xfer_init <= ~dac_xfer_req_m[2] & dac_xfer_req_m[1];
if(dac_xfer_init == 1'b1) begin
dac_xfer_enable <= 1'b1;
end else if ((dac_waddr_limit_s == 1'b1) || (dac_xfer_req_m[2] == 1'b0)) begin
dac_xfer_enable <= 1'b0;
end
end
end
always @(posedge dac_clk) begin
if(dac_rst == 1'b1) begin
dac_waddr <= 'h0;
dac_waddr_d <= 'h0;
dac_maxaddr <= {FIFO_AW{1'b1}};
end if(dvalid_in_d == 1'b1) begin
dac_waddr <= (dac_xfer_enable == 1'b1) ? (dac_waddr + 1) : 'h0;
dac_waddr_d <= dac_waddr;
end
if((dac_xfer_enable == 1'b0) && (dac_xfer_enable_d == 1'b1)) begin
dac_maxaddr <= dac_waddr_d;
end
end
// pipelines
always @(posedge dac_clk) begin
if(dac_rst == 1'b1) begin
data_in <= 'b0;
data_in_d <= 'b0;
dvalid_in <= 1'b0;
dvalid_in_d <= 1'b0;
dac_xfer_enable_d <= 1'b0;
end else begin
data_in <= data_in_s;
data_in_d <= data_in;
dvalid_in <= dvalid_in_s;
dvalid_in_d <= dvalid_in;
dac_xfer_enable_d <= dac_xfer_enable;
end
end
assign fifo_wren_s = dvalid_in_d & dac_xfer_enable;
// read interface
assign dvalid_out_s = dvalid_out_0 | dvalid_out_1 | dvalid_out_2 | dvalid_out_3 |
dvalid_out_4 | dvalid_out_5 | dvalid_out_6 | dvalid_out_7;
always @(posedge dac_clk) begin
if(dac_rst == 1'b1) begin
dac_raddr <= 'b0;
end else begin
if(dvalid_out_s == 1'b1) begin
dac_raddr <= (dac_raddr < dac_maxaddr) ? (dac_raddr + 'b1) : 'b0;
end
end
end
// output logic
assign data_out_0 = data_out_s[(1*CH_DW-1): 0];
assign data_out_1 = data_out_s[(2*CH_DW-1):(1*CH_DW)];
assign data_out_2 = data_out_s[(3*CH_DW-1):(2*CH_DW)];
assign data_out_3 = data_out_s[(4*CH_DW-1):(3*CH_DW)];
assign data_out_4 = data_out_s[(5*CH_DW-1):(4*CH_DW)];
assign data_out_5 = data_out_s[(6*CH_DW-1):(5*CH_DW)];
assign data_out_6 = data_out_s[(7*CH_DW-1):(6*CH_DW)];
assign data_out_7 = data_out_s[(8*CH_DW-1):(7*CH_DW)];
// memory instantiation
ad_mem #(
.ADDR_WIDTH (FIFO_AW),
.DATA_WIDTH (FIFO_DW))
i_mem_fifo (
.clka (dac_clk),
.wea (fifo_wren_s),
.addra (dac_waddr),
.dina (data_in_d),
.clkb (dac_clk),
.addrb (dac_raddr),
.doutb (data_out_s));
endmodule

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library/axi_fifo2dac/axi_fifo2dac_ip.tcl Normal file
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# ip
source ../scripts/adi_env.tcl
source $ad_hdl_dir/library/scripts/adi_ip.tcl
adi_ip_create axi_fifo2dac
adi_ip_files axi_fifo2dac [list \
"$ad_hdl_dir/library/common/ad_mem.v" \
"axi_fifo2dac.v" ]
adi_ip_properties_lite axi_fifo2dac
ipx::save_core [ipx::current_core]