library:util_pad: Initial version

Data to DMA/system memory must be presented in widths of multiple of 8 bits,
however this padding is not optimal if is done in the transport layer
since this will affect the DAC/ADC FIFO or offload storage.

This utility block adds or removes padding from sample stream in case the
sample with is not multiple of 8 bits, and can be placed between the DMA
and FIFO/Offload blocks.
main
Laszlo Nagy 2021-03-03 11:51:16 +00:00 committed by Laszlo Nagy
parent cb8cf4b3d2
commit 36d0a8b3e8
4 changed files with 98 additions and 0 deletions

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@ -116,6 +116,7 @@ clean:
$(MAKE) -C util_mfifo clean $(MAKE) -C util_mfifo clean
$(MAKE) -C util_pack/util_cpack2 clean $(MAKE) -C util_pack/util_cpack2 clean
$(MAKE) -C util_pack/util_upack2 clean $(MAKE) -C util_pack/util_upack2 clean
$(MAKE) -C util_pad clean
$(MAKE) -C util_pulse_gen clean $(MAKE) -C util_pulse_gen clean
$(MAKE) -C util_rfifo clean $(MAKE) -C util_rfifo clean
$(MAKE) -C util_sigma_delta_spi clean $(MAKE) -C util_sigma_delta_spi clean
@ -239,6 +240,7 @@ lib:
$(MAKE) -C util_mfifo $(MAKE) -C util_mfifo
$(MAKE) -C util_pack/util_cpack2 $(MAKE) -C util_pack/util_cpack2
$(MAKE) -C util_pack/util_upack2 $(MAKE) -C util_pack/util_upack2
$(MAKE) -C util_pad
$(MAKE) -C util_pulse_gen $(MAKE) -C util_pulse_gen
$(MAKE) -C util_rfifo $(MAKE) -C util_rfifo
$(MAKE) -C util_sigma_delta_spi $(MAKE) -C util_sigma_delta_spi

13
library/util_pad/Makefile Normal file
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@ -0,0 +1,13 @@
####################################################################################
## Copyright (c) 2018 - 2021 Analog Devices, Inc.
### SPDX short identifier: BSD-1-Clause
## Auto-generated, do not modify!
####################################################################################
LIBRARY_NAME := util_pad
GENERIC_DEPS += util_pad.v
XILINX_DEPS += util_pad_ip.tcl
include ../scripts/library.mk

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@ -0,0 +1,71 @@
// ***************************************************************************
// ***************************************************************************
// Copyright 2018 (c) Analog Devices, Inc. All rights reserved.
//
// Each core or library found in this collection may have its own licensing terms.
// The user should keep this in in mind while exploring these cores.
//
// Redistribution and use in source and binary forms,
// with or without modification of this file, are permitted under the terms of either
// (at the option of the user):
//
// 1. The GNU General Public License version 2 as published by the
// Free Software Foundation, which can be found in the top level directory, or at:
// https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
//
// OR
//
// 2. An ADI specific BSD license as noted in the top level directory, or on-line at:
// https://github.com/analogdevicesinc/hdl/blob/dev/LICENSE
//
// ***************************************************************************
// ***************************************************************************
`timescale 1ns/100ps
module util_pad #(
parameter NUM_OF_SAMPLES = 2,
parameter IN_BITS_PER_SAMPLE = 16,
parameter OUT_BITS_PER_SAMPLE = 16,
parameter PADDING_TO_MSB_LSB_N = 0,
parameter SIGN_EXTEND = 1
) (
input [NUM_OF_SAMPLES*IN_BITS_PER_SAMPLE-1:0] data_in,
output reg [NUM_OF_SAMPLES*OUT_BITS_PER_SAMPLE-1:0] data_out
);
// Remove padding
if (IN_BITS_PER_SAMPLE >= OUT_BITS_PER_SAMPLE) begin
integer i;
always @(*) begin
for (i=0;i<NUM_OF_SAMPLES;i=i+1) begin
if (PADDING_TO_MSB_LSB_N==1) begin
data_out[i*OUT_BITS_PER_SAMPLE +: OUT_BITS_PER_SAMPLE] =
data_in[i*IN_BITS_PER_SAMPLE +: OUT_BITS_PER_SAMPLE];
end else begin
data_out[i*OUT_BITS_PER_SAMPLE +: OUT_BITS_PER_SAMPLE] =
data_in[((i+1)*IN_BITS_PER_SAMPLE)-1 -: OUT_BITS_PER_SAMPLE];
end
end
end
end
// Add padding
if (IN_BITS_PER_SAMPLE < OUT_BITS_PER_SAMPLE) begin
integer i;
always @(*) begin
for (i=0;i<NUM_OF_SAMPLES;i=i+1) begin
if (PADDING_TO_MSB_LSB_N==1) begin
data_out[i*OUT_BITS_PER_SAMPLE +: OUT_BITS_PER_SAMPLE] =
{{OUT_BITS_PER_SAMPLE-IN_BITS_PER_SAMPLE{data_in[(i+1)*IN_BITS_PER_SAMPLE-1]&SIGN_EXTEND[0]}},
data_in[i*IN_BITS_PER_SAMPLE +: OUT_BITS_PER_SAMPLE]};
end else begin
data_out[i*OUT_BITS_PER_SAMPLE +: OUT_BITS_PER_SAMPLE] =
{data_in[((i+1)*IN_BITS_PER_SAMPLE)-1 -: OUT_BITS_PER_SAMPLE],
{OUT_BITS_PER_SAMPLE-IN_BITS_PER_SAMPLE{1'b0}}};
end
end
end
end
endmodule

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@ -0,0 +1,12 @@
# ip
source ../scripts/adi_env.tcl
source $ad_hdl_dir/library/scripts/adi_ip_xilinx.tcl
adi_ip_create util_pad
adi_ip_files util_pad [list \
"util_pad.v" ]
adi_ip_properties_lite util_pad
ipx::save_core [ipx::current_core]