This project aims to implement RTL components for DVB-S2, initially focusing on the transmission side.
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Functional block diagram of the DVB-S2 System from ETSI EN 302 307-1 V1.4.1 |
- Behaviour should match exactly what GNU Radio produces for every combination of
parameters described on the DVB-S2 base spec (no extensions yet). This means
components should handle
- Frame types: Normal and short
- Constellations: 8 PSK, 16 APSK and 32 APSK
- Code rates: 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/10,
- Components should also handle parameters changing on every frame, that is, they should handle frame with config A then a frame with config B immediately afterwards without requiring reset or wait cycles
- Use AXI-Stream interfaces
Component name | Simulation | HW testing |
---|---|---|
Baseband scrambler | ✔ | ✔ |
BCH encoder | ✔ | ✔ |
Bit interleaver | ✔ | ✔ |
Constellation mapper | ✔ | ✔ |
LDPC Encoder | ✔ | ✔ |
Physical layer framing | ✔ | ✔ |
The dvb_fpga/rtl/dvbs2_encoder.vhd
top level has been run through Vivado targeting a xczu4cg-sfvc784-1LV-i
and
with a clock frequency of 300 MHz (both arbitrary). No timing issues were
reported and the resource usage post implementation is show below. Table below
assumes default values for generics, i.e., POLYPHASE_FILTER_NUMBER_TAPS
=
33
, POLYPHASE_FILTER_RATE_CHANGE
= 2
and DATA_WIDTH
= 32
.
Component | LUTs | FFs | RAMB | DSPs |
---|---|---|---|---|
axi_baseband_scrambler | 277 | 46 | 0 | 0 |
axi_bch_encoder | 1397 | 1380 | 0 | 0 |
axi_ldpc_encoder | 1017 | 558 | 6 | 0 |
axi_bit_interleaver | 339 | 262 | 10 | 0 |
axi_constellation_mapper | 599 | 253 | 0 | 0 |
axi_physical_layer_framer | 280 | 268 | 0 | 0 |
+ axi_physical_layer_header | 13 | 100 | 0 | 0 |
+ axi_physical_layer_scrambler | 39 | 70 | 0 | 0 |
+ dummy_frame_generator | 48 | 21 | 0 | 0 |
polyphase_filter_i/q | 162 | 2168 | 0 | 64 |
Register map | 586 | 318 | 0 | 0 |
Debug infrastructure | 374 | 581 | 0 | 0 |
Others | 1470 | 283 | 4 | 0 |
TOTAL | ~6.5k | ~6.1k | 20 | 64 |
For details on what the "Others" row includes, see the DVB-S2 Tx top level block diagram in the wiki.
Tests can be run locally or on a Docker container. Running locally will require GNU Radio, VUnit and a VHDL simulator.
Uses the same container used for CI
# Clone this repo and submodules
git clone --recurse-submodules https://github.com/phase4ground/dvb_fpga
cd dvb_fpga
# Run the tests
./misc/run_tests.sh
Arguments passed to docker/run_tests.sh
will be passed to run.py
and, by
extension, to VUnit (no environment variable is passed on though). This will
generate gnuradio_data (test data).
- Requirements
- GNU Radio
- A VHDL simulator
- VUnit
# Install VUnit
pip install vunit-hdl
# Clone this repo and submodules
git clone --recurse-submodules https://github.com/phase4ground/dvb_fpga
cd dvb_fpga
# Run the tests
./run.py
The first invocation of run.py
will run GNURadio and create stimulus files.
To list tests use ./run.py -l
:
$ ./run.py -l
lib.axi_bit_interleaver_tb.data_width=8,all_parameters.back_to_back
lib.axi_bit_interleaver_tb.data_width=8,all_parameters.slow_master
lib.axi_bit_interleaver_tb.data_width=8,all_parameters.slow_slave
lib.axi_bit_interleaver_tb.data_width=8,all_parameters.both_slow
lib.axi_ldpc_table_tb.test_all_configs.back_to_back
lib.axi_ldpc_table_tb.test_all_configs.slow_master
lib.axi_ldpc_table_tb.test_all_configs.slow_slave
lib.axi_ldpc_table_tb.test_all_configs.slow_master,slow_slave
lib.axi_bch_encoder_tb.test_all_configs.back_to_back
lib.axi_bch_encoder_tb.test_all_configs.slow_master
lib.axi_bch_encoder_tb.test_all_configs.slow_slave
lib.axi_bch_encoder_tb.test_all_configs.both_slow
lib.dvbs2_encoder_tb.test_all_configs.back_to_back
lib.axi_ldpc_encoder_core_tb.test_all_configs.back_to_back
lib.axi_ldpc_encoder_core_tb.test_all_configs.data=0.5,table=1.0,slave=1.0
lib.axi_ldpc_encoder_core_tb.test_all_configs.data=1.0,table=1.0,slave=0.5
lib.axi_ldpc_encoder_core_tb.test_all_configs.data=0.75,table=1.0,slave=0.75
lib.axi_ldpc_encoder_core_tb.test_all_configs.data=1.0,table=0.5,slave=1.0
lib.axi_ldpc_encoder_core_tb.test_all_configs.data=1.0,table=0.75,slave=0.75
lib.axi_ldpc_encoder_core_tb.test_all_configs.data=0.8,table=0.8,slave=0.8
lib.axi_baseband_scrambler_tb.test_all_configs.back_to_back
lib.axi_baseband_scrambler_tb.test_all_configs.slow_master
lib.axi_baseband_scrambler_tb.test_all_configs.slow_slave
lib.axi_baseband_scrambler_tb.test_all_configs.both_slow
Listed 24 tests
Scripts are provided as an example to get things going, currently this has not been tested in real hardware.
./misc/run_synth.sh
vivado -source ./build/vivado/build.tcl