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Get Started with Deep Learning FPGA Deployment on Xilinx ZCU102 SoC

This example shows how to create, compile, and deploy a dlhdl.Workflow object that has a handwritten character detection series network as the network object by using the Deep Learning HDL Toolbox™ Support Package for Xilinx FPGA and SoC. Use MATLAB® to retrieve the prediction results from the target device.


  • Xilinx ZCU102 SoC development kit.

  • Deep Learning HDL Toolbox™

  • Deep Learning HDL Toolbox™ Support Package for Xilinx FPGA and SoC

  • Deep Learning Toolbox™

Load the Pretrained Series Network

To load the pretrained series network, that has been trained on the Modified National Institue Standards of Technolofy (MNIST) database, enter:

snet = getDigitsNetwork();

To view the layers of the pretrained series network, enter:


Create Target Object

Create a target object that has a custom name for your target device and an interface to connect your target device to the host computer. Interface options are JTAG and Ethernet.

hTarget = dlhdl.Target('Xilinx','Interface','Ethernet')
hTarget = 
  Target with properties:

       Vendor: 'Xilinx'
    Interface: Ethernet
    IPAddress: ''
     Username: 'root'
         Port: 22

Create WorkFlow Object

Create an object of the dlhdl.Workflow class. Specify the network and the bitstream name during the object creation. Specify saved pretrained MNIST neural network, snet, as the network. Make sure that the bitstream name matches the data type and the FPGA board that you are targeting. In this example, the target FPGA board is the Xilinx ZCU102 SOC board and the bitstream uses a single data type.

hW = dlhdl.Workflow('network', snet, 'Bitstream', 'zcu102_single','Target',hTarget)
hW = 
  Workflow with properties:

            Network: [1×1 SeriesNetwork]
          Bitstream: 'zcu102_single'
    ProcessorConfig: []
             Target: [1×1 dlhdl.Target]

Compile the MNIST Series Network

To compile the MNIST series network, run the compile function of the dlhdl.Workflow object.

dn = hW.compile;
### Optimizing series network: Fused 'nnet.cnn.layer.BatchNormalizationLayer' into 'nnet.cnn.layer.Convolution2DLayer'
          offset_name          offset_address    allocated_space 
    _______________________    ______________    ________________

    "InputDataOffset"           "0x00000000"     "4.0 MB"        
    "OutputResultOffset"        "0x00400000"     "4.0 MB"        
    "SystemBufferOffset"        "0x00800000"     "28.0 MB"       
    "InstructionDataOffset"     "0x02400000"     "4.0 MB"        
    "ConvWeightDataOffset"      "0x02800000"     "4.0 MB"        
    "FCWeightDataOffset"        "0x02c00000"     "4.0 MB"        
    "EndOffset"                 "0x03000000"     "Total: 48.0 MB"

Program Bitstream onto FPGA and Download Network Weights

To deploy the network on the Xilinx ZCU102 SoC hardware, run the deploy function of the dlhdl.Workflow object. This function uses the output of the compile function to program the FPGA board by using the programming file. It also downloads the network weights and biases. The deploy function starts programming the FPGA device, displays progress messages, and the time it takes to deploy the network.

### FPGA bitstream programming has been skipped as the same bitstream is already loaded on the target FPGA.
### Loading weights to FC Processor.
### FC Weights loaded. Current time is 28-Jun-2020 12:37:32

Run Prediction for Example Image

To load the example image, execute the predict function of the dlhdl.Workflow object, and then display the FPGA result, enter:

inputImg = imread('five_28x28.pgm');

Run prediction with the profile 'on' to see the latency and throughput results.

[prediction, speed] = hW.predict(single(inputImg),'Profile','on');
### Finished writing input activations.
### Running single input activations.

              Deep Learning Processor Profiler Performance Results

                   LastLayerLatency(cycles)   LastLayerLatency(seconds)       FramesNum      Total Latency     Frames/s
                         -------------             -------------              ---------        ---------       ---------
Network                      73717                  0.00034                       1              73759           2982.7
    conv_module              27207                  0.00012 
        conv_1                6673                  0.00003 
        maxpool_1             4891                  0.00002 
        conv_2                4999                  0.00002 
        maxpool_2             3569                  0.00002 
        conv_3                7135                  0.00003 
    fc_module                46510                  0.00021 
        fc                   46510                  0.00021 
 * The clock frequency of the DL processor is: 220MHz
[val, idx] = max(prediction);
fprintf('The prediction result is %d\n', idx-1);
The prediction result is 5

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