HW/SW Co-design Lecture 3: Lab 1 – Getting Started with the Tools Course material designed by Professor Yarsun Hsu, EE Dept, NTHU RA: Yi-Chiun Fang, EE Dept, NTHU

Outline Hardware Configuration Software Configuration

HARDWARE CONFIGURATION

Build FPGA Bitstream (1/3) Obtain the GRLIB package herehere Used version: grlib-gpl b3188.tar.gz Put the file under your home directory Start Cygwin tar zxf grlib-gpl b3188.tar.gz cd grlib-gpl b3188/designs/leon3-gr- xc3s-1500/ make distclean

Build FPGA Bitstream (2/3) make xconfig (under grlib-gpl b3188/designs/leon3-gr-xc3s-1500/ ) A GUI-based Design Configuration tool will pop up We can use this tool to set up the basic configuration of our co-designed system VHDL Debugging → Turn on “Accelerated UART Tracing” Processor → Debug Support Unit → Turn off “Instruction trace buffer” & “AHB trace buffer” Debug Link → MSB 16 bits of IP address = 0A00 Debug Link → LSB 16 bits of IP address = 000A Save and Exit

Build FPGA Bitstream (3/3) make ise | tee ise_log (under grlib-gpl b3188/designs/leon3-gr-xc3s-1500/ ) Cygwin will call ISE for HDL synthesis and generate the corresponding bitstream file You can view the file “ise_log” for the output information of the whole process for further details The process may last from 40min to longer than an hour depending on your machine and the hardware design

Configure FPGA (1/5) Turn on the GR-XC3S-1500 Dev. Board Open Xilinx iMPACT Choose “create a new project (.ipf)”

Configure FPGA (2/5) Choose “Configure devices using Boundary-Scan (JTAG)”

Configure FPGA (3/5) Choose “Bypass” for devices xcf04s & xcf01s Choose grlib-gpl b3188/designs/leon3-gr-xc3s- 1500/leon3mp.bit in your Cygwin home directory for device xc3s1500

Configure FPGA (4/5) Right click on the xc3s1500 icon, and then choose “Program” Press “OK”

Configure FPGA (5/5) Wait for the programming to finish Try again if it fails

SOFTWARE CONFIGURATION

1-D IDCT A DCT is a Fourier- related transform similar to the discrete Fourier transform (DFT), but using only real numbers We use Chen’s algorithm [*] for our 8- point IDCT design [*] W. H. Chen, C. H. Smith, and S. C. Fralick, “A fast computational algorithm for the discrete cosine transform,” IEEE Trans. Commun., Vol. COM-25, pp , Sept

2-D IDCT 2-D IDCT is a separable transform, thus it can be computed by two passes of 1-D IDCT First, compute row-wise 1-D IDCT on the block Then, compute column-wise 1-D IDCT on the 1-D row-transformed data Let X be the input 8×8 block, Y be the transformed block, we have

Lab SW: IDCT Testbench (1/2) The IDCT testbench will perform 2000 iterations of DCT & IDCT In each iteration, the program will first generate a 8x8 block of type short with pixel value ranging from -255 to 256, transform the block via sw_dct_2d(), and then transform the block back via sw_idct_2d() & hw_idct_2d() Error will be calculated by comparing the two results of IDCT In this lab, sw_idct_2d() and hw_idct_2d() are exactly the same, so the resulting error will be 0

Lab SW: IDCT Testbench (2/2) sw_idct_2d() uses a static array of type short as transpose memory /* row transform */ for (ptr = tmem, row = 0; row < 8; row++) { sw_idct_1d(ptr++, block+(row<<3), MODE_ROW); } /* column transform */ for (ptr = block, row = 0; row < 8; row++) { sw_idct_1d(ptr++, tmem+(row<<3), MODE_COL); }

Build SW Application The source code can be obtained from lab_pkg/lab1/sw Modify the path for ECOSDIR in Makefile for your environment This is the path where the eCos library is built Under lab_pkg/lab1/sw, type “ make ” to build the application properly (generating idct.elf ) -D_VERBOSE_ flag in Makefile is for more detailed testbench information You can remove it for cleaner output information

GRMON (1/3) Under the directory where you built your IDCT testbench application, type “ grmon- eval -u -eth -ip ” -u: Debug mode will enable both reading and writing to the UART from the monitor console -eth: Connect using ethernet Try resetting the board if GRMON fails to connect to your FPGA Press the RESET button

GRMON (2/3) You can use “ info sys ” to check for system configuration and memory mapping

GRMON (3/3) Type “ load./idct.elf ” to load the program just built Type “ run ” to run the program after loading The results can be seen from the monitor Press CTRL+c to exit the program