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diff --git a/zpu/hdl/index.html b/zpu/hdl/index.html new file mode 100644 index 0000000..d3b4c1a --- /dev/null +++ b/zpu/hdl/index.html @@ -0,0 +1,47 @@ +<html> +<body> +<h1>Getting started - FPGA </h1> +The simplest version of the ZPU uses BRAM. When getting accustomed to the ZPU, a BRAM ZPU with a UART +is a good place to start. +<p> +You'll find a working simulation script in hdl/example/simzpu.do. +<p> +When implementing the ZPU, copy the following files and modify them to your needs: +<ol> + <li>hdl/example/zpu_config.vhd - set up RAM size here + <li>hdl/example/helloworld.vhd - dual port BRAM implementation. +</ol> +Obviously you must also connect the ZPU to the rest of your IO subsystem. IO is memory mapped(read/write) in the ZPU. +<h2>Generating VHDL BRAM initialization </h2> + +<code> +../install/bin/zpu-elf-objdump -O binary hello.elf hello.bin<br> +java -classpath ../simulator/zpusim.jar com.zylin.zpu.simulator.tools.MakeRam hello.bin >hello.bram<br> + +</code> +<h2>Running example simulation</h2> +The hdl/example directory has a simulation written for Xilinx WebPack ModelSim. From the ModelSim command prompt: +<ol> +<li>cd c:/<installfolder>/hdl/example +<li>do zpusim.do +</ol> +<p> +After running the hello world simulation (see zpusim.do), two files are written to the hdl/exmaple directory: +<ol> +<li>log.txt - contains the "Hello world!" text written to the debug channel/simplified UART. +<li>trace.txt - a trace file for the CPU. The instruction set simulator has the capability of taking +this file as input in order to verify that the HDL implementation matches the instruction set simulator. +When a mismatch is found, the GDB debugger will break. Very handy for debugging custom ZPU implementations. +</ol> +<h2>HDL Directories & files </h2> +<ul> +<li>example - contains example files & working ZPU. Start here. +<li>wishbone - contains wishbone interface for the ZPU +<li>zpu3 - if you are interested in developing ZPU cores and not only using them, then this directory contains various stuff of more or less historical interest. +<li>zpu4 - if you are interested in developing ZPU cores and not only using them, then this is the active development version. You'll also want to copy out the +files you need from this folder to your own project. +</ul> + +The HDL files need a bit of spit and polish! +</body> +</html> |
