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XUM Bootloader version 1.01 Readme
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----------------------------------
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Contents:
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---------
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README - This file
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programmer/ - A C# Windows application for interfacing with a XUM device
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win32_installer/ - A binary installer
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win32_source/ - Visual Studio 2010 source project
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Programmer Description:
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-----------------------
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Implements programming software to interface with a XUM device over the
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XUM boot protocol. This specific implementation is based on C# for a
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Windows 32-bit environment. Sorry.
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The Verilog hardware files are not included here because this version
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is released with the full XUM hardware files.
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XUM Boot Protocol Description:
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------------------------------
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1. Programmer sends 'XUM' ASCII bytes.
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2. Programmer sends a number indicating how many 32-bit data words it
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has to send, minus 1. (For example, if it has one 32-bit data word,
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this number will be 0.) The size of this number is 18 bits.
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This means the minimum transmission size is 1 word (32 bits), and
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the maximum transmission size is 262144 words (exactly 1MB).
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This 18-bit number is sent in three bytes from high-order bits to
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low-order bits, and the six most significant bits of the first
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byte must be 0.
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3. The FPGA sends back the third size byte from the programmer, allowing
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the programmer to determine if the FPGA is listening and conforming
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to the XUM boot protocol.
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4. The programmer sends another 18-bit number indicating the starting
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offset in memory where the data should be placed. Normally this will
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be 0. This number is also sent in three bytes, and the six most
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significant bits of the first byte are ignored.
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5. The programmer sends the data. A copy of each byte that it sends will
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be sent back to the programmer from the FPGA, allowing the programmer
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to determine if all the data was transmitted successfully.
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