a3load is 8051 firmware that can be used for uploading or downloading
to EZ-USB RAM (internal or external).  It implements the vendor specific
command bRequest = 0xA3.  The address to download/upload to/from is 
specified in the wValue field of the SETUP packet and the length of
the transfer in the wLength field.  The actual upload/download data
is transferred during the DATA stage of the SETUP transfer.  This firmware
will function on all EZ-USB chips (EZ-USB, EZ-USB FX, FX2, FX2LP, FX1).
