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/rtl/System09_Xess_XuLA/System09_XuLA_Readme_Important.txt
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System09 XuLA port |
================== |
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This is a port of the System09 project to the XESS 200Kgate Spartan3A XuLA board. |
It uses 1MB of the SDRAM. Only half the data bus is used. |
System09 XuLA port was implemented with Xilinx ISE Design Suite 12.4 |
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Check XuLA.ucf for the pin assignment. |
It uses a MAX3232 for the RS232 interface, PS/2 keyboard interface and 3 bit RGB VGA video output. |
Video format is 80 characters x 25 character with 8 horizontal pixels per character |
The design doubles the 12MHz crystal on the XuLA board for the pixel clock |
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Care must be taken with the Spartan3A inputs when connecting to 5V outputs |
as the inputs are normally not diode clamped. |
The UCF file specified PCI inputs on the input pin which should be diode clamped |
but only after the Spartan3A FPGA on the XuLA board is configured. |
Series current limiting resistors should be used when connecting a 5V logic output to an FPGA input. |
Check the UCF file to determine which inputs are diode clamped. |
Series limitted 5V logic outputs should not be connected to Spartan3A inputs until it is configured |
as a PCI33 input. |
|
John Kent |
2011-10-09 |
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The System09 XuLA port is licenced under GNU GPL version 3. |
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-- Copyright (C) 2011 John Kent |
-- |
-- This program is free software: you can redistribute it and/or modify |
-- it under the terms of the GNU General Public License as published by |
-- the Free Software Foundation, either version 3 of the License, or |
-- (at your option) any later version. |
-- |
-- This program is distributed in the hope that it will be useful, |
-- but WITHOUT ANY WARRANTY; without even the implied warranty of |
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
-- GNU General Public License for more details. |
-- |
-- You should have received a copy of the GNU General Public License |
-- along with this program. If not, see <http://www.gnu.org/licenses/>. |
-- |