ALTERA DOES NOT WARRANT THAT THE FUNCTIONS CONTAINED IN THIS PATCH WILL MEET YOUR REQUIREMENTS, OR THAT THE OPERATION OF THIS PATCH WILL BE UNINTERRUPTED OR ERROR-FREE. //**************************************************************** readme_patch_8.0_0.22.txt Readme file for Quartus II 8.0 Patch 0.22 Copyright (C) Altera Corporation 2008 All right reserved. Patch created on July 03 2008 Patch SPR#: 277599 SPRs fixed: 277299 //**************************************************************** Problem: Quartus II 8.0 software enables an internal resistor between 2 dedicated differential IO pair when each IO is used as single end IO and the input or output termination in the IO is set to "series 25 ohms without calibration" or "series 50 ohms without calibration". This resistor has an effect on the IO when it is set to a 3.3V and it makes the IO Voltage in the complementary pin to drop to 2.3v or more. This problem only appears on Stratix III devices. Solution: This patch fixes the problem. The internal resistor will not be enabled when the IO is set to "series 25 ohms without calibration" or "series 50 ohms without calibration". Caution - You must either have previously installed the Quartus II software version 8.0 or must install the Quartus II software version 8.0 before installing this patch. Otherwise, the patch will not be installed correctly and the Quartus II software will not run properly.