Configuration Handbook - Kamami.pl

Configuration Featuresthan 00X0 (MSEL[1] = X, “don't care”), VCCSEL=GND selects the higherI/O bank 3 POR trip point for 2.5-V/3.3-V signaling and VCCSEL=VCCPDselects the lower I/O bank 3 POR trip point associated with 1.5-V/1.8-Vsignaling.For all configuration modes with MSEL[3..0] not equal to 00X0(MSEL[1] = X, “don't care”), if VCCIO of configuration bank 3 is poweredby 1.8-V or 1.5-V and VCCSEL = GND, the voltage supplied to this I/Obank(s) may never reach the POR trip point, which prevents the devicefrom beginning configuration.If the VCCIO of I/O bank 3 is powered by 1.5- or 1.8-V and theconfiguration signals used require 3.3- or 2.5-V signaling, you should setVCCSEL to VCCPD to enable the 1.8-/1.5-V input buffers for configuration.The 1.8-V/1.5-V input buffers are 3.3-V tolerant.1 The fast passive parallel (FPP) and passive serial (PS) modesalways enable bank 3 to use the POR trip point to be consistentwith 1.8- and 1.5-V signaling, regardless of the VCCSEL setting.Table 7–6 shows how you should set VCCSEL depending on theconfiguration mode, the voltage level on VCCIO3 pins that power bank 3,and the supported configuration input voltages.Table 7–6. Supported V CCSEL Setting Based on Mode, VCCIO3, and InputConfiguration VoltageConfigurationModeV CCIO (Bank 3)Supported ConfigurationInput VoltagesV CCSELAll modes 3.3-V/2.5-V 3.3-V/2.5-V GNDAll modes 1.8-V/1.5-V 3.3-V/2.5-V V CCPD (1)All modes 1.8-V/1.5-V 1.8-V/1.5-V V CCPD— 3.3-V/2.5-V 1.8-V/1.5-V Not SupportedNote to Table 7–6:(1) The VCCSEL pin can also be connected to GND for PS (MSEL[3..0]=0010) andFPP (MSEL[3..0]=0000) modes.7–12 Altera CorporationStratix II Device Handbook, Volume 2 May 2007