Configuration Handbook - Kamami.pl

Device Configuration PinsTable 7–22. Dedicated Configuration Pins on the Stratix II & Stratix II GX Device (Part 3 of 10)Pin NameUser ModeConfigurationSchemePin TypeDescriptionnCONFIG N/A All Input Configuration control input. Pulling this pin lowduring user-mode will cause the device to loseits configuration data, enter a reset state,tri-state all I/O pins. Returning this pin to alogic high level will initiate a reconfiguration.nSTATUS N/A All Bidirectionalopen-drainIf your configuration scheme uses anenhanced configuration device or EPC2device, nCONFIG can be tied directly to V CCor to the configuration device’s nINIT_CONFpin.The device drives nSTATUS low immediatelyafter power-up and releases it after the PORtime.Status output. If an error occurs duringconfiguration, nSTATUS is pulled low by thetarget device.Status input. If an external source drives thenSTATUS pin low during configuration orinitialization, the target device enters an errorstate.Driving nSTATUS low after configuration andinitialization does not affect the configureddevice. If a configuration device is used,driving nSTATUS low will cause theconfiguration device to attempt to configurethe device, but since the device ignorestransitions on nSTATUS in user-mode, thedevice does not reconfigure. To initiate areconfiguration, nCONFIG must be pulled low.The enhanced configuration devices’ andEPC2 devices’ OE and nCS pins have optionalinternal programmable pull-up resistors. Ifinternal pull-up resistors on the enhancedconfiguration device are used, external 10-kΩpull-up resistors should not be used on thesepins. When using EPC2 devices, only external10-kΩ pull-up resistors should be used.7–96 Altera CorporationStratix II Device Handbook, Volume 2 May 2007