Configuration Handbook - Kamami.pl

Configuring Stratix III DevicesTable 11–15. Dedicated Configuration Pins on the Stratix III Device (Part 5 of 7)Pin Name User Mode ConfigurationSchemePin TypeDescriptionCONF_DONE N/A All Bidirectionalopen-drainStatus output. The target device drives theCONF_DONE pin low before and duringconfiguration. Once all configuration data isreceived without error and the initializationcycle starts, the target device releasesCONF_DONE.Status input. After all data is received andCONF_DONE goes high, the target deviceinitializes and enters user mode. TheCONF_DONE pin must have an external 10-kΩpull-up resistor in order for the device toinitialize.Driving CONF_DONE low after configurationand initialization does not affect the configureddevice.The enhanced configuration devices' OE andnCS pins have optional internalprogrammable pull-up resistors. If you useinternal pull-up resistors on the enhancedconfiguration device, you should not useexternal 10-kΩ pull-up resistors on these pins.nCE N/A All Input Active-low chip enable. The nCE pin activatesthe device with a low signal to allowconfiguration. The nCE pin must be held lowduring configuration, initialization, and usermode. In single device configuration, it shouldbe tied low. In multi-device configuration, nCEof the first device is tied low while its nCEO pinis connected to nCE of the next device in thechain.The nCE pin must also be held low forsuccessful JTAG programming of the device.nCEO N/A All Output Output that drives low when deviceconfiguration is complete. In single deviceconfiguration, this pin is left floating. Inmulti-device configuration, this pin feeds thenext device's nCE pin. The nCEO of the lastdevice in the chain is left floating.The nCEO pin is powered by V CCPGM .Altera Corporation 11–79May 2007 Stratix III Device Handbook, Volume 1