Configuration Handbook - Kamami.pl

Active Serial Configuration (Serial Configuration Devices)Figure 7–12. Single Device AS ConfigurationV CC (1) V CC (1) V CC (1)10 kΩ10 kΩ10 kΩSerial ConfigurationDeviceStratix II or Stratix II GX FPGAnSTATUSCONF_DONE nCEOnCONFIGnCEN.C.DATADCLKnCSASDI(2)GNDDATA0DCLKnCSOASDO(3) MSEL3(3) MSEL2(3) MSEL1(3) MSEL0V CCGNDNotes to Figure 7–12:(1) Connect the pull-up resistors to a 3.3-V supply.(2) Stratix II and Stratix II GX devices use the ASDO to ASDI path to control theconfiguration device.(3) If using an EPCS4 device, MSEL[3..0] should be set to 1101. Refer to Table 7–11for more details.Upon power-up, the Stratix II and Stratix II GX devices go through aPOR. The POR delay is dependent on the PORSEL pin setting. WhenPORSEL is driven low, the POR time is approximately 100 ms. If PORSELis driven high, the POR time is approximately 12 ms. During POR, thedevice will reset, hold nSTATUS and CONF_DONE low, and tri-state alluser I/O pins. Once the device successfully exits POR, all user I/O pinscontinue to be tri-stated. If nIO_pullup is driven low during power-upand configuration, the user I/O pins and dual-purpose I/O pins willhave weak pull-up resistors which are on (after POR) before and duringconfiguration. If nIO_pullup is driven high, the weak pull-up resistorsare disabled.fThe value of the weak pull-up resistors on the I/O pins that are on beforeand during configuration can be found in the DC & SwitchingCharacteristics chapter of the Stratix II Device Handbook and theStratix II GX Device Handbook.The configuration cycle consists of three stages: reset, configuration andinitialization. While nCONFIG or nSTATUS are low, the device is in reset.After POR, the Stratix II and Stratix II GX devices release nSTATUS,which is pulled high by an external 10-kΩ pull-up resistor, and entersconfiguration mode.7–36 Altera CorporationStratix II Device Handbook, Volume 2 May 2007