Configuration Handbook - Kamami.pl

Configuring Stratix & Stratix GX DevicesFigure 11–3. Multi-Device Configuration Circuit Note (1)V CC (2) V CC (2) V CC (2)V CCGND10 kΩ 10 kΩ(3) (4)10 kΩ(3)Stratix or Stratix GX Device 2 V CCStratix or Stratix GX Device 1MSEL2MSEL1MSEL0DCLKDATA0nSTATUSCONF_DONEnCONFIGGNDMSEL2MSEL1MSEL0DCLKDATA0nSTATUSCONF_DONEnCONFIGEPC1/EPC2DCLKDATAOE (3)nCS (3) nCASCnINIT_CONF (4)EPC1/EPC2DCLKDATAnCSOEnINIT_CONF (4)N.C.nCEOnCEnCEOnCEGNDNotes to Figure 11–3:(1) When performing multi-device active serial configuration, you must generate the configuration device programmerobject file (.pof) from each project’s SOF. You can combine multiple SOFs using the Quartus II software through theDevice & Pin Option dialog box. For more information on how to create configuration and programming files, seethe Software Settings section in the Configuration Handbook, Volume 2.(2) The pull-up resistor should be connected to the same supply voltage as the configuration device.(3) The enhanced configuration devices and EPC2 devices have internal programmable pull-ups on OE and nCS. Youshould only use the internal pull-ups of the configuration device if the nSTATUS and CONF_DONE signals are pulledup to 3.3 V or 2.5 V (not 1.8 V or 1.5 V). If external pull-ups are used, they should be 10 kΩ(4) The nINIT_CONF pin is available on EPC16, EPC8, EPC4, and EPC2 devices. If nINIT_CONF is not used, nCONFIGmust be pulled to V CC through a resistor. The nINIT_CONF pin has an internal pull-up resistor that is always activein EPC16, EPC8, EPC4, and EPC2 devices. These devices do not need an external pull-up resistor on thenINIT_CONF pin.After the first Stratix or Stratix GX device completes configuration duringmulti-device configuration, its nCEO pin activates the second device’snCE pin, prompting the second device to begin configuration. Because alldevice CONF_DONE pins are tied together, all devices initialize and enteruser mode at the same time.In addition, all nSTATUS pins are tied together; thus, if any device(including the configuration devices) detects an error, configuration stopsfor the entire chain. Also, if the first configuration device does not detectCONF_DONE going high at the end of configuration, it resets the chain bypulsing its OE pin low for a few microseconds. This low pulse drives theOE pin low on the second configuration device and drives nSTATUS lowon all Stratix and Stratix GX devices, causing them to enter an error state.If the Auto-Restart Configuration on Frame Error option is turned on inthe software, the Stratix or Stratix GX device releases its nSTATUS pinsafter a reset time-out period. When the nSTATUS pins are released andpulled high, the configuration devices reconfigure the chain. If the Auto-Altera Corporation 11–11July 2005 Stratix Device Handbook, Volume 2