Configuration Handbook - Kamami.pl

Passive Serial ConfigurationFigure 7–25 shows how to configure multiple devices using cascadedEPC2 devices.Figure 7–25. Multi-Device PS Configuration Using Cascaded EPC2 DevicesVCC (1)VCC(1) VCC (1)(3) 10 kΩ10 kΩ(2)10 kΩ (3)V CCStratix II Device 2MSEL3DCLKDATA0MSEL2nSTATUSMSEL1 CONF_DONEMSEL0nCONFIGV CCStratix II Device 1MSEL3DCLKDATA0MSEL2nSTATUSMSEL1 CONF_DONEMSEL0nCONFIGEPC2/EPC1Device 1DCLKDATAOE (3)nCS (3) nCASCnINIT_CONF (2)EPC2/EPC1Device 2DCLKDATAnCSOEnINIT_CONFGNDN.C.nCEOnCEnCEOnCEGNDGNDNotes to Figure 7–25:(1) The pull-up resistor should be connected to the same supply voltage as the configuration device.(2) The nINIT_CONF pin (available on enhanced configuration devices and EPC2 devices only) has an internal pull-upresistor that is always active, meaning an external pull-up resistor should not be used on thenINIT_CONF-nCONFIG line. The nINIT_CONF pin does not need to be connected if its functionality is not used.(3) The enhanced configuration devices’ and EPC2 devices’ OE and nCS pins have internal programmable pull-upresistors. External 10-kΩ pull-up resistors should be used. To turn off the internal pull-up resistors, check theDisable nCS and OE pull-ups on configuration device option when generating programming files.When using enhanced configuration devices or EPC2 devices, nCONFIGof the device can be connected to nINIT_CONF of the configurationdevice, allowing the INIT_CONF JTAG instruction to initiate deviceconfiguration. The nINIT_CONF pin does not need to be connected if itsfunctionality is not used. An internal pull-up resistor on the nINIT_CONFpin is always active in the enhanced configuration devices and the EPC2devices, which means that you shouldn’t be using an external pull-upresistor if nCONFIG is tied to nINIT_CONF. If you are using multipleEPC2 devices to configure a Stratix II or Stratix II GX device(s), only thefirst EPC2 has its nINIT_CONF pin tied to the device’s nCONFIG pin.You can use a single configuration chain to configure Stratix II orStratix II GX devices with other Altera devices. To ensure that all devicesin the chain complete configuration at the same time or that an errorflagged by one device initiates reconfiguration in all devices, all of thedevice CONF_DONE and nSTATUS pins must be tied together.7–66 Altera CorporationStratix II Device Handbook, Volume 2 May 2007