Configuration Handbook - Kamami.pl

Configuration SchemesFigure 11–6. Multi-Device PS Configuration with a Download CableV CCV CC (1)10 kΩ (2)V CC (1)10 kΩGNDV CCStratix orStratix GX Device 1MSEL0MSEL1MSEL2nCEDATA0nCONFIGCONF_DONEnSTATUSDCLKnCEOStratix orStratix GX Device 2CONF_DONEMSEL0 nSTATUSMSEL1 DCLKMSEL210 kΩV CC (1)V CC (1)10 kΩV CC (1)(2) 10 kΩDownload Cable10-Pin Male Header(PS Mode)Pin 1V CCGNDVIO (3)GNDGNDnCEnCEON.C.DATA0nCONFIGNotes to Figure 11–6:(1) You should connect the pull-up resistor to the same supply voltage as the MasterBlaster (VIO pin) or ByteBlasterMVcable.(2) The pull-up resistors on the DATA0 and DCLK pins are only needed if the download cable is the only configurationscheme used on the board. This is to ensure that the DATA0 and DCLK pins are not left floating after configuration.For example, if the design also uses a configuration device, the pull-up resistors on the DATA0 and DCLK pins arenot necessary.(3) V IO is a reference voltage for the MasterBlaster output driver. V IO should match the device’s V CCIO . See theMasterBlaster Serial/USB Communications Cable Data Sheet for this value.If you are using a download cable to configure device(s) on a board thatalso has configuration devices, you should electrically isolate theconfiguration devices from the target device(s) and cable. One way toisolate the configuration devices is to add logic, such as a multiplexer, thatcan select between the configuration devices and the cable. Themultiplexer device should allow bidirectional transfers on the nSTATUSand CONF_DONE signals. Another option is to add switches to the fivecommon signals (CONF_DONE, nSTATUS, DCLK, nCONFIG, and DATA0)between the cable and the configuration devices. The last option is toremove the configuration devices from the board when configuring withthe cable. Figure 11–7 shows a combination of a configuration device anda download cable to configure a Stratix or Stratix GX device.11–16 Altera CorporationStratix Device Handbook, Volume 2 July 2005