Configuration Handbook - Kamami.pl

Configuring Cyclone II DevicesFigure 13–20. Multiple Device PS Configuration Using a USB-Blaster, MasterBlaster, ByteBlaster II orByteBlasterMV CableV CC (1)V CC (1)10 kΩV CC (1) (2)V CC (1)10 kΩUSB-Blaster, ByteBlaster II,MasterBlaster, or ByteBlasterMV10-Pin Male Header(Passive Serial Mode)10 kΩ10 kΩ(2)V CC (1)V CC (4)GNDV CC10 kΩCyclone II FPGA 1CONF_DONEnSTATUSMSEL0DCLKMSEL1nCEDATA0nCEOnCONFIG10 kΩPin 1GNDV CC (2)GNDVIO (3)V CCCyclone II FPGA 2MSEL0MSEL1CONF_DONEnSTATUSDCLKGNDnCEnCEON.C. (5)DATA0nCONFIGNotes to Figure 13–20:(1) The pull-up resistor should be connected to the same supply voltage as the USB-Blaster, MasterBlaster (VIO pin),ByteBlaster II, or ByteBlasterMV cable.(2) The pull-up resistors on DATA0 and DCLK are only needed if the download cable is the only configuration schemeused on your board. This is to ensure that DATA0 and DCLK are not left floating after configuration. For example, ifyou are also using a configuration device, the pull-up resistors on DATA0 and DCLK are not needed.(3) Pin 6 of the header is a V IO reference voltage for the MasterBlaster output driver. V IO should match the device'sV CCIO . Refer to the MasterBlaster Serial/USB Communications Cable Data Sheet for this value. In theByteBlasterMV, this pin is a no connect. In the USB-Blaster and ByteBlaster II, this pin is connected to nCE when itis used for AS programming, otherwise it is a no connect.(4) Connect the pull-up resistor to the V CCIO supply voltage of I/O bank that the nCEO pin resides in.(5) The nCEO pin of the last device in chain can be left unconnected or used as a user I/O pin.If you are using a download cable to configure Cyclone II devices on aPCB that also has configuration devices, you should electrically isolatethe configuration devices from the target Cyclone II devices and cable.One way to isolate the configuration device is to add logic, such as amultiplexer, that can select between the configuration device and thecable. The multiplexer should allow bidirectional transfers on thenSTATUS and CONF_DONE signals. Additionally, you can add switches toAltera Corporation 13–51February 2007 Cyclone II Device Handbook, Volume 1