Configuration Handbook - Kamami.pl

Passive Parallel Synchronous ConfigurationFigure 7–18. Multiple-Device PPS Configuration Using a Microprocessor When Both FPGAs Receive theSame Data(1) V CC V CC (1)1 kΩ 1 kΩMemoryADDR DATA[7..0]MicroprocessorGNDAPEX 20KE orAPEX 20KC Device 1MSELOGNDAPEX 20KE orAPEX 20KC Device 2MSELOV CCV CCMSEL 1 MSEL 1CONF_DONECONF_DONEnSTATUSnSTATUSnCE nCEOnCE nCEOGNDDATA[7..0] DATA[7..0]DCLKDCLKnCONFIGnCONFIGN.C.Notes to Figure 7–18:(1) The pull-up resistor should be connected to a supply that provides an acceptable input signal for all devices in thechain.(2) The nCEO pins of both devices are left unconnected when configuring the same configuration data into multipledevices.You can use a single configuration chain to configure APEX 20KE orAPEX 20KC devices with other Altera devices that support PPSconfiguration, such as Mercury TM , ACEX ® 1K, or FLEX ® 10K devices. Toensure that all devices in the chain complete configuration at the sametime or that an error flagged by one device initiates reconfiguration in alldevices, all of the device CONF_DONE and nSTATUS pins must be tiedtogether.fFor more information on configuring multiple Altera devices in the sameconfiguration chain, refer to Configuring Mixed Altera FPGA Chains in theConfiguration Handbook.Figure 7–19 shows the timing waveform for the PPS configurationscheme using a microprocessor.7–40 Altera CorporationConfiguration Handbook, Volume 1 August 2005