Configuration Handbook - Kamami.pl

Passive Serial ConfigurationYou can use a single configuration chain to configure APEX 20KE andAPEX 20KC 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.fFor more information on configuring multiple Altera devices in the sameconfiguration chain, refer to the Configuring Mixed Altera FPGA Chains inthe Configuration Handbook.Figure 7–12 shows the timing waveform for the PS configuration forAPEX 20KE and APEX 20KC devices using a microprocessor.Figure 7–12. APEX 20KE & APEX 20KC PS Configuration Using a Microprocessor Timing Waveformt CFGt CF2ST1nCONFIGt CF2CKt STATUSnSTATUS (1)CONF_DONE (2)DCLKt CF2CDt CF2ST0t CLKt CH t CLt DH(3)t ST2CKHigh-ZDATAUser I/OBit 0 Bit 1 Bit 2 Bit 3 Bit nt DSU(3)User ModeINIT_DONEt CD2UMNotes to Figure 7–12:(1) Upon power-up, the APEX 20KE or APEX 20KC device holds nSTATUS low for not more than 5 µs after V CC reachesits minimum requirement.(2) Upon power-up, before and during configuration, CONF_DONE is low.(3) DATA0 and DCLK should not be left floating after configuration. It should be driven high or low, whichever is moreconvenient.7–26 Altera CorporationConfiguration Handbook, Volume 1 August 2005