Configuration Handbook - Kamami.pl

Configuration Devices for SRAM-Based LUT Devices Data SheetWhen configuring Stratix series, Cyclone series, APEX II, APEX 20K,Mercury, ACEX 1K, and FLEX 10K devices with cascaded EPC2 or EPC1devices, the position of the EPC2 or EPC1 device in the chain determinesits mode of operation. The first configuration device in the chain is themaster, while subsequent configuration devices are slaves. ThenINIT_CONF pin of the master EPC2 device can be connected to thenCONFIG of the FPGAs, which allows the INIT_CONF JTAG instructionto initiate FPGA configuration. The nCS pin of the master configurationdevice is connected to the CONF_DONE of the FPGA(s), while its nCASCpin is connected to nCS of the next slave configuration device in the chain.Additional EPC2 or EPC1 devices can be chained together by connectingnCASC to nCS of the next slave EPC2 or EPC1 device in the chain. The lastdevice’s nCS input comes from the previous device, while its nCASC pinis left floating. All other configuration pins (DCLK, DATA, and OE) areconnected to every device in the chain.Figure 5–3 shows the basic configuration interface connections between aconfiguration device chain and the Altera FPGA.fFor specific details on configuration interface connections, includingpull-up resistor values, supply voltages and MSEL pin setting, refer tothe appropriate FPGA family chapter in the Configuration Handbook.Altera Corporation 5–9April 2007 Configuration Handbook, Volume 2