Configuration Handbook - Kamami.pl

Configuring Cyclone II DevicesIf your system has multiple Cyclone II devices (in the same density andpackage) with the same configuration data, you can configure them inone configuration cycle by connecting all device’s nCE pins to ground andconnecting all the Cyclone II device’s configuration pins (nCONFIG,nSTATUS, DCLK, DATA0, and CONF_DONE) together. You can also use thenCEO pin as a user I/O pin after configuration. The configuration signalsmay require buffering to ensure signal integrity and prevent clock skewproblems. Make sure the DCLK and DATA lines are buffered for everyfourth device. All devices start and complete configuration at the sametime. Figure 13–11 shows multiple device PS configuration when bothCyclone II devices are receiving the same configuration data.Figure 13–11. Multiple Device PS Configuration When Both FPGAs Receive the Same DataADDRMemoryDATA0V CC (1)V CC (1)V CCV CC10 kΩ 10 kΩCyclone II DeviceCyclone II DeviceCONF_DONEMSEL1MSEL0CONF_DONEMSEL1MSEL0External Host(MAX II Deviceor Microprocessor)GNDnSTATUSnCEDATA0nCONFIGGNDnCEO N.C. (3)GNDnSTATUSnCEDATA0nCONFIGGNDnCEO N.C. (2)DCLKDCLKNotes to Figure 13–11:(1) The pull-up resistor should be connected to a supply that provides an acceptable input signal for all devices in thechain. V CC should be high enough to meet the V IH specification of the I/O on the devices and the external host.(2) The nCEO pins of both devices can be left unconnected or used as user I/O pins when configuring the sameconfiguration data into multiple devices.You can use a single configuration chain to configure Cyclone II deviceswith other Altera devices. Connect all the Cyclone II device’s and allother Altera device’s CONF_DONE and nSTATUS pins together so alldevices in the chain complete configuration at the same time or that anerror reported by one device initiates reconfiguration in all devices.fFor more information on configuring multiple Altera devices in the sameconfiguration chain, see Configuring Mixed Altera FPGA Chains in theConfiguration Handbook.Altera Corporation 13–29February 2007 Cyclone II Device Handbook, Volume 1