Configuration Handbook - Kamami.pl

Dynamic Configuration (Page Mode) Implementation OverviewFigure 3–3. Example of Using Debugging Switches for Control LinesPLDDCLKDATA0nSTATUSCONF_DONEnCONFIGDCLKDATA0OEnCSConfigurationDevicenINIT_CONFPORSELPLDDCLKDATA0nSTATUSCONF_DONEnCONFIGPGM[2..0]DATA1DynamicConfiguration(Page Mode)ImplementationOverviewPages in enhanced configuration devices allow you to organize and storevarious configurations for entire systems that use one or more AlteraPLDs. This dynamic configuration (or page mode) feature allows systemsto dynamically reconfigure their PLDs with different configuration files.You can use different pages to store configuration files that supportdifferent standards (for example, I/O standards, memory). Alternatively,the different pages can place the system in different modes. For instance,page 0 could contain a configuration file (.sof) for the PLD that onlyprocesses data packets; page 1 could contain a configuration file for thesame PLD that processes data and voice packets.With the ability to dynamically switch pages, you can also configureAltera devices with various revisions for debugging without having toreprogram the configuration device. For example, you can configure adevice that is on “stand-by” to perform another function and thenreconfigure it back with the original configuration file.A page is a section of the flash memory space that contains configurationdata for all PLDs in the system. One page stores one system configurationregardless of the number of PLDs in the system. The size of each page isdynamic and can change each time the enhanced configuration device isreprogrammed. Enhanced configuration devices support a maximum ofeight pages of configuration data, or eight system configurations. Thenumber of pages is also limited to the density of the configuration device.3–6 Altera CorporationConfiguration Handbook, Volume 2 April 2007