CPLD design hints for Atmel-Synario

What are CPLDs?
A complex programmable logic device (CPLD) is a programmable logic device with complexity between that of PALs and FPGAs, and architectural features of both. It is made up of several simple PLDs (SPLDs) with a programmable switching matrix in between the logic blocks. CPLDs typically use EEPROM, flash memory or SRAM to hold the logic design interconnections.

What are PLDs?
PLDs or programmable logic devices refer to a variety of logic chips that are programmable at the user's site. Programmability of logic means that new chip designs can be tested and easily changed without incurring the huge photomask costs for chips completed in a fab. In addition, memory-based PLDs can be reprogrammed over and over, which allows working products to be upgraded at the user's site.