Design advantages using logic cell arrays

Considers some of the design advantages which can accrue from using field programmable ASICs rather than standard parts. These advantages are illustrated by the description of a typical system design based on the logic cell array, which is a field programmable semi-custom device. The CMOS LCA is unique, in programmable logic array terms, in that the configuration is controlled by the contents of an on-chip static memory. It should be noted that although the capacity of the LCA is usually quoted in terms of equivalent gates (up to 9000) the logic is actually realised in terms of look-up tables. The LCA is based on an array of Configurable Logic Blocks (CLBs) and Input/Output Blocks (IOBs)