ATT3000

The CMOS ATT3000 Series Field-Programmable Gate Array (FPGA) family provides a group of highdensity, digital integrated circuits. Their regular, extendable, flexible, user-programmable array architecture is composed of a configuration program store plus three types of configurable elements: a perimeter of I/O blocks, a core array of logic blocks, and resources for interconnection. The general structure of an FPGA is shown in Figure 1.

The ORCA Foundry for ATT3000 Development System provides automatic place and route of netlists. Logic and timing simulation are available as design verification alternatives.

The ATT3000 design editor is used for interactive design optimization and to compile the data pattern that represents the configuration program. The FPGA's user-logic functions and interconnections are determined by the configuration program data stored in internal static memory cells. The program can be loaded in any of several modes to accommodate various system requirements. The program data resides externally in an EEPROM, EPROM, or ROM on the application circuit board, or on a floppy disk or hard disk. On-chip initialization logic provides for optional automatic loading of program data at powerup. A serial configuration PROM can provide a very simple serial configuration program storage.