Atmel 4-Mbit memories aim for SoCs, large FPGAs

Martin Mason, Atmel's FPGA product-marketing manager, noted that all SRAM-based FPGAs derive their functionality from binary configuration data that is read into them on power-up from external nonvolatile memory.

"Serial-configuration E2-PROMs are popular for bit stream storage because they can be programmed in system and contain all of the logic required to program SRAM-based devices," he said. "As FPGA densities have increased to a million or more gates, the densities of configuration E2P ROMs have not kept pace, so multiple E2PROMs have been necessary, and that results in higher power consumption and board complexity."

Mason added that the problem has been compounded by the advent of programmable systems-on-chip that include a microcontroller with high-density programmable logic. "Nonvolatile storage is required for the microcontroller program code as well as the FPGA bit stream and application data," he said. The new E2PROM arrays are intended to solve the problem by providing single-chip bit stream, code and data storage for popular FPGAs and programmable system-chip devices.

The memories use a single 3.3- or 5-volt power supply for both read and write operations and contain on-chip logic to allow faster FPGA loading. Write-protect mechanisms, set by external pins, are said to allow any portion of the E2PROM array to be protected, so the rest of the array can be used for application data storage.

The AT17LV040 is guaranteed for 10,000 write cycles and data retention of at least 100 years. It should be available in the second quarter, packaged in a 44-pin thin quad flat pack and priced at $33.50 in quantities of 1,000.

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EETInfo No. 637