Programmable Logic


Industry first FPGA has unique hardened latches for aerospace uses

14 March 2001 Programmable Logic

Actel is offering the first member of its radiation-tolerant RTSX-S family, the RT54SX32S. The RTSX-S family ranges in density from 32 000 to 72 000 typical gates and offers system performance in excess of 250 MHz. The Actel RTSX-S family is built on a foundation of hardened latches, which obviate the need for triple module redundancy (TMR). Traditional FPGAs, which do not use hardened latches, force the user to implement TMR using software or a large portion of the FPGA's programmable logic. This inefficient process of majority voting, or redundancy, means that two-thirds of the density or available logic, is consumed for redundancy and is not available for the user's design. By including hardened latches, designers can use all available density in RTSX-S devices. Applications for the RTSX-S family include those in radiation-intensive environments, such as space probes and satellites.

As a result of Actel consultations with customers including NASA's Goddard Space Flight Center, the company modified and optimised its architecture to meet the stringent aerospace requirements including added capability in the I/O modules and the device core sequential logic.

The I/O module specifications of the RTSX-S family include increased noise margins, decreased power and improved compatibility with other microcircuits and, most importantly, provision for control of the I/O signals during the power-on and power-off transients. In addition to the unprecedented levels of radiation tolerance the FPGA family has a high degree of interface flexibility. For example, the RTSX-S devices support 2,5, 3,3 and 5 V input signals, with configurable I/O support for 3,3 and 5 V PCI, LVTTTL and TTL levels in any combination. It also supports the 33 MHz, 32-bit PCI bus.

Actel is represented in South Africa by ASIC Design Services. For further information contact Kobus van Rooyen, (011) 315 8316, [email protected]



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