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1 в факе альтеры читаем
Problem
What affect does X-ray radiation have on ALTERA devices?
Solution
For general testing purposes, inspecting printed circuit boards (PCBs) with X-rays will not harm Altera devices. This applies to SRAM-, EPROM-, EEPROM-, and Flash-based devices. For example, an X-ray inspection of solder connections on a PCB with a ball-grid array (BGA) package will not damage the Altera device.
Altera has performed internal studies concerning x-ray radiation and results indicate that units introduced to x-rays of 100KV and 75 KV were functionally good up to 105 roentgen of exposure. Typical exposure level during x-ray inspection is < 1000 Roentgen.
тоесть как бы утверждается что альтера работает таким образом что не содержит RAM конфигурирования
с другой стороны
в Application Note 357
читаем
Stratix and Cyclone series have built-in error detection circuitry to detect
data corruption by soft errors. Soft errors are the changes in the state of a
configuration SRAM bit due to colliding alpha or neutron particle. When
the data bit is re-written with the correct value by reconfiguring the
device, the device functions correctly. This error detection capability
continuously computes the CRC of the configured SRAM bits and
compares it with the pre-calculated CRC. If the CRCs match, there is no
error in the current configuration SRAM bits. The process of error
detection continues until the device is reset (by pulling nCONFIG low).
тоесть конфигурация считается находится в RAM
но проверка этой RAM делается только при конфигурации
тогда возникает вопрос А ПОЧЕМУ ПОТОМ В РАБОТЕ эта RAM уже не RAM и вней не может возникнуть ошибок от радиации?
кто может прокоментировать это или объяснить
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