Был случай не с замыканием а с ошибкой в даташите из закотрой сгорел циклон за 80$
В даташите на EPCS стр 10 написано (возможно в новой версси это исправили -не проверял)
Цитата
Notes to Figure 7:
(1) VCC = 3.3 V.
(2) In AS mode, the first Cyclone device in the chain is the master device. The other Cyclone devices in the chain are
slave devices and must be in passive serial (PS) configuration mode.
(3) Serial configuration devices cannot be cascaded.
(4) Set MSEL0 to 0 and MSEL1 to 0 to select AS mode in the Cyclone device.
(5) Set MSEL0 to 0 and MSEL1 to 1 to select PS mode in the Cyclone device.
в AN250 MSEL0 на 1 а MSEL1 на 0.
ошибка в даташите на EPCS