Electronic component e.g. field programmable gate array, programming and testing system, has switches to isolate bus of daughterboard from daughterboard and motherboard connection units when component control device is connected to bus

摘要

The system has a daughterboard (100) with a communication bus (B2) permitting access to electronic components. Connection units (CN3) connect the daughterboard to a motherboard (150) with communication buses. Other connection units connect the daughterboard to an electronic component control device. The daughterboard has switches (10a-10e) to isolate the bus (B2) from the units (CN3) when the device is connected to the bus (B2).