What role do interconnect resources play in a CPLD ?
They provide the routing for signals between logic elements.
A CPLD (Complex Programmable Logic Device) is made of several PAL-like function blocks (macrocells), I/O blocks and a programmable interconnect array that links them.
The interconnect resources form a global switch matrix: they route signals from input pins and from macrocell outputs to the inputs of other function blocks, so that logic implemented in different blocks can be connected into a complete design.
Power is supplied through the device's supply pins, communication with other chips is handled through I/O, and configuration is stored in the EEPROM/flash cells of the device — not in the interconnect.
Hence, the answer is They provide the routing for signals between logic elements.
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