Q7Digital Electronics
Question
4 marks
Explain CPLDs.
Answer
CPLDs (Complex Programmable Logic Devices) are PLDs with multiple PAL-like blocks connected by a programmable interconnect matrix, offering higher capacity than simple PLDs.
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- Non-volatile configuration: EEPROM or Flash-based; retains programming after power off
- Predictable timing: fixed interconnect delay (unlike FPGA's variable routing delay)
- Instantaneous power-on: no configuration loading time
- Capacity: hundreds to thousands of equivalent gates
- Used for glue logic, state machines, bus interfaces, and power-on configuration of FPGAs
- Examples: Xilinx XC9500, Altera MAX 7000, Lattice ispMACH