Non-volatile look-up table for an FPGA
View Patent ↗A non-volatile-memory-transistor based lookup table for an FPGA includes a n:1 multiplexer. A non-volatile memory transistor is coupled to each of the n inputs of the multiplexer. The multiplexer has x address inputs wherein 2 x =n as is known in the art. The output of the multiplexer is coupled to V CC through a pullup transistor. The gate of the pullup transistor is coupled to the output of an address transition detector circuit that has inputs coupled to the address inputs of the multiplexer. A sense amplifier is coupled to the output of the multiplexer.
1. A non-volatile-memory-transistor based lookup table for an FPGA including:
a multiplexer having a plurality of address inputs, a plurality of data inputs, and an output;
a plurality of multiplexer input circuits, each multiplexer input coupled to a different one of the data inputs of the multiplexer and including:
a first n-channel transistor having a drain coupled to a voltage potential, a gate, and a source;
a second n-channel transistor having a drain coupled to the source of the first n-channel transistor, a gate, and a source coupled to ground;
a first non-volatile memory cell having an output coupled to the gate of the first n-channel transistor;
a second non-volatile memory cell having an output coupled to the gate of the second n-channel transistor;
n-channel transistors coupled to each of the data inputs of the multiplexer;
a sense amplifier coupled to the output of the multiplexer.
2. The non-volatile-memory-transistor based lookup table of claim 1 wherein the multiplexer has x address inputs and 2 x data inputs.
3. The non-volatile-memory-transistor based lookup table of claim 1 wherein the multiplexer has four address inputs and sixteen data inputs.
4. The non-volatile-memory-transistor based lookup table of claim 1 wherein each non-volatile memory transistor is a floating gate transistor.
5. The non-volatile-memory-transistor based lookup table of claim 1 wherein each non-volatile memory transistor is a nano-crystal transistor.
6. The non-volatile-memory-transistor based lookup table of claim 1 wherein each non-volatile memory transistor is a SONOS transistor.