Chapter 4: Storing State with the Flip-Flop

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The focus here is on the Flip-Flop, a critical element in digital circuits for storing and managing state information. The chapter explains its role and importance in FPGA designs.

A flip-flop stores state in the form of a high or low voltage, corresponding to a binary 1 or 0 or a true/false value. It does this by periodically checking the value on its input, passing that value along to its output, and holding it there.

A diagram of a D flip-flop

Flip-flops are the main component in an FPGA that is used to keep the state inside of the chip. They are memory devices that can hold 1-bit of a state variable. The output of a flip-flop, typically named Q, represents the state of the flip-flop.

There are basically four main types of latches and flip-flops: SR, D, JK, and T. The major differences in these flip-flop types are the number of inputs they have and how they change state.

XC1765EVI

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Xilinx SO8
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XC4013XL-1PQ240I

Manufacturer:Xilinx
FPGA XC4000X Family 13K Gates 1368 Cells 0.35um Technology 3.3V 240-Pin PQFP
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Lifecycle:Obsolete -

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XC4013XL-2HT144C

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FPGA XC4000X Family 13K Gates 1368 Cells 0.35um Technology 3.3V 144-Pin HSTQFP EP
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XC4013XL-2PQ160C

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FPGA XC4000X Family 13K Gates 1368 Cells 0.35um Technology 3.3V 160-Pin PQFP EP
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XC1765XJC

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Xilinx PLCC20
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