Quaternary Logic Lookup Table in Standard CMOS

• The proposed 2-input 1-output QLUT is shown in Fig. 2. For this given QLUT complexity, 16 quaternary configuration inputs are necessary, one for each possible combination of the two quaternary inputs. The configuration word defines the reconfigurable quaternary function. In practice, the input signals are used to select which one of the configuration inputs is connected to the output. The proposed QLUT is composed of two main blocks: a 16-1 multiplexer using an array of switches, that establishes a low-resistance path between one configuration input and the output according to the input values; and a quaternary-to-binary decoder, consisting of a 2-bit analog-to-digital (ADC) frontend followed by combinational logic used to generate the control signals feeding the multiplexer.

Advantages:

• Less Hardware complexity
• More power consumption

Software used:                                                           

• Modelsim
• Xilinx 14.2
• DSCH3 & MICROWIND