In the context of an ALU, how does the carry-lookahead adder improve addition speed compared to a ripple-carry adder?
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In the context of an ALU, how does the carry-lookahead adder improve addition speed compared to a ripple-carry adder?
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- Show how the PAL-type array in Figure should be programmed to implement each of the following SOP expressions. Use an X to indicate a connected link. (a) Y = + + ABC (b) Y = + A BC +Build a 4-bit adder with inputs a (input [3:0] a;) and inputs b (input [3:0]b;) with outputs c (output reg[3:0] c;). This circuit should be mapped to switches and LEDs so that you can see the answer. This circuit should not use the "+" operator and should be implemented with full-adders. Top module = module add_4bits(input [3:0]a, input[3:0]b, output reg[3:0]c);Calculate the logical effort and parasitic delay of a one-bit ripple-carry cell adder
- An IC (number: ? ) is a parallel adder and is comprised of this number of full adders:_ . Connecting it properly with another IC (containing these gates: ? ) will increase its functionality. Set_? = 0 for subtraction.The circuit of Exp #8.2, configured as a subtractor, can be used to compare two 4-bit numbers. Subtractor outputs Cout and (S3.so) can be combined logically to indicate the relationship between inputs A and B. The gate circuit needed to do this appears as the interface block in the following diagram. Subtractor 220 ohm Cout A - B LEDO 4 A S3 A < B LED1 220 ohm Interface Block S2 (Your Design) 220 ohm B S1 A > B LED2 So (A - B) AirSupplyLab.com Figure 8.2: 4-bit Comparator Design the contents of this interface. You will build the circuit using only 2 chips: 1. a 7402 NOR chip 2. either a 7432 OR chip or a 7408 AND chip. Design the interface two ways: (a) an OR and NOR circuit, and (b), a NOR and AND circuit. Include both designs in your lab notebook and build and test one of them. Each design consists of 3 parts – one for each output – and requires 5 gates total. ExpressSCH has custom DM symbols for all gates (including ANDS and ORs). Use them, but only where they make circuit…Write the Dynamic gates using a clocked pMOS pull-up network.