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4 bit binary Adder introduction:-
Binary adders are implemented to add two binary numbers. So in order to add two 4 bit binary numbers we need to use 4 full-adders. The connection of full-adders to create bianry adder circuit is discussed in block diagram below.
In this implementation, carry of each full-adder is connected to previous carry. Detailed discussion on full-adder is covered on this link.
Lets discuss one example for 4 bit binary Adder. In this example we will use some terms from Register Transfer Level (RTL) implementations.
Q. Add two binary numbers 7 and 15 with previous carry = 0.
Sol. Load the values in two registers R1 and R2.
So, R1 = 7 (decimal) = 0111 (in binary A3A2A1A0)
& R2 = 15 (decimal) = 1111 (in binary B3B2B1B0)
So from the above implementation we have -
Sum of two binary numbers 7 and 15 from above table
Is C4S3S2S1S0 = 10110 (In Binary) = 16 (decimal)
Digital design resources
Clock Domain Crossing rtl & testbench.
Rate change (asynchronous) FIFO design and fifo depth calculation.
Half-adder, Full-adder, 4-bit binary adder , adder-subtractor circuit, overflow with rtl & testbench. Binary Multiplier, Parity error TT, Arithmetic, logical, shift micro-operations. Stack organization, LIFO, RPN discussion.
RTL coding guidelines. ICG cell, Assertions, $assertkill, levels.
Digital design Interview questions.
FPGA Interview. FPGA flow.
Guide to Graduate studies in US
Pipeline vs. Parallel processing.