![]() Ck1 is now used to shift right the digits in registers R 1 and R 2, thus presenting the next most significant pair of digits at terminals A and B. With M = 1, Ck2 is disabled and Ck1 is enabled. The corresponding sum and carry-out appear at the output terminals of the full adder. With M = 0, Ck2 is enabled, the flip-flop is cleared, and the registers are loaded with the two numbers to be added so that the two least significant bits are available at terminals A and B. ![]() ![]() The selection of either of the two clock pulses is a function of the mode control M (see Figure 12.12). ![]() The basic element of the circuit is a full adder which is operated in conjunction with a DFF and a pair of shift registers which have parallel loading and shift right facilities controlled by Ck1 and Ck2. Read more Navigate DownĪ serial adder uses a sequential technique and may be regarded as a very simple finite state machine. Compare delay and size with a 2-bit carry-ripple adder implemented with (radix-2) full-adders (use average delays). 2.3ĭesign a radix-4 full adder using the CMOS family of gates shown in Table 2.4. L load on the gate output * different characteristics for each input + XNOR same characteristics as XOR for full-adder characteristics see Table 2.2 2.2ĭetermine the delay of a 32-bit adder using the full-adder characteristics of Table 2.4 (average delays). ![]()
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