Question

04) [20 marks] Design a processor that can execute the following instructions: symbol Symbolic designation M[EA] MIEA]- AC If AC is -ve then PCPC +1 AC M[EA] Description in words Subtract AC from memory If memory is negative, then increment PC Load the memory word into AC SUBM SINV LDA The memory and register size are your own choice. Assume any data you want. You donot need to design ALU

Answer 1

Solution:

The processon ald be instnustod ba 16 bi instuction set Architeet 16 bt initnudia 13 IL 2 3 45 6 789 to n 12 input opend Imput opetond 3 bi(addpess) D destination addeess (3bit) 3 bit (addyess) A > F- Ореoda caлтy in (ibit) shifj arount 13 bi) 3 bit topethe EA at addpess O00 egidor egistor regits A stop the AC at addpess ao1 B 3bre h Pc at addpes до 1 A MIFA MEBA]-AC AC is-re PCPC+ 1 0 0 ACMEAT

Operation outputs Cin endions oip S2 S S0Cih iepenent addtan add mih cas ! AtB AtBt anithnetie Subslyeet mh bore Substnac A-B- A-B decpenen A A-I tremor 11 1 A vS OR OR Lugi AND NOT A LL

data file RIb R &stinain Jelect Buph Select C 2 ALU shifter 15 16 nith co Yarua bles Phocus u 3 15 2 Cin P B H (