Using Table 5.6, derive the label the control gates for the increment inputs in

Question

Using Table 5.6, derive the label the control gates for the increment inputs in PC register of the basic computer:

Complete the boolean expression for INC(PC)

INC(PC)=

TABLE 5-6 Control Functions and Microoperations for the Basic Computer AR PC Fetch R'To MIARI, PC -PC 1 RIT IR R'Ta: Do, D, Decode IR(12-14), Decode DIT: AR MUARI Indirect Interrupt RTO AR+0, TR+PC RTI MIAR] TR, PC 0 RT PC+PC+ 1, IEN 0, R 0, SC Memory-reference: DoT DR -MIAR] AND DOTs: AC ACA DR, SC -0 DIT DR -MUARI ADD DIT. AC-AC DR E-Con, SC-0 D.T.: DR -MIAR] LDA DT AC-DR, SC --0 MIAR) AC, SC 0 D, T STA. BUN D.Ti PC-AR, SC 0 DST. MIAR] PC, AR AR 1 BSA DSTs PC-AR, SC 0 DoT DR MIAR] ISZ, DLT. DR DR 1 DeT: MARI DR if(DR 0) then (PC PC 1, SC 00 Register-reference: D, r (common to all register-reference instructions) IR(i) B. (i 0, 1, 2, 11) SC -0 rBal: AC-0 E 4-0 rB, AC AC rB. E E rB, CIR B,: AC shr AC, AC(15) E, E AC(0) Be: AC shl AC, AC(0) E, E AC(15) INC rB, AC AC 1 rB4: If (AC(15) 0) then (PC-PC 1) SPA. SNA rBs: If (AC(15) 1) then (PC PC 1) rB2: If (AC-0) then PC PC 1) rBI: If (E 0) then (PC PC 1) HLT rBo S-0 Input-output: DhIT, p (common to all input-output instructions) IR(i) B (i 6, 7, 8, 9, 10, 11) SC -0 INP pBII: AC(0-7) INPR, FGI-0 OUT pBhoi OUTR AC(0-7) FGO p B,: If (FGI 1) then (PC-PC 1) SKU pBs: If (FGO 1) then (PC PC 1) SKO ION PB IEN PB.: IEN 4-0 IOF Table source Computer System Architecture morris mano Third Edition

Explanation / Answer

we need to assume few that ZDR = 1 if DR = 0; ZAC = 1, if AC = 0

lets do this

INR (PC) = R'T1 + RT2 + D6T6Z DR + PB9(FGI) + PB8(FGO) +rB4(AC15)' + rB3(AC15) + rB2ZAC + rB1E'LD (PC) = D4T4 + D5T5
CLR (PC) = RT1
thing to light on: there are AND gates infront of OR gates that is connected to INR pin

hence the output is shown above

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