give the 9-bit microoperation field for the following micro- operations: a. AC←AC + 1,    DR←DR + 1 b. PC←PC + 1,    DR←M[AR] c. DR←AC,          AC←DR

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give the 9-bit microoperation field for the following micro- operations:

a. AC←AC + 1,    DR←DR + 1

b. PC←PC + 1,    DR←M[AR]

c. DR←AC,          AC←DR 

 

 
TABLE 7-1 Symbols and Binary Code for Microinstruction Fields
F1
Microoperation
Symbol
00
None
NOP
ADD
CLRAC
001
AC-AC + DR
010
AC+0
11
AC+AC + 1
INCAC
100
AC+DR
AR -DR(0–10)
DRTAC
101
DRTAR
110
AR -PC
PCTAR
111
M[AR]-DR
WRITE
F2
Microoperation
Symbol
000
None
NOP
001
AC+AC - DR
SUB
AC+AC V DR
AC+AC A DR
DRM[AR]
DR +AC
010
OR
AND
READ
АCTDR
011
100
101
110
DR +DR + 1
INCDR
111
DR(0-10) – PC
РCTDR
F3
Microoperation
Symbol
000
None
NOP
AC+ACO DR
AC+AC
001
XOR
010
COM
11
AC+shl AC
SHL
100
AC+shr AC
SHR
! 101
110
111
РC- РC + 1
INCPC
PC+AR
ARTPC
Reserved
CD
Condition
Symbol
Comments
00
Always = 1
DR(15)
AC(15)
U
Unconditional branch
01
I
Indirect address bit
Sign bit of AC
Zero value in AC
10
11
AC = 0
BR
Symbol
Function
00
JMP
CAR +AD if condition = 1
CAR +CAR + 1 if condition = 0
CAR +AD, SBR +CAR + 1 if condition = 1
CAR +CAR + 1 if condition = 0
CAR +SBR (Return from subroutine)
CAR(2-5) -DR(11-14), CAR(0,1,6) –0
01
CALL
10
RET
11
МАР
Transcribed Image Text:TABLE 7-1 Symbols and Binary Code for Microinstruction Fields F1 Microoperation Symbol 00 None NOP ADD CLRAC 001 AC-AC + DR 010 AC+0 11 AC+AC + 1 INCAC 100 AC+DR AR -DR(0–10) DRTAC 101 DRTAR 110 AR -PC PCTAR 111 M[AR]-DR WRITE F2 Microoperation Symbol 000 None NOP 001 AC+AC - DR SUB AC+AC V DR AC+AC A DR DRM[AR] DR +AC 010 OR AND READ АCTDR 011 100 101 110 DR +DR + 1 INCDR 111 DR(0-10) – PC РCTDR F3 Microoperation Symbol 000 None NOP AC+ACO DR AC+AC 001 XOR 010 COM 11 AC+shl AC SHL 100 AC+shr AC SHR ! 101 110 111 РC- РC + 1 INCPC PC+AR ARTPC Reserved CD Condition Symbol Comments 00 Always = 1 DR(15) AC(15) U Unconditional branch 01 I Indirect address bit Sign bit of AC Zero value in AC 10 11 AC = 0 BR Symbol Function 00 JMP CAR +AD if condition = 1 CAR +CAR + 1 if condition = 0 CAR +AD, SBR +CAR + 1 if condition = 1 CAR +CAR + 1 if condition = 0 CAR +SBR (Return from subroutine) CAR(2-5) -DR(11-14), CAR(0,1,6) –0 01 CALL 10 RET 11 МАР
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