3. The błock diagram of a simple example Computer with microprogrammed contro! (presented on lecturers 8 and 9) is shown in Figurę 2.1. The microinstruction format for the control memory is shown in Figurę 2.2. Symbols and binary codę for microinstruction fields are listed in Figurę 2.3. Example microporograms are shown in Figurę 2.4.
MUX
10
10
AR
address
memory 2048x 16
PC
MUX
6 0 6 0
15
Ł
SBR
CAR
DR
control memory
ALSU
control unit
15
V.
AC
Fig. 2.1. The błock diagram of a simple example Computer with microprogrammed control.
3 3 3 2 2 7
FI |
F2 |
F3 |
CD |
BR |
AD |
FI, F2, F3: microoperation field CD: condition for branching BR. branch field AD; address field
Figurę 2.2. Microinstruction codę format.