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MA2909 Datasheet, PDF (6/13 Pages) List of Unclassifed Manufacturers – RADIATION HARD MICROPROGRAM SEQUENCER
◁
MA2909/11
Execute Cycle
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
2909 inputs
(from µWR)
Internal
Registers
2909 Output
ROM Output
Contents of µWR
(instruction
being executed)
S1, S0
FE
PUP
D
µPC
STK0
STK1
STK2
STK3
Y
(Y)
µWR
0
H
X
X
J+1
-
-
-
-
J+1
I(J + 1)
0
H
X
X
J+2
-
-
-
-
J+2
JSR A
3
L
H
A
J+3
-
-
-
-
A
I(A)
0
H
X
X
A+1
J+3
-
-
-
A+1
I(A + 1)
0
H
X
X
A+2
J+3
-
-
-
A+2
JSR B
2
L
L
X
A+3
J+3
-
-
-
B
RTS
0
H
X
X
B+1
A+3
J+3
-
-
A+ 3
I(A + 3)
0
H
X
X
A+4
J+3
-
-
-
A+4
RTS
2
L
L
X
A+5
J+3
-
-
-
J+3
I(J + 3)
0
H
X
X
J+4
-
-
-
-
J+4
I(J + 4)
I(J) I(J + 1) JSR A I(A) I(A + 1) JRS B RTS I(A + 3) RTS I(J + 3)
Table 4: Two Nested Subroutines
CONTROL MEMORY
Microprogram
Execute
Cycle Address
Sequencer
Instruction
J-1
-
T0
J
-
T1
J+1
-
T2
J+2
JSR A
T9
J+3
-
-
-
-
-
-
-
-
-
T3
A
-
T4
A+1
-
T5
A+2
JSR B
T7
A+3
-
T8
A+4
RTS
-
-
-
-
-
-
-
-
T6
B
-
RTS
-
6
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