MAS2909CB datasheet(6/13 Pages) ETC1

Numer części	MAS2909CB

Szczegółowy opis	RADIATION HARD MICROPROGRAM SEQUENCER

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MA2909/11

J + 1

I(J + 1)

I(J)

J + 2

JSR A

I(J + 1)

J + 3

I(A)

JSR A

A + 1

J + 3

A + 1

I(A + 1)

I(A)

A + 2

J + 3

A + 2

JSR B

I(A + 1)

A + 3

J + 3

RTS

JRS B

B + 1

A + 3

J + 3

A+ 3

I(A + 3)

RTS

A + 4

J + 3

A + 4

RTS

I(A + 3)

A + 5

J + 3

I(J + 3)

RTS

S1, S0

PUP

µPC

STK0

STK1

STK2

STK3

(Y)

µWR

Address

J - 1

J + 1

J + 2

J + 3

A + 1

A + 2

A + 3

A + 4

CONTROL MEMORY

J + 4

I(J + 4)

I(J + 3)

Table 4: Two Nested Subroutines

Microprogram

Sequencer

Instruction

JSR A

JSR B

RTS

Execute

Cycle

Execute Cycle

2909 inputs

(from µWR)

Internal

Registers

2909 Output

ROM Output

Contents of µWR

(instruction

being executed)

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