MA2910 Datasheet, PDF(3/16 Page) List of Unclassifed Manufacturers

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MA2910 Datasheet, PDF (3/16 Pages) List of Unclassifed Manufacturers – RADIATION HARD MICROPROGRAM CONTROLLER

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MA2910

Y (0 to 11) (Microcode address)

This is a 12 bit wide tristate output bus. It carries the

microcode address generated according to the instruction

read in from the I bus. OE can be used to put the bus in a high

impedance state. This allows another to take control of the

microcode address bus.

OE (Output enable)

This active low input is used to enable the 12 lines of the Y

bus.

CP (Clock Pulse)

A LOW-to-HlGH transition on this input is used to trigger all

state changes within the device.

FULL (stack full)

The active low output FULL indicates that 9 items have

been loaded onto the stack .

PL, MAP & VECT (pipeline, map and vector)

These active low outputs are set according to the

instruction being executed. At any time only one is active.

They may be used to select from one of three possible

external sources for microprogramme jumps, being used

directly as three-state enables for these sources.

Typically: PL enables the primary source of

microprogramme jumps, usually part of a pipeline register;

MAP enables a PROM which maps an instruction to a

microcode starting location; VECT enables an optional third

source, after a vector from DMA or interrupt source.

I3 - I0 MNEMONIC NAME

FAIL CCEN =

/CONTROL HIGH

Y STACK

PASS CCEN =

HIGH & CC =

LOW

Y STACK

CONTROL

ENABLE

0 JZ

1 CJS

2 JMAP

3 CJP

4 PUSH

5 JSRP

6 CJV

7 JRP

8 RFCT

9 RPCT

10 CRTN

11 CJPP

12 LDCT

13 LOOP

14 CONT

15 TWB

JUMP ZERO

COND JS P PL

JUMP MAP

COND JUMP PL

PUSH/COND LD

CNTR

COND JSB R/PL

VECTOR

COND JUMP

COND JUMP R/PL

REPEAT LOOP

CNTR â 0 .

REPEAT PL,

CNTR â 0

COND RTN

COND JUMP PL

& POP

LD CNTR &

CONTINUE

TEST END LOOP

CONTINUE

THREE-WAY

BRANCH

CLEAR

X PC HOLD

X D HOLD

X PC HOLD

X PC PUSH

X R PUSH

X PC HOLD

X R HOLD

â 0 F HOLD

= 0 PC POP

â 0 D HOLD

= 0 PC HOLD

X PC HOLD

X F HOLD

X PC HOLD

â 0 F HOLD

= 0 D PO P

O CLEAR

D PUSH

D HOLD

PC PUSH

D PUSH

D HOLD

F HOLD

PC POP

D HOLD

PC HOLD

F POP

D POP

PC HOLD

PC POP

PC HOLD

PC POP

Note 1: If CCEN = LOW & CC = HIGH, hold, else load.

Figure 2: Table of Instructions

HOLD

Note 1

MAP

HOLD

DEC

HOLD

DEC

HOLD

VECT

LOAD

HOLD

DEC

HOLD

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