MAS2910CE datasheet(3/16 Pages) ETC1

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MA2910

FAIL CCEN =

PASS CCEN =

I3 - I0

MNEMONIC

NAME

HIGH & CC =

ENABLE

/CONTROL HIGH

LOW

CONTROL

STACK

JUMP ZERO

CLEAR

HOLD

CJS

COND JS P PL

HOLD

PUSH

HOLD

JMAP

JUMP MAP

HOLD

MAP

CJP

COND JUMP PL

HOLD

PUSH

PUSH/COND LD

PUSH

Note 1

CNTR

JSRP

COND JSB R/PL

PUSH

HOLD

VECTOR

CJV

COND JUMP

HOLD

VECT

JRP

COND JUMP R/PL

HOLD

RFCT

REPEAT LOOP

≠ 0

HOLD

DEC

CNTR

≠ 0

= 0

POP

HOLD

RPCT

REPEAT PL,

≠ 0

HOLD

DEC

CNTR

≠ 0

= 0

HOLD

CRTN

COND RTN

HOLD

POP

HOLD

CJPP

COND JUMP PL

HOLD

POP

HOLD

& POP

LDCT

LD CNTR &

HOLD

LOAD

CONTINUE

LOOP

TEST END LOOP

HOLD

POP

HOLD

CONT

CONTINUE

HOLD

TWB

THREE-WAY

≠ 0

HOLD

POP

DEC

BRANCH

= 0

PO P

POP

HOLD

P L

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

FULL

(stack full)

The active low output FULL indicates that 9 items have

been loaded onto the stack .

, 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.

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.

(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.

Figure 2: Table of Instructions

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