PROGRAMMING THE PLUS405:

The PLUS405 has a power-up preset feature. This feature insures that the device will power-up

in a known state with all register elements (State and Output Register) at logic High (H). When

programming the device it is important to realize this is the initial state of the device. You

must

provide a next state jump if you do not wish to use all Highs (H) as the present state.

OPTION

CODE

L

OE

OPTION

CODE

H

INITIALIZATION1

INIT

(ALWAYS

ENABLED)

E = 1

INIT/OE

INIT = 0

E

INIT/OE

(INITIALIZATION

DISABLED)

Philips Semiconductors Programmable Logic Devices

Product specification

PLUS405-55

Programmable logic sequencer

(16

× 64 × 8)

October 22, 1993

192

LOGIC PROGRAMMING

INITIALIZATION/OE OPTION – (INIT/OE)

The PLUS405-55 is fully supported by

industry standard (JEDEC compatible) PLD

CAD tools, including Philips Semiconductors

SNAP design software package. ABEL

™ and

CUPL

™ design software packages also

support the PLUS405-55 architecture.

All packages allow Boolean and state

equation entry formats. SNAP, ABEL and

CUPL also accept, as input, schematic

capture format.

PLUS405-55 logic designs can also be

generated using the program table entry

format, which is detailed on the following

pages. This program table entry format is

supported by SNAP only.

To implement the desired logic functions,

each logic variable (I, B, P, S, T, etc.) from the

logic equations is assigned a symbol. TRUE,

COMPLEMENT, PRESET, RESET, OUTPUT

ENABLE, INACTIVE, etc., symbols are

defined below.

INITIALIZATION OPTION – (INIT)

CODE

O

ACTION

INDETERMINATE4

CODE

ACTION

CODE

ACTION

PRESET

H

RESET

L

CODE

–

ACTION

INDETERMINATE4

INIT

P

R

INIT

P

R

INIT

P

R

INIT

P

R

INIT

P

R

“AND” ARRAY – (I), (P)

CODE

O

STATE

INACTIVE1, 2

CODE

STATE

CODE

STATE

CODE

STATE

I, P

H

I, P

L

DON’T CARE

–

Tn

i, p

I, P

Tn

I, P

Tn

I, P

Tn

I, P

Tn

I, P

i, p

i, p

i, p

i, p

i, p

i, p

i, p

Notes are on next page.

ABEL is a trademark of Data I/O Corp.

CUPL is a trademark of Logical Devices, Inc.