10H20EV8-4F datasheet(5/17 Pages) PHILIPS

Part #	10H20EV8-4F

Description	ECL programmable array logic

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors Programmable Logic Devices

Product specification

10H20EV8/10020EV8

ECL programmable array logic

October 22, 1993

117

D

AP

AR

D

Q

CK

Q

D

AP

AR

D

Q

CK

Q

Registered Active-HIGH

Registered Active-LOW

D

Combinatorial Active-HIGH

Figure 2.

Output Macro Cell Configurations

D

Combinatorial Active-LOW

OUTPUT MACRO CELL

CONFIGURATION

Shown in Figure 2 are the four possible

configurations of the output macrocell using

fuses S0 and S1. As seen, the output can

either be registered Active-HIGH/LOW with

feedback or combinatorial Active-HIGH/LOW

with feedback. If the registered mode is

chosen, the feedback from the Q output to

the AND array enables one to make state

machines or shift registers without having to

tie the output to one of the inputs. If a

combinatorial output is chosen, the feedback

gate is enabled from the pin and allows one

to create permanent outputs, permanent

inputs, or I/O pins through the use of the

output enable (D) product term.

OUTPUT ENABLE

Each output on the 10H20EV8/10020EV8

has its own individual product term for output

enable. The use of the D product term

(direction control) allows the user three

possible configurations of the outputs. They

are: always enabled, always disabled, and

controlled by a programmed pattern. A HIGH

on the D term enables the output, while a

LOW performs the disable function. Output

enable control can be achieved by

programming a pattern on the D term.

The output enable control can also be used

to expand a designer’s possibilities once a

combinatorial output has been chosen. If the

D term is always HIGH, the pin becomes a

permanent Active-HIGH/LOW output. If the

D term is always LOW (all fuses left intact),

the pin now becomes an extra input.

PRESET AND RESET

The 10H20EV8/10020EV8 also includes a

separate product term for asynchronous

Preset and asynchronous Reset. These lines

are common for all registers and are asserted

when the specific product term goes HIGH.

Being asynchronous, they are independent of

the clock. It should be noted that the actual

state of the output is dependent on how the

polarity of the particular output has been

chosen. If the outputs are a mix of

Active-HIGH and Active-LOW, a Preset

signal will force the Active-HIGH outputs

HIGH while the Active-LOW outputs would go

LOW, even though the Q output of all

flip-flops would go HIGH. A Reset signal

would force the opposite conditions.

PRELOAD

To simplify testing, the 10H20EV8/10020EV8

has also included PRELOAD circuitry. This

allows a user to load any particular data

desired into the registers regardless of the

programmed pattern. This means that the

PRELOAD can be done on a blank part and

after that same part has been programmed to

facilitate any post-fuse testing desired.

It can also be used by a designer to help

debug a circuit. This could be important if a

state machine was implemented in the

10H20EV8/ 10020EV8. The PRELOAD

would allow the entry of any state in the

sequence desired and start clocking from that

particular point. Any or all transitions could be

verified.

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