Functional Logic Diagram Description

The Logic Option and Functional Diagrams describe the

ATF16V8C architecture. Eight configurable macrocells

can be configured as a registered output, combinatorial

I/O, combinatorial output, or dedicated input.

The ATF16V8C can be configured in one of three different

modes. Each mode makes the ATF16V8C look like a dif-

ferent device. Most PLD compilers can choose the right

mode automatically. The user can also force the selection

by supplying the compiler with a mode selection. The de-

termining factors would be the usage of register versus

combinatorial outputs and dedicated outputs versus out-

puts with output enable control.

The ATF16V8C universal architecture can be pro-

grammed to emulate many 20-pin PAL devices. These ar-

chitectural subsets can be found in each of the configura-

tion modes described in the following pages. The user can

download the listed subset device JEDEC programming

file to the PLD programmer, and the ATF16V8C can be

configured to act like the chosen device. Check with your

programmer manufacturer for this capability.

Unused product terms are automatically disabled by the

compiler to decrease power consumption. A Security

Fuse, when programmed, protects the content of the

ATF16V8C. Eight bytes (64 fuses) of User Signature are

accessible to the user for purposes such as storing project

name, part number, revision, or date. The User Signature

is accessible regardless of the state of the Security Fuse.

Compiler Mode Selection

Registered

Complex

Simple

Auto Select

ABEL, Atmel-ABEL

P16V8R

P16V8C

P16V8AS

P16V8

with PD ENABLE

CUPL, Atmel-CUPL

G16V8MS

G16V8MA

G16V8AS

G16V8A

with PD ENABLE

G16V8CPMS

G16V8CPMA

G16V8CPAS

G16V8CP

LOG/iC

GAL16V8

OrCAD-PLD

“Registered”

“Complex”

“Simple”

GAL16V8A

PLDesigner

P16V8R

P16V8C

P16V8C

P16V8A

Synario/Atmel-Synario

NA

NA

NA

ATF16V8C ALL

with PD ENABLE

NA

NA

NA

Tango-PLD

G16V8R

G16V8C

G16V8AS

G16V8

Notes: 1. Please call Atmel PLD Hotline at (408) 436-4333 for more information.

2. Only applicable for version 3.4 or lower.

ATF16V8C

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