ATF16V8C

7

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 differ-

ent device. Most PLD compilers can choose the right mode

automatically. The user can also force the selection by sup-

plying the compiler with a mode selection. The determining

factors would be the usage of register versus combinatorial

outputs and dedicated outputs versus outputs with output

enable control.

The ATF16V8C universal architecture can be programmed

to emulate many 20-pin PAL devices. These architectural

subsets can be found in each of the configuration 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.

Notes:

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

2. Only applicable for version 3.4 or lower.

Compiler Mode Selection

Registered

Complex

Simple

Auto Select

ABEL, Atmel-ABEL

P16V8R

P16V8C

P16V8AS

P16V8

With PD ENABLE

P16V8PDR

(1)

P16V8PDC

(1)

P16V8PD

(1)

P16V8PDS

(1)

CUPL, Atmel-CUPL

G16V8MS

G16V8MA

G16V8AS

G16V8A

With PD ENABLE

G16V8CPMS

G16V8CPMA

G16V8CPAS

G16V8CP

LOG/iC

GAL16V8_R

(2)

GAL16V8_C7

(2)

GAL16V8_C8

(2)

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

ATF16V8C (PD) ALL

(1)

Tango-PLD

G16V8R

G16V8C

G16V8AS

G16V8