Rainbow-electronics ATF16V8CZ Manual de usuario descargar pdf (Pagina 6)

ATF16V8CZ

Registered Output Preload

The ATF16V8CZ’s registers are provided with circuitry to

allow loading of each register with either a high or a low.

This feature will simplify testing since any state can be

forced into the registers to control test sequencing. A

JEDEC file with preload is generated when a source file

with vectors is compiled. Once downloaded, the JEDEC file

preload sequence will be done automatically by approved

programmers.

Security Fuse Usage

A single fuse is provided to prevent unauthorized copying

of the ATF16V8CZ fuse patterns. Once programmed, fuse

verify and preload are inhibited. However, the 64-bit User

Signature remains accessible.

The security fuse should be programmed last, as its effect

is immediate.

Input and I/O Pin Keeper Circuits

The ATF16V8CZ contains internal input and I/O pin keeper

circuits. These circuits allow each ATF16V8CZ pin to hold

its previous value even when it is not being driven by an

external source or by the device's output buffer. This helps

insure that all logic array inputs are at known, valid logic

levels. This reduces system power by preventing pins from

floating to indeterminate levels. By using pin keeper circuits

rather than pull-up resistors, there is no DC current

required to hold the pins in either logic state (high or low).

These pin keeper circuits are implemented as weak feed-

back inverters, as shown in the Input Diagram below.

These keeper circuits can easily be overdriven by standard

TTL- or CMOS-compatible drivers. The typical overdrive

current required is 40 µA.

Input Diagram

I/O Diagram

Note: 1. Only applicable for version 3.4 or lower.

Compiler Mode Selection

Registered Complex Simple Auto Select

ABEL, Atmel-ABEL P16C8R P16V8C P16V8AS P16V8

CUPL G16V8MS G16V8MA G16V8AS G16V8A

LOG/iC GAL16V8_R

(1)

GAL16V8_C7

(1)

GAL16V8_C8

(1)

GAL16V8

OrCAD-PLD “Registered”“Complex”“Simple” GAL16V8A

PLDesigner P16V8R P16V8C P16V8C P16V8A

Tango-PLD G16V8R G16V8C G16V8AS G16V8

1 2 3 4 5 6 7 8 9 10 11 12

ATF16V8CZ 1
0453F–08/99/xM 12

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Rainbow-electronics ATF16V8CZ Manual de usuario Pagina 6

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