ATF22LV10CZ_98 Просмотр технического описания (PDF) - Atmel Corporation

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ATF22LV10CZ_98

High Performance E2 PLD

Atmel Corporation 

Power Up Reset

The registers in the ATF22LV10CZ are designed to reset

during power up. At a point delayed slightly from VCC

crossing VRST, all registers will be reset to the low state.

The output state will depend on the polarity of the buffer.

This feature is critical for state machine initialization.

However, due to the asynchronous nature of reset and the

uncertainty of how VCC actually rises in the system, the

following conditions are required:

1. The VCC rise must be monotonic and start below 0.7V

3. The clock must remain stable during TPR.

2. After TPR, all input and feedback setup times must be

met before driving the clock pin high.

Preload of Register Outputs

The ATF22LV10CZ’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 most

of the approved programmers after the programming.

Electronic Signature Word

There are 64 bits of programmable memory that are al-

ways available to the user, even if the device is secured.

These bits can be used for user-specific data.

Security Fuse Usage

A single fuse is provided to prevent unauthorized copying

of the ATF22LV10CZ 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.

Programming/Erasing

Programming/erasing is performed using standard PLD

programmers. See CMOS PLD Programming Hardware

& Software Support for information on software/program-

ming.

Parameter

Description

Typ

TPR

Power-Up

Reset Time

600

VRST

Power-Up

Reset Voltage

2.3

Max

1,000

2.7

Units

ns

V

6

ATF22LV10CZ

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