Rainbow-electronics ATF22V10CQ Instrukcja Użytkownika Pobierz pdf (Strona 6)

ATF22V10C(Q)

0735P–PLD–01/02

Power-up Reset The registers in the ATF22V10Cs are designed to reset during power-up. At a point

delayed slightly from V

crossing V

RST

, all registers will be reset to the low state. The

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

This feature is critical for state machine initialization. However, due to the asynchronous

nature of reset and the uncertainty of how V

actually rises in the system, the following

conditions are required:

1. The V

rise must be monotonic, and starts below 0.7V,

2. After reset occurs, all input and feedback setup times must be met before driving

the clock pin high, and

3. The clock must remain stable during t

Preload of Registered

Outputs

The ATF22V10C’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 always 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 ATF22V10C fuse pat-

terns. 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/programming.

LOCK

POWER

REGISTERED

OUTPUTS

Parameter Description Typ Max Units

Power-up Reset Time 600 1,000 ns

RST

Power-up Reset Voltage 3.8 4.5 V

1 2 3 4 5 6 7 8 9 10 11 ... 17 18

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