7

0735U–PLD–7/10

Atmel ATF22V10C(Q)

4.7

Power-up Reset

V

output buffer.

This feature is critical for state machine initialization. However, due to the asynchronous nature of reset and the

uncertainty of how V

1.

The V

2.

After reset occurs, all input and feedback setup times must be met before driving the clock pin high

3.

The clock must remain stable during t

PR

Figure 4-1.

Power-up Reset Timing

4.8

Preload of Registered Outputs

The ATF22V10C 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.

5.

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.

6.

Security Fuse Usage

A single fuse is provided to prevent unauthorized copying of the ATF22V10C 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.

7.

Programming/Erasing

Programming/erasing is performed using standard PLD programmers. See “CMOS PLD Programming Hardware

and Software Support” for information on software/programming.

Table 7-1.

Programming/Erasing

C

LOCK

POWER

REGISTERED

OUTPUTS

Parameter

Description

Typ

Max

Units

t

PR

Power-up Reset Time

600

1,000

ns

V

RST

Power-up Reset Voltage

3.8

4.5

V