Adaptec AVA-1505A User's Guide download pdf (Page 27)

FAQ’s for Actel’s Antifuse FPGA Programming 27

73. What is the difference between Array, Security, Probe, and Program fuse

types?

Ans. When you program an Actel FPGA with either the APSW software and an Activator, or SculptW

software and Silicon Sculptor, you have the option to select the fuse type. Depending on the device family

you are using, you will be given the options as shown below:

Table 5: Fuse Types

Fuse Types For All Actel Antifuse Devices Except ACT 1 and 40MX

Fuse Types For ACT 1 and 40MX Devices

Array

Security

Array

Probe

Program

The differences between these fuse types are as follows:

 Array Fuses: Used to implement your design on the FPGA

 Security Fuse: Used to disable Silicon Explorer Debugger capabilities

 Probe Fuse: Used to disable Silicon Explorer Debugger capabilities (ACT 1 and 40MX only)

 Program Fuse: Prevents additional data from being programmed into the device (ACT 1 and 40MX

only)

For more information please refer to the Silicon Sculptor User’s Guide

(www.actel.com/documents/silisculptII_sculpt3_ug.pdf).

74. Will parts programmed with Silicon Sculptor have the same checksum

as devices programmed on the Activator?

Ans. Yes.

75. What is the probability of getting a correct checksum but an incorrect

program fuse?

Ans. Each fuse is individually verified during programming and additional programming verification tests

are performed before the checksum is programmed. Programming occurs in this order to ensure that the

array fuses are programmed correctly. All units that pass programming are guaranteed to function

properly.

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Adaptec AVA-1505A User's Guide Page 27