4. Commands
4-14 UniSite-xpi User Manual
• Program Security Fuse (Y,N)—Enables or disables the programming
of the security fuse. To program the security fuse, set this parameter
to Y and set the Security Fuse Data parameter to 1. This parameter
defaults to N, which disables programming of the security fuse.
Optional Parameter
Screens There are two types of parameter-entry screens: simple and complex.
UniSite-xpi defaults to displaying the simple, Non-default Parameters
screen. If you want to view the complex, All Parameters screen, press F4
from the Non-default Parameters screen. If you have changed any of the
default parameters, those changed parameters will also appear on the
Non-default Parameters screen.
The following parameters are found on the complex, all parameters
Program Logic Device screen.
• Illegal Bit Check (Y,N)—Enables or disables the illegal-bit test.
When enabled, this test compares data in a device against data in
UniSite-xpi’s RAM to determine if the device has
already-programmed locations of incorrect polarity. For example,
UniSite-xpi returns an illegal-bit error in the following situation: data
in RAM indicates a specific bit should be in an unprogrammed state
while the corresponding bit in the device is in a programmed state.
The device cannot be programmed if UniSite-xpi detects an illegal bit.
This parameter is enabled by default.
• Blank Check (Y,N)—Enables or disables the blank check test. A
Blank Check test checks a device for programmed bits. This
parameter defaults to Y, which enables the test.
• Enable Yield Tally (Y,N)—When enabled, directs UniSite-xpi to keep
a running tally of the programming yields for the last sixteen types of
devices programmed. These totals show how many devices passed
and failed, and what specific errors, if any, have occurred. This
parameter defaults to N, which disables the test. A more complete
description of this feature can be found in the “Yield Tally” section of
this chapter.
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