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MaxLoader User’s Guide
73
Device / Data Compare
Compares the data in device to the data in buffer and saves any difference into
the COMPARE.TXT file. When you have a verify error during the Verify
operation, the Data Compare command will be useful. It will detect a
difference between the device content and the buffer content and will write the
difference into the COMPARE.TXT file under the MaxLoader
(TopMax/TopMax 8Gang/ChipMax) directory. You may view the file using
edited utility software.
Device / Erase
This option erases the data in your socket before programming it. This operation
is valid for only limited devices such as EEPROM, Flash Memory, GAL, PEEL
devices. EPROMs that have a window should be erased by UV EPROM erasers
externally (see NOTE “Erasing EPROMs” in this manual).
Device / Security
Secure a PLD or Microcontroller so that their content can no longer be
examined or modified. Security is confirmed when valid data can no longer be
read or verified against a previously read pattern. To ensure that the security
fuse has been blown, the Security operation is preceded by a “read” of the
device and followed by a “verify.” Securing a device prevents the programmed
data pattern into the device from unauthorized access. This command appears
only when the selected device supports it. Some Microcontrollers and PLDs
can be secured by programming a special address location. The security bit will
be cleared when the device is erased. Once a device is secured, it cannot be
unsecured to read, verify, or duplicate. Also the secured device is seen as a
blank chip even though it is not actually blank.