3980xpi Users Manual - Data I/O Corporation

Yield Tally
Yield Total
More Commands / Yield Tally / Yield Tally Output
Commands
The Yield Tally command allows you to maintain programming information on
devices that have been programmed, which is useful in a manufacturing
environment where device yield statistics must be kept.
Yield statistics are maintained on the last 16 device types programmed. When
you run Yield Tally on the 17th device, the statistics for the oldest device are
dropped. The yield tally record uses the manufacturer name and part number
as the device name. The yield data is stored on the Algorithm/System disk or
the 3980 hard drive in the ytally.ytl file. If the file does not exist, enabling the
Yield Tally option creates a blank copy of this file on the disk.
Note: To upload the yield statistics in CRC mode, use command 43]. The
CRC command 46] clears the yield tally statistics. See Appendix B.
Space is allocated on the Algorithm/System disk for the Yield Tally data files.
When the Yield Tally function is run and the Algorithm/System disk is not in the
disk drive, the error message FILE ERROR: Cannot access yield data
is displayed on the terminal. In CRC mode, the programmer responds with
error code 9A if the Algorithm/System disk cannot be found.
The Yield Total includes only those devices with the following error conditions:
illegal bit, misverify, device not programmable, and structured test failure.
(Examples of these conditions are Continuity Check and Electronic ID Error.)
The Yield Tally screen provides statistics for the following categories:
� Device Name
Manufacturer's name and part number. Statistics for the last sixteen device
types are kept.
� Total Count
The number of individual devices of the same type that the programmer
attempted The number of devices successfully programmed.
� Illegal Bit
The number of devices that failed because they did not pass non-blank test
or Illegal Bit Check.
� Verify Fail
The number of devices that failed because they did not verify.
� Struct Fail
The number of logic devices of the same type that failed the logic
structured vector test.
� Device Not Programmable
The number of devices that could not be programmed because they
contained bits that required more programming pulses than were specified.
If you stop the non-blank test without programming the device, the illegal bit
count increases by one. If you continue the test, the illegal bit count stays the
same while the yield tally records the result of the programming operation.
To erase the entire set of statistics, press CTRL+E. To go to the previous menu,
press F2. To go to the Main Menu, press F1. For the total number of errors,
which is not recorded, add the values in the error columns.
3980xpi/3980/3900/2900 User Manual 4-69