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The codes for all DesignTags are held in a
central data base. Semiconductor vendors can
choose whether to make their codes “public” or
“private”. The advantage of a public listing is
that all DesignTag Reader Software will be
enabled to detect the code. This will allow
customers, enforcement agencies, or contract
manufacturers the ability to confirm the validity
Issue I 2009
of the device under test (DUT).
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Private codes are preferred when the
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vendor does not wish any third parties to be
able to read the outputs, perhaps because they
are error messages. In this case codes are
distributed by the vendor to trusted parties -
only their reader software with these codes
installed will be enabled to detect the
corresponding tags.
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The IP core is included into the top level
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design as a “black box”, and is delivered as an operation. The thermal readings are input into The signals are
www
encrypted EDIF netlist for security reasons. The the DesignTag Reader Software, which decrypts accumulated and
core includes the in-built code which drives the the signals when required. processed until a
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thermal output and has a small footprint, Detection time for a positive recognition is high confidence is
typically requiring less than 1000 gates. The core measured in minutes, which is much faster and achieved
is largely independent of the user design so the cheaper than other investigation techniques such
impact on the design flow is minimal. as X-Ray or decapsulating tha can take hours.
DesignTag takes any available on-chip clock Poor conditions may increase the time required,
to drive the timing. The core can be set to but the underlying algorithms accumulate
transmit continuously or to self time out after confidence with increased sample sizes. The
power-up. Optionally, the transmit sequence self-heating of the DUT as power is applied will
can be initiated at any to indicate an internal not prevent the tag being detected.
event like an error flag.
The core can be licensed with as many Detecting thermal signals
different in-built codes as required. For with a thermocouple
example, speed grades can be programmed in The DesignTag works with most popular styles of
NV memory at test, and will output a different packages and evaluation work is underway on
code for each selection. In this case, the stacked die. The signals are accumulated and
presence of any one of the correct codes is processed until a high confidence is achieved.
evidence of the mask set that has been used to The low cost DesignTag Starter Kit includes a
create the device. TC-08 data logger with thermocouple from Pico
DesignTag codes are detected by placing a Technology, along with the PC based Reader
thermocouple in good thermal contact with the Software, an evaluation board and five
top of the package while the device is in DesignTag codes.
A thermal approach gives some additional advantages, since it
requires no interruption to the normal operation of the device or
access to electrical connections
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