MagTek TRIPLE TRACK Delta ASIC - Manual (Page 15)

Triple Track ASIC
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fill the 608-bit buffer for each active track (because of “trailing zeroes”), and thus will not produce any
random bits if a full swipe is completed.
The second reason for utilizing the ZEROES FLAG whenever possible concerns timing. Under certain
unlikely conditions involving high ambient noise, it may take up to 3.1 seconds from the start of the card
swipe for the AUXILIARY FLAG to be issued. In some applications it may be desirable to re-arm the
reader for a second swipe more quickly. If a custom-data application not compatible with utilizing the
ZEROES FLAG has one or more 75 bpi tracks, is used in a high ambient noise environment, and requires
a re-arm time of less than 3.1 seconds, then an external method should be used to determine end-of-card
such as a mechanical or optical switch. Upon receiving indication from the switch, the controller can
issue a STOP-STROBE to the ASIC.