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Chapter 4 Demo Waveforms
Demo 2: Data-to-Clock
Overview
The drive is formatted so a "start-of-sector" pulse is used to trigger the
TIA once for each sector. The start-of-sector pulse occurs 30 µs prior to the
beginning of the data portion of the sector. The data portion of the sector
is 200 µs in duration. There are 64 sectors around the track.
This is the TIA setup menu to make data-to-clock measurements on this
formatted drive. Notice that this screen is similar to the data-to-data
configuration used in demonstration 1. However, the time delay from the
trigger, and the acquisition time has been modified as this data was
captured from a different drive. Reading from left-to-right you can see
that the TIA will wait for a trigger, delay 27 µs and then measure for
200 µs. This sequence is repeated 64 times to build a histogram. The
acquisition contains 64 consecutive sectors of data-to-clock measurements.
Notice that the time delay from trigger was set too small (27 µs instead of
30 µs) and as a result, the TIA made a few measurements in the header
(non-data) region. These "errant" measurements will be used later to
further illustrate capabilities of the software.
4-16
Getting Started Guide
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