Because selected regression model is a quadratic equation with a single parameter, it has high speed sufficient for high-level simulation with real bit patterns
We can display, at a glance, the impact on a single bit from all possible previous bit patterns
. We take a long, received bit pattern
and cut out each bit, synchronized with the clock.
So, assume a two's-complement CPU with integer words of 4 bits, and thus there are 16 possible bit patterns
. For some applications it is useful to use this set of residues to identify bit patterns
, the least-positive residue (LPR) system:
This simplifies the process of character recognition somewhat; all the OCR program needs to do is isolate groups of bit patterns
on a page and decide which of the possible 128 ASCII characters (256 in the full ASCII set) is represented by each collection of dots.
To understand the operation of CIS, consider coherent sampling of a periodic signal such as a repeating bit pattern
. The sampling clock derived from the trigger signal via a PLL is set to a frequency slightly lower than an integer submultiple of the bit clock.
Features include the Jitter Wizard, jitter filtering, multiple methodologies for total jitter measurement, ISI plot for measurement of data-dependent jitter without a repeating bit pattern
, and mask error violation locator.
Kikitsu, "Prospects for bit patterned
media for high-density magnetic recording," Journal of Magnetism and Magnetic Materials, vol.
Their method is useful for evaluation of the bit error rate and SNR of shingled bit patterned
An eye diagram is a succession of bit patterns
laid upon one another.
The on-chip, 32-level Voltage Reference can be used as a simple Digital-to-Analog Converter, and the Data Signal Modulator enables designers to create custom bit patterns
using a broad spectrum of inputs.
This is the first time anyone has demonstrated the servo-control operation of a recording head flying on a bit patterned
media with self assembled dots.
Intuitive graphical views of jitter decomposition show the root cause of problems through a periodic jitter spectrum identifying the sources having the most periodic jitter, an ISI Plot isolating bit patterns
contributing the most intersymbol interference, and a DDJ histogram for insight into the distribution of a data dependent jitter.