| US 7,499,233 B1 | ||
| Multi-phase control information detection and signal polarity determination | ||
| Ke Han, Fremont, Calif. (US); and Zining Wu, Los Altos, Calif. (US) | ||
| Assigned to Marvell International Ltd., Hamilton (Bermuda) | ||
| Filed on Sep. 24, 2004, as Appl. No. 10/949,533. | ||
| Claims priority of provisional application 60/654126, filed on Apr. 20, 2004. | ||
| Int. Cl. G11B 5/035 (2006.01) | ||
| U.S. Cl. 360—65 [360/39] | 48 Claims |
| 1. An apparatus comprising:
a first detector responsive to a read signal and operable to examine the read signal at alternative framings based on possible
signal polarities of the read signal; and
a second detector responsive to an output of the first detector and operable to find a data pattern that indicates control
information in the read signal and to determine a signal polarity of the read signal by comparing signal quality information
corresponding to the possible signal polarities of the read signal;
wherein the first detector is operable to examine the read signal according to a first framing indicated by the read signal
and a second framing opposite the first framing.
|