US 12,260,878 B1
Method and apparatus for multi-stage equalization for reading data from storage media
Nitin Nangare, Sunnyvale, CA (US); and Han-Ting Chiang, Palo Alto, CA (US)
Assigned to Marvell Asia Pte Ltd, Singapore (SG)
Filed by Marvell Asia Pte Ltd, Singapore (SG)
Filed on Mar. 11, 2024, as Appl. No. 18/601,698.
Claims priority of provisional application 63/451,209, filed on Mar. 9, 2023.
Int. Cl. G11B 20/10 (2006.01)
CPC G11B 20/10046 (2013.01) 33 Claims
OG exemplary drawing
 
1. An apparatus for improving equalization when reading data from a storage medium, the apparatus comprising:
a first data path comprising:
a first decoder configured to decode data output from at least one first finite impulse response (FIR) filter; and
first FIR adaptation circuitry configured to adjust a first FIR coefficient for the at least one first FIR filter; and
a second data path comprising:
at least one second FIR filter;
second FIR adaptation circuitry configured to adjust a second FIR coefficient to reach an FIR coefficient for the at least one second FIR filter that achieves a target minimum number of errors, wherein the second FIR adaptation circuitry reaches the FIR coefficient that achieves the target minimum number of errors faster than the first FIR adaptation circuitry; and
a second decoder configured to decode data output by the at least one second FIR filter.