Jackson was set to become an unrestricted free agent this offseason, but is now bound to a one-year deal.
The Chargers and Jackson squared off last year over Jackson's contract, which prompted the reciever to sit out until October.
Jackson still has a chance to get out of the contract with San Diego, but those chances are very (very, very) slim. Jackson's franchise tag is non-exclusive, which means he can still negotiate with other teams. However, if a team signs him to an offer sheet, they would have to give up two first-round draft picks to San Diego (again, chances are very, very slim).