That should give the 49ers a better feel for McDaniels' scheme and play calling when they face the Rams in 2011.
Donatell, 53, was previously defensive coordinator for the University of Washington (2008), Atlanta Falcons (2004-2006) and Green Bay Packers (2000-2003). He was a defensive assistant with the New York Jets in 2007.
Donatell was the Jets' secondary coach when Seattle's Pete Carroll was defensive coordinator (1990-1993) and head coach (1994). He coached at the University of Idaho in the late 1980s when Tom Cable, the Seahawks' new offensive line coach, was a graduate assistant there.
The 49ers also announced Geep Chryst's hiring as quarterbacks coach, Jim Leavitt's hiring as linebackers coach and Mark Uyeyama's promotion to head coach for strength and conditioning.
Chryst was quarterbacks coach for San Diego when new 49ers coach Jim Harbaugh was finishing his career there a decade ago. Chryst spent the last five seasons coaching tight ends and serving as offensive quality control coach under John Fox in Carolina.