The NFL and violence suddenly are an item again but today's topper is an undergraduate -- a Brigham Young defensive tackle who jumped an umpire and rained punches on him until pulled away during Saturday's BYU-Utah State game.

Amazingly, BYU drew 22 penalty calls for 217 yards in a game it won by an equally amazing 70-46 score. But in the midst of all this we find Pulsila Filiaga, a 6-foot-2, 246-pound Cougar junior who, upon ejection by official John Birleffi for a flagrant personal foul, turned his wrath on Birleffi (reportedly inflicting at least a black eye). Now Joe Kearney, Western Athletic Conference commissioner, has suspended Filiaga the rest of the season with probationary status in 1981. . .

In the big league, Pete Rozelle's HQ confirmed that Chicago safety Doug Plank was fined, without disclosing whether the reported $2,000 was correct, for leveling Tampa Bay tight end Jimmie Giles as a pass fell incomplete on Oct. 6. Plank's play defended by Coach Neill Armstrong as Plank sounded many a pass defender's credo: "Anytime you can get another player thinking about something other than his assignment it's good."

Somebody had the Tampa receiving corps thinking wayward thoughts last weekend, for sure. Coach John McKay, who often takes people to task for intimating that Williams too often plays "dumb," was not so gentle with Williams' targets after the loss to Houston. Back-to-back penalties on Larry Mucker (negating an 18-yard completion) and Isaac Hagins, replacing Mucker on the next play, for lining up illegally ruined a promising Buc drive. "Absolutely no excuse," McKay said. "We made a big point of that all week, telling them that when we dropped Giles into the slot position, the wide receiver had to move up onto the line or we would have too many men int the backfield."

In Dallas, Coach Tom Landry & Co. incensed over alleged Eagle spearing -- twice -- of Tony Dorsett, who left the Philly action with bruised ribs. . . In St. Louis, free safety Ken Greene is found to have suffered partially torn knee ligaments in the Redskin game, putting him out four to six weeks -- worse than the three weeks estimated by Joe Sullivan, Card executive guesting at the Quarterback Club here Monday, when he forgave Art Monk for the damaging crackback block (a "rookie mistake"). . .

A flicker of better St. Louis news: ex-Card kicker Steve Little, spinal cord injured as his car crashed last week, has regained some movement in his shoulders and right arm, his wife reports.