Bitfields for CAM address flags:
Bit(s)	Description	)
 7	SG list/data (0 = host, 1 = engine)
 6	CDB pointer    (6-1: 0=virtual addr, 1=phys addr)
 5	SG list/data
 4	sense buffer
 3	message buffer
 2	next CCB
 1	callback on completion
 0	reserved