An implantable cardiac stimulation system and associated method automatically adjust a pre-ventricular atrial blanking period such that far-field R-waves are not detected by the atrial channel as P-waves. The lamination structure, when deposited on an ordinary clear soda-lime float glass sheet 6 mm thick, has a solar factor SF of less than 45% and a light transmission LT of less than 70%. Scan frames output from the scan frame output shift register contain a test response data section and, optionally, a section for outputting other data. One or fork memories maintain an indicator of whether a given fork is active; a list of active forks; a trellis position of active forks in the trellis; and a fork type of one or more forks in the trellis.