Bitfields for Cirrus Logic Options word 2 (alternate???):
Bit(s)	Description	)
 15-12	vertical refresh frequency at 1024x768
	0000 43i Hz
	0001 60	 Hz
	0010 70	 Hz
	0011 72	 Hz
	0100 76	 Hz
	other reserved
 11-8	vertical refresh frequency at 800x600
	0000 56 Hz
	0001 60 Hz
	0010 72 Hz
	0011 75 Hz
	other reserved
 7-4	maximum vertical resolution
	0000 480  scanlines
	0001 600  scanlines
	0010 768  scanlines
	0011 1024 scanlines
	other reserved
 3-1	vertical refresh frequency at 1280x1024
	000 43i	 Hz
	001 60	 Hz
	010 71.2 Hz (CL-GD5434 rev. E and F)
	011 74	 Hz (CL-GD5434 rev. E and F)
	other reserved
 0	reserved
SeeAlso: #00032