Format of PCI Configuration Data for Intel 82371AB (PIIX4), IDE Controller:
Offset	Size	Description	)
 00h 64 BYTEs	header (see #00878)
		(vendor ID 8086h, device ID 7111h)
 20h	DWORD	I/O base address (for 16 contiguous PORTs)
!!!intel\29056201.pdf p.89
 40h	WORD	primary channel timing register
 42h	WORD	secondary channel timing register
 44h	BYTE	slave IDE timing
 45h  3 BYTEs	reserved???
 48h	BYTE	Ultra DMA/33 control
 49h	BYTE	reserved???
 4Ah	WORD	Ultra DMA/33 timing
 4Ch 180 BYTEs	reserved
SeeAlso: #00873,#01100,#01104,#01105