pci core

The BackPlane always contains one core responsible for interacting with the computer. In most cards, it is connected via the pci core. This core has a Core ID of 0x804.

Special PCI core registers are:

Offset	Size (bytes)	Meaning
0x0	4	PCI Control
0x10	4	PCI Arbiter Control
0x20	4	Interrupt Status
0x24	4	Interrupt Mask
0x28	4	Backplane to PCI Mailbox
0x50	4	Backplane Broadcast Address
0x54	4	Backplane Broadcast Data
0x60	4	GPIO In (Rev >= 2)
0x64	4	GPIO Out (Rev >= 2)
0x68	4	GPIO Enable (Rev >= 2)
0x6C	4	GPIO Control (Rev >= 2)
0x100	4	Backplane to PCI Translation 0 (sbtopci0)
0x104	4	Backplane to PCI Translation 1 (sbtopci1)
0x108	4	Backplane to PCI Translation 2 (sbtopci2)

Backplane to PCI Translation 2 (sbtopci2)

Bitmask	Meaning
0x4	Prefetch Enable
0x8	Burst Enable
0x20	Memory Read Multiple

Broadcasting Data Over the Bus

First write the address to the broadcast address register, then the data to the broadcast data register.