Adaptec 1737100 Programmer Manual - Page 98

AIC-6915 Ethernet LAN Controller Programmer's Manual PCIComplianceTesting Register Type: R/W Internal Registers Subgroup: PCI Functional Registers Byte Address: 64h - 67h This register is used for PCI compliance checker testing purposes only and has no meaning to the AIC-6915.. Table 7-36. PCIComplianceTesting Register Reset Bit(s) rw Value Description/Function 31:0 r/w 0 PCI compliance data word. IndirectIoAddress Register Type: R/W Internal Registers Subgroup: PCI Functional Registers Byte Address: 68h - 6Bh This register stores the target address for an indirect I/O slave cycle. It can be accessed only in I/O or configuration space, using I/O configuration Read or Write commands. Table 7-37. IndirectIoAddress Register Reset Bit(s) rw Value Description/Function 31:19 r 0 Reserved 18:2 r/w 0 IndirectIoAddress: Points to a word (4-byte) location in the AIC-6915 512-KByte address space. When an external PCI Master starts a legal access to the Indirect I/O Data Port register (IndirectIoDataPort), the PCI target uses the IndirectIoAddress for addressing the requested register. 1:0 r 0 Reserved IndirectIoDataPort Register Type: R/W Internal Registers Subgroup: PCI Functional Registers Byte Address: 6Ch - 6Fh Table 7-38. IndirectIoDataPort Register Reset Bit(s) rw value Description/Function 31:0 r/w IndirectIoDataPort: This is a visual register/data port used by the software to access any location within the 512-KByte address space. It can only be accessed in I/O or configuration space, using I/O or configuration Read or Write commands. When the PCI Target decodes a legal access to this register, it uses the address stored in INDIRECTIOADDRESS to execute the requested read/write operation. A legal I/O access occurs when the least-significant two address bits match the asserted byte enables. 7-26