ДШ здесь http://www.siliconimage.com/docs/SiI-DS-0103-D.pdf и ниже

Auto-Initialization
The SiI3114 supports an external flash and/or EEPROM device for BIOS extensions and user-defined PCI
configuration header data.
Auto-Initialization from Flash
The SiI3114 initiates the flash detection and configuration space loading sequence upon the release of
PCI_RST_N. It begins by reading the highest two addresses (7FFFFH and 7FFFEH), checking for the correct data
signature pattern — AAH and 55H, respectively. If the data signature pattern is correct, the SiI3114 continues to

sequence the address downward, reading a total of sixteen bytes. If the Data Signature is correct (55H at
7FFFCH), the last twelve bytes are loaded into the PCI Configuration Space registers.
Note: If both flash and EEPROM are installed, the PCI Configuration Space registers will be loaded with the
EEPROM’s data.

This register defines the Device ID and Vendor ID associated with the SiI3114. The register bits are defined
below.
• Bit [31:16]: Device ID (R/W) – Device ID. This value in this bit field is determined by any one of three
options:
1) This field defaults to 0x3114 to identify the device as a Silicon Image SiI3114.
2) Loaded from an external memory device: If an external memory device — flash or EEPROM — is
present with the correct signature, the Device ID is loaded from that device after reset. See “Auto-
Initialization” section on page 22 for more information.
3) System programmable : If Bit 0 of the Configuration register (40H) is set, the bytes are system
programmable.