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XIO2001IPNP 数据表(PDF) 63 Page - Texas Instruments |
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XIO2001IPNP 数据表(HTML) 63 Page - Texas Instruments |
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63 / 131 page ![]() XIO2001 www.ti.com SCPS212D – MAY 2009 – REVISED JANUARY 2010 4.46 PCI Express Capability ID Register This read-only register identifies the linked list item as the register for subsystem ID and subsystem vendor ID capabilities. The register returns 10h when read. PCI register offset: 70h Register type: Read-only Default value: 10h BIT NUMBER 7 6 5 4 3 2 1 0 RESET STATE 0 0 0 1 0 0 0 0 4.47 Next Item Pointer Register The contents of this read-only register indicate the next item in the linked list of capabilities for the bridge. This register reads 00h, indicating no additional capabilities are supported. PCI register offset: 71h Register type: Read-only Default value: 00h BIT NUMBER 7 6 5 4 3 2 1 0 RESET STATE 0 0 0 0 0 0 0 0 4.48 PCI Express Capabilities Register This read-only register indicates the capabilities of the bridge related to PCI Express. See Table 4-24 for a complete description of the register contents. PCI register offset: 72h Register type: Read-only Default value: 0072h BIT NUMBER 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 RESET STATE 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 1 Table 4-24. PCI Express Capabilities Register Description BIT FIELD NAME ACCESS DESCRIPTION 15:14 RSVD R Reserved. Returns 00b when read. 13:9 INT_NUM R Interrupt message number. This field is used for MSI support and is implemented as read-only 00000b in the bridge. 8 SLOT R Slot implemented. This bit is not valid for the bridge and is read-only 0b. 7:4 DEV_TYPE R Device/port type. This read-only field returns 0111b indicating that the device is a PCI Express-to-PCI bridge. 3:0 VERSION R Capability version. This field returns 2h indicating revision 2 of the PCI Express capability. Copyright © 2009–2010, Texas Instruments Incorporated Classic PCI Configuration Space 63 Submit Documentation Feedback Product Folder Link(s): XIO2001 |
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