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XIO2000AI 数据表(PDF) 76 Page - Texas Instruments |
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XIO2000AI 数据表(HTML) 76 Page - Texas Instruments |
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76 / 165 page  Classic PCI Configuration Space 67 April 2007 Revised October 2008 SCPS155C 4.38 MSI Message Control Register This register controls the sending of MSI messages. See Table 4−21 for a complete description of the register contents. PCI register offset: 62h Register type: Read-only, Read/Write Default value: 0088h 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 1 0 0 0 1 0 0 0 Table 4−21. MSI Message Control Register Description BIT FIELD NAME ACCESS DESCRIPTION 15:8 RSVD R Reserved. Returns 00h when read. 7 64CAP R 64-bit message capability. This bit is read-only 1b indicating that the bridge supports 64-bit MSI message addressing. 6:4 MM_EN RW Multiple message enable. This bit indicates the number of distinct messages that the bridge is allowed to generate. 000 = 1 message (default) 001 = 2 messages 010 = 4 messages 011 = 8 messages 100 = 16 messages 101 = Reserved 110 = Reserved 111 = Reserved 3:1 MM_CAP R Multiple message capabilities. This field indicates the number of distinct messages that bridge is capable of generating. This field is read-only 100b indicating that the bridge can signal 1 interrupt for each IRQ supported on the serial IRQ stream up to a maximum of 16 unique interrupts. 0 MSI_EN RW MSI enable. This bit enables MSI interrupt signaling. MSI signaling must be enabled by software for the bridge to signal that a serial IRQ has been detected. 0 = MSI signaling is prohibited (default) 1 = MSI signaling is enabled 4.39 MSI Message Lower Address Register This register contains the lower 32 bits of the address that a MSI message writes to when a serial IRQ is detected. See Table 4−22 for a complete description of the register contents. PCI register offset: 64h Register type: Read-only, Read/Write Default value: 0000 0000h BIT NUMBER 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 RESET STATE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 0 0 0 0 0 0 0 Table 4−22. MSI Message Lower Address Register Description BIT FIELD NAME ACCESS DESCRIPTION 31:2 ADDRESS RW System specified message address 1:0 RSVD R Reserved. Returns 00b when read. |
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