Altera Arria V GZ Avalon-ST Manual de usuario Pagina 106

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Bit(s) Field Description
[6:4] multiple message
enable
This field indicates permitted values for MSI signals. For example,
if “100” is written to this field 16 MSI signals are allocated.
3’b000: 1 MSI allocated
3’b001: 2 MSI allocated
3’b010: 4 MSI allocated
3’b011: 8 MSI allocated
3’b100: 16 MSI allocated
3’b101: 32 MSI allocated
3’b110: Reserved
3’b111: Reserved
[3:1]
multiple message
capable
This field is read by system software to determine the number of
requested MSI messages.
3’b000: 1 MSI requested
3’b001: 2 MSI requested
3’b010: 4 MSI requested
3’b011: 8 MSI requested
3’b100: 16 MSI requested
3’b101: 32 MSI requested
3’b110: Reserved
[0] MSI Enable If set to 0, this component is not permitted to use MSI.
Related Information
PCI Express Base Specification 2.1 or 3.0
PCI Local Bus Specification, Rev. 3.0
Hard IP Reconfiguration Interface
The Hard IP reconfiguration interface is an Avalon-MM slave interface with a 10-bit address and 16-bit
data bus. You can use this bus to dynamically modify the value of configuration registers that are read-
only at run time. To ensure proper system operation, reset or repeat device enumeration of the PCI
Express link after changing the value of read-only configuration registers of the Hard IP.
For an example that illustrates how to use this interface, refer to PCI SIG Gen2 x8 Merged Design - Stratix
V on the Altera wiki. The Related Information section below provides a link to this example.
5-54
Hard IP Reconfiguration Interface
UG-01127_avst
2014.12.15
Altera Corporation
Interfaces and Signal Descriptions
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