
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
Configuration Space Register Access Timing
Figure 4-8: tl_cfg_ctl Timing
The following figure shows typical traffic on the tl_cfg_ctl bus. The tl_cfg_add index increments on
the rising edge of the pld_clk. The address specifies which Configuration Space register data value is
being driven onto tl_cfg_ctl.
pld_clk
tl_cfg_add[3:0]
tl_cfg_ctl[31:0]
2 3 4 5 6 7 8 9 A B 8 9 A B C D E
00... 00... 00... 7F...
00000000 00000000
00... 00...
4-26
Configuration Space Register Access Timing
UG-01097_avmm
2014.12.15
Altera Corporation
64- or 128-Bit Avalon-MM Interface to the Application Layer
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