AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE Guía de usuario Pagina 93

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Chapter 6: IP Core Architecture 6–19
Avalon-MM Bridge TLPs
December 2013 Altera Corporation Cyclone V Hard IP for PCI Express
User Guide
Figure 6–8 illustrates this Qsys system. (Figure 6–8 uses a filter to hide the Conduit
interfaces that are not relevant in this discussion.)
Figure 6–9 illustrates the address map for this system.
The auto-assigned base addresses result in the following three large BARs:
BAR0 is 28 bits. This is the optimal size because it addresses the
Offchip_Data_Mem which requires 28 address bits.
BAR2 is 29 bits. BAR2 addresses the Quick_Data_Mem which is 4 KBytes;. It
should only require 12 address bits; however, it is consuming 512 MBytes of
address space.
BAR4 is also 29 bits. BAR4 address PCIe Cra which is 16 KBytes. It should only
require 14 address bits; however, it is also consuming 512 MBytes of address space.
Figure 6–8. Qsys System for PCI Express with Poor Address Space Utilization
Figure 6–9. Poor Address Map
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