RCRB
General
As mentioned in “Root Complex Register Blocks (RCRBs)” on page 765, a Root Port may optionally implement a Root Complex Register Block (RCRB) as a 4KB block of memory-mapped IO registers that can include one or more of the optional PCI Express extended capabilities and other implementation specific registers that apply to the Root Complex. An RCRB must not reside in the same memory-mapped IO address space as that defined for normal PCI Express functions. Multiple Root Ports or internal devices may be associated with the same RCRB (see Figure 24-44 on page 958 for an example).
Figure 24-44. RCRB Example
Firmware Gives OS Base Address ...
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