Figure 44: Standard Memory Mapped I/O Mode - Broadcom BCM5722 Programmer's Manual

BCM5722
Standard Mode
Standard mode is the most useful memory mapped I/O view provided by the BCM5722 Ethernet controller (see
64K of host memory space must be made available. The PnP BIOS or OS will program BAR0 and BAR1 with a base address
where the 64K address region may be decoded. The BAR registers point to the beginning of the host memory mapped
regions where BCM5722 Ethernet controller can be accessed.
PCI Configuration Space
BusX
DeviceY
Function Z
BAR0
BAR1
Page 119 Configuration Space
BAR + 0x00000000
BAR + 0x000000FF
BAR + 0x000001FF
BAR + 0x000003FF
BAR + 0x00007FFF
BAR + 0x0000FFFF

Figure 44: Standard Memory Mapped I/O Mode

Bro adco m C orp or atio n
Host Memory Address Space
Physical
Memory
PCI Configuration
Space Registers
(Shadow Copy)
Reserved
High Priority
Mailboxes
Registers
Memory
Window
Programmer's Guide
10/15/07
Figure 44).
Access to this memory
region is remapped by
the hardware.
64K
Document 5722-PG101-R