Broadcom BCM5722 - Figure 44: Standard Memory Mapped I;O Mode

BCM5722 Programmer’s Guide
10/15/07
Broadcom Corporation
Page 119 Configuration Space Document 5722-PG101-R
Standard Mode
Standard mode is the most useful memory mapped I/O view provided by the BCM5722 Ethernet controller (see Figure 44).
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.
Figure 44: Standard Memory Mapped I/O Mode
Host Memory Address Space
BAR0
BAR1
PCI Configuration Space
Physical
Memory
BusX
DeviceY
Function Z
PCI Configuration
Space Registers
(Shadow Copy)
Access to this memor
y
region is remapped b
y
the hardware.
High Priority
Mailboxes
BAR + 0x00000000
BAR + 0x000000FF
Reserved
BAR + 0x000001FF
BAR + 0x000003FF
Registers
BAR + 0x00007FFF
Memory
Window
BAR + 0x0000FFFF
64K
...