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Intel^® EP80579 Integrated Processor
13.8.3 Enhanced Configuration Memory Address Map
The Enhanced Configuration Memory Address Map is positioned into CMI memory space
by use of the PCI Express Enhanced Configuration Base register known as HECBASE.
This register contains the address that corresponds to bits 31 to 28 of the base address
for PCI Express enhanced configuration space below 4 GB. Configuration software will
read this register to determine where the 256 Mbyte range of memory addresses
resides for enhanced configuration. This register defaults to a value of E, which
corresponds to E000 0000 for the IMCH. It is not intended that this value is ever
changed by BIOS.
Figure 13-7. Enhanced Configuration Memory Address Map
0xFFFFFFFF
Bus 255
0xFFFFF
0x1FFFFF
0xFFFFF
0
Bus 1
Bus 0
Located by PCI Express base address
(HECBASE)
0x7FFF
0x1FFF
0xFFFFF
Device 0 Function 0
Device 0 Function 0
Device 0 Function 1
Device 0 Function 0
B4495-01
13.8.4
Enhanced Configuration FSB Address Format
Table 13-5 presents the enhanced configuration address format for the front side bus.
Note that bits 31:28 of Table 13-5 correspond to the default value of HECBASE.
Table 13-5. Enhanced Configuration FSB Address Format
Bits
35:32
31:28
27:20
19:15
14:12
11:00
0h
Eh
Bus Number
Device Number
Function Number
Register Offset
Description
§§
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
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