EP80579 Datasheet, PDF (270/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
The MDA bit may only be set when one of the VGAEN bits is set. If no VGAEN bit is set,
then MDA must not be set either. When the VGA range is already mapped onto the NSI
interface, the MDA range is included as a subset, and the MDA enable is meaningless.
10.1.3
PAM Memory Spaces
The Address range for the PAM memory space is defined in Table 10-4.
Table 10-4. IMCH PAM Memory Address Ranges
From
To
PAMC0
0_000C_0000
0_000C_3FFF
PAMC4
0_000C_4000
0_000C_7FFF
PAMC8
0_000C_8000
0_000C_BFFF
PAMCC
0_000C_C000
0_000C_FFFF
PAMD0
0_000D_0000
0_000D_3FFF
PAMD4
0_000D_4000
0_000D_7FFF
PAMD8
0_000D_8000
0_000D_BFFF
PAMDC
0_000D_C000
0_000D_FFFF
PAME0
0_000E_0000
0_000E_3FFF
PAME4
0_000E_4000
0_000E_7FFF
PAME8
0_000E_8000
0_000E_BFFF
PAMEC
0_000E_C000
0_000E_FFFF
PAMF0
0_000F_0000
0_000F_FFFF
Access Region
ISA Expansion
(16KB/each)
Extended BIOS
(16KB/each)
System BIOS
(64KB)
The 256 Kbyte Programmable Access Memory (PAM) region is divided into three parts:
• ISA expansion region, a 128 Kbyte area between 0_000C_0000h – 0_000D_FFFFh.
• Extended BIOS region, a 64 Kbyte area between 0_000E_0000h – 0_000E_FFFFh.
• System BIOS region, a 64 Kbyte area between 0_000F_0000h – 0_000F_FFFFh.
Specialized programmable hardware in the IMCH supports routing of read and write
accesses within the PAM region independently to memory or to NSI.
Non-snooped transactions are treated accordingly:
• Non-snoop Reads: Memory address 0h. The result is an unsupported request (UR)
completion.
• Non-snoop Writes: Memory address 0h with byte enables deasserted.
The ISA expansion region is divided into eight 16 Kbyte segments. Each segment can
be assigned one of four Read/Write memory states: read-only, write-only, read/write,
or disabled. These segments are typically set to disabled for memory access, which
leaves them routed to NSI for ISA space.
Intel^® EP80579 Integrated Processor Product Line Datasheet
270
August 2009
Order Number: 320066-003US