AU80610004653AAS LBMG Intel, AU80610004653AAS LBMG Datasheet - Page 65

• Manufacturer Part Number: AU80610004653AAS LBMG
• Description: MPU, ATOM PROCESSOR, N450, FC-BGA8
• Manufacturer: Intel
• Series: ATOM - N400r

Specifications of AU80610004653AAS LBMG

• Core Size: 64bit
• Cpu Speed: 1.66GHz
• Digital Ic Case Style: BGA
• No. Of Pins: 559
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Processor Configuration Registers
1.5.35
Datasheet
TOLUD - Top of Low Usable DRAM
B/D/F/Type:
Address Offset:
Default Value:
Access:
Size:
This 16 bit register defines the Top of Low Usable DRAM. TSEG, GTT Graphics Memory
and Graphics Stolen Memory are within the DRAM space defined. From the top,
processor optionally claims 1 to 64MBs of DRAM for internal graphics if enabled 1, 2MB
of DRAM for GTT Graphics Stolen Memory (if enabled) and 1, 2, or 8 MB of DRAM for
TSEG if enabled.
Programming Example:
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C1DRB3 is set to 4GB
BIOS also knows the range from FEC0_0000h to FFFF_FFFFh is not usable by the
system. This 20 MB range at the very top of addressable memory space is lost to
APIC.
According to the above equation, TOLUD is originally calculated to: 4 GB =
1_0000_0000h
The system memory requirements are: 4 GB (max addressable space) -
1 GB (PCI space) - 35 MB (lost memory) = 3 GB - 35 MB (minimum granularity)
= ECB0_0000h. Since ECB0_0000h (PCI and other system requirements) is less
than 1_0000_0000h, TOLUD should be programmed to ECBh.
TSEG is enabled and TSEG size is set to 1MB
Internal Graphics is enabled and Graphics Mode Select set to 32 MB
GTT Graphics Stolen Memory Size set to 2MB
BIOS knows the OS requires 1G of PCI space.
0/0/0/PCI
B0-B1h
0010h
16 bits
RW-L; RO;
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