S845WD1-E Server Board - Viglen Download
S845WD1-E Server Board - Viglen Download
S845WD1-E Server Board - Viglen Download
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Functional Architecture<br />
<strong>S845WD1</strong>-E <strong>Server</strong> <strong>Board</strong> TPS<br />
/ NOTE<br />
Use only ATX12V or EPS12V compliant power supplies with the <strong>S845WD1</strong>-E server board.<br />
ATX12V and EPS12V power supplies have an additional power lead that provides required<br />
supplemental power for the Intel Pentium 4 processor. Always connect the 20-pin (or 24-pin)<br />
and 4-pin (or 8-pin) leads of ATX12V or EPS12V power supplies to the corresponding<br />
connectors on the <strong>S845WD1</strong>-E server board, otherwise the board will not boot.<br />
Do not use a standard ATX power supply. The board will not boot with a standard ATX power<br />
supply.<br />
3.1.1.1 Reset Configuration Logic<br />
The BIOS determines the processor stepping, cache size, etc. through the CPUID instruction.<br />
The requirement is for the processor to run at a fixed speed. The processor cannot be<br />
programmed to operate at a lower or higher speed.<br />
On the <strong>S845WD1</strong>-E platform, the BIOS is responsible for configuring the processor speed. The<br />
BIOS uses CMOS settings to determine which speed to program into the speed setting device.<br />
The processor information is read at every system power-on.<br />
/ NOTE<br />
No manual processor speed setting options exist either in the form of a BIOS Setup option or<br />
jumpers when using production level processors.<br />
3.1.2 Memory Subsystem<br />
The <strong>S845WD1</strong>-E server board provides two DIMM slots and supports a maximum memory<br />
capacity of 2 GB. The DIMM organization is x72 which includes eight ECC check bits. ECC from<br />
the DIMMs are passed through to the processor’s front side bus. Memory scrubbing, single-bit<br />
error correction and multiple-bit error detection is supported. Memory can be implemented with<br />
either single-sided (one row) or double-sided (two row) DIMMs.<br />
/ NOTE<br />
Remove the AGP video card before installing or upgrading memory to avoid interference with<br />
the memory retention mechanism.<br />
/ NOTE<br />
To be fully compliant with all applicable DDR SDRAM memory specifications, the board<br />
should be populated with DIMMs that support the Serial Presence Detect (SPD) data<br />
structure. This allows the BIOS to read the SPD data and program the chipset to accurately<br />
configure memory settings for optimum performance. If non-SPD memory is installed, the<br />
6<br />
Intel order number A93850-002<br />
Revision 2.0
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