Chapter 2
10
CPU/System Cooling Fan Connectors (FAN1/FAN2)
The board's management extension hardware is able to detect
the CPU and system fan speed in rpm (revolutions per minute).
These connectors supports 3-pin cooling fans with minimum
of 4000 RPM. The wiring and plug may vary depending on the
manufacturer. On standard fans, the red is positive (+12V), the
black is ground, and the yellow wire is the rotation signal.
PS/2 Mouse and Keyboard Ports (PT1)
If a PS/2 mouse is used, BIOS will automatically detect and assign
IRQ12 to the PS/2 mouse.
2-4 Main Memory Configuration
The DDR SDRAM memory system consists three banks and can supports the memory
size up to
1GB
per bank
.
If you only use one bank it does not matter which one you
use and if you use two or more banks, it does not matter which bank you install first.
DDR SDRAM Specifications
DIMM type:
2.5V, Registered 64/128/256-bit DDR SDRAM
Module size:
Single/double-sided 64/128/256/512MB/1GB
Parity: Either parity or non-parity
,,4
Double Data Rate transfers allows for data to be fetched on both the rising and falling
edges of the clock thus doubling the effective transfer rate of the clock. For example
a 133MHz DDR clock would achieve a peak transfer rate equal to that of a 266MHz
clock. The effective transfer rate is equal to the clock frequency multiplied by the
bus width, doubled.
Pin
D efinition
1
D ata
2
N o Connec t
3
G round
4
+5V (fused)
5
Cloc k
6
N o Connec t
FSB Frequency
Internal System Bus Freq.
100 MHz
200 MHz
133 MHz
266 MHz
DDR 1
DDR 2
1
Bank1
Bank2
DDR 3
Bank3