Intel Pentium III Processor/840, Manual

Page: 36 / 151

3-12 Intel
®
Pentium
®
III Processor/840 Development Kit Manual
Theory of Operation
3.8.2 Board Layout
The board layout is determined by the standard WTX locations for I/O and card slots. The
RDRAM RIMM connectors are positioned so that the two channels are at a right angle to each
other. This allows the straightest connection from the MCH to each RIMM. For the dual-processor
FC-PGA processor system bus, a T-topology using the on-die termination of the Pentium
III
processor has been used.
3.8.3 Mounting Hole Location Considerations
The board mounting hole locations are consistent with the WTX 1.02 specification.
3.8.4 Back Panel I/O Connector Layout
The back panel I/O connector layout is consistent with the WTX 1.02 specification, as shown in
Figure 3-2.
3.9 Power LED Status
Table 3-5 indicates the supported front panel Power LED states as they correspond to the system
states.
Figure 3-2. Back Panel I/O Connector Layout
A7814-01
Keyboard
J1P1 J1K2 J1K1
J1J1
J1L1
J1M1 J1N1
J1P2
Mouse USB COM1 COM2 LAN Audio
Parallel
Table 3-5. PWR System State and LED State
System State LED State
OFF OFF
Running Steady Green
Running with message Blinking Green
Sleeping Steady Yellow
Sleeping with message Blinking Yellow
NOTE: PWR_LED(0:1) are driven by GP0 signals to control the front panel Power LED states when the
system is powered on.