Specifications

Theory of Operation
EPC-100 Hardware Reference 4-14
registers are located as function 2 of the PIIX3 configuration space and utilize PCI
INTD.
Front Panel Indicators
6 LEDs on the front panel are used as system activity indicators:
RUN (green) The RUN LED is lit whenever a write access to DRAM is made.
This provides a normally lit LED indicating that the CPU is
running. It is not lit if the CPU is halted or is executing entirely
out of the on-chip cache.
cPCI (green) The cPCI LED is lit whenever there is activity on the
CompactPCI bus. The LED is tied to the FRAME# signal on the
CompactPCI bus. This provides a normally lit LED indicating an
access to resources on the CompactPCI bus
SCSI (green) The SCSI LED is lit whenever the SCSI controller is active. This
LED indicates the SCSI controller’s chip select has been
activated.
IDE (green) The IDE LED is lit whenever a primary or secondary channel
hard disk is accessed. This signal indicates a hard disk’s chip
select has been activated. It is asserted when an access to any of
the hard drive addresses occurs.
ETHERNET
(green)
The ETHERNET green LED indicates the Ethernet activity. The LED
indicates the transmit or receive activity for the 10BASE–T, 100BASE–
TX, or 10BASE2 network connections. When on, a packet is being
transmitted or received. When off, there is no transmission activity.
ETHERNET
(yellow)
The ETHERNET yellow LED indicates the Ethernet link status. When
on, the adapter has a valid link on its network connection and is ready
for normal operation (10BASE–T link or 100BASE–TX link). When
off, the adapter did not find a valid 10/100BASE-TX link on its network
connection; transmit and receive are not possible. Note that this LED is
always off when using 10BASE2.