Introduction
5
cPCI-6840
On the RTM, the Secondary IDE is implemented on a Compact-
Flash socket and a 44-pin connectors for 2.5 inches IDE drive.
Gigabit Ethernet Ports
The cPCI-6840 has three 10/100/1000Mbps Ethernet (GbE) ports.
Every port is assigned a unique static MAC Address.
The onboard Intel® 82546GB dual-port Gigabit Ethernet controller
provides two Ethernet ports. The 82546GB is connected to the 64-
bit/66 MHz PCI bus to achieve the full communications bandwidth.
The 82546GB supports IEEE 802.3x compliant flow control and
IEEE 802.3ab compliant 10/100/1000 Mbps auto-negotiation. The
two GbE ports are connected to J3 based on PICMG 2.16 specifi-
cations.
The third LAN port uses a 82541PI controller on the 32-bit/33 MHz
PCI bus. The RJ-45 connector of the third LAN port is on the front
panel for system management or serviceability requirement. Users
can disable or enable the third LAN port from the BIOS menu.
Universal Serial Bus (USB)
The cPCI-6840 provides four USB version 2.0 ports. Two ports are
on the front panel and another two ports are on the RTM. The Uni-
versal Serial Bus (USB) provides a common interface to versatile
peripherals such as keyboard, mouse, printer, USB flash disk, etc.
Serial I/O
Two serial ports are supported on cPCI-6840. COM1 is available
as a RJ45 connector on the front panel. COM2 is also a standard
RJ-45 connector on the rear panel of RTM. Both ports are be con-
figured as Data Terminal Equipment (DTE). Firmware initializes
the two serial ports as COM1 and COM2 with ISA I/O base
addresses of 3F8h and 2F8h respectively. This default configura-
tion also assigns COM1 to IRQ4 and COM2 to IRQ3. Optional
COM3 and COM4 ports are available for ODM/OEM projects via
the Winbond 83627HG. COM3 may be accessed via a cable, how-
ever COM4 may require a custom RTM.
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