Chapter 4: Theory of operation
61
COM ports
The Super I/O includes two RS-232 compatible serial ports. The Super I/O chip
includes 16C550 compatible UARTs with separate send and receive 16-byte FIFOs.
•
COM 1
: Configured at I/O addresses 3F8–3FFh and uses IRQ4, COM 1 signals
pass through an RS232 transceiver IC and out the front panel via an RJ45
connector, as well as a 10-pin header on the RTM.
•
COM 2
: Configured at I/O addresses 2F8–2FFh and uses IRQ3, COM 2 signals
are available via a standard DB9 connection. The COM 2 connector can only be
accessed by the use of an RTM.
This transceiver’s I/O pins meet the electrical portion of the EIA/TIA-232-E
specification as well as EIA/TIA-232-E. COM 1 signals also go out CompactPCI
J3
connector.
The Super I/O chip allows relocation of these ports to the COM 3 and/or COM 4
standard I/O addresses, respectively. If so configured, COM 3 and COM 4 use I/O
addresses 3E8–3EFh and 2E8–2EFh respectively. If not needed, you can disable these
serial ports in the BIOS setup program’s
I/O Device Configuration sub-menu
to free
the I/O address and interrupt for usage by other expansion products.
Keyboard and mouse controller
The Super I/O provides an integrated keyboard and mouse controller. The Super I/O
keyboard controller, located at I/O locations 60–64h, is functionally equivalent to
the industry standard 8042A controller.
The keyboard interrupt connects to IRQ1. If enabled, the mouse interrupt utilizes
IRQ12. The keyboard and mouse connectors are located on the RTM. For more
information about the RTM, see
Appendix E, Rear Transition module (RTM)
.
IPMI baseboard management controller (BMC)
The EPC-3307 implements an IPMI Baseboard Management Controller (BMC) in
compliance with the PICMG 2.9 R1.0 CompactPCI System Management
Specification. This IPMI BMC provides the ability to monitor, query, and log
system management events on the EPC-3307 and in the CompactPCI system. This
capability provides the ability to detect failing hardware, log the sequence of events
leading to a failure and remotely manage and reset the system.
The EPC-3307 BMC is implemented using the KBC interface mechanism at I/O
locations 0xCA2/3. In order to support legacy RadiSys utilities, I/O locations
0xCA0/1 are also directed to the BMC.
Do not use both the front and rear connections to COM 1 at the same time.
Only one connection to COM 1 may be used at a time.
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