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Appendix C
The Raptor MicroATX offers On-board two (optional second one)
10/100 Ethernet controllers and four serial ports (Two RS232 + Two
RS-232 or RS-422/485(optional)).
On-board Ethernet
Each of the 82801E C-ICH's integrated LAN Controllers includes a 32-
bit PCI controller that provides enhanced scatter-gather bus mastering
capabilities and enables the LAN Controller to perform high speed data
transfers over the PCI bus. Its bus master capabilities enable the
component to process high-level commands and perform multiple
operations;
this
communication tasks from the processor. Two large transmit and
receive FIFOs of 3 Kbytes each help prevent data underruns and
overruns while waiting for bus accesses. This enables the integrated
LAN Controller to transmit data with minimum interframe spacing
(IFS).
The LAN Controller can operate in full duplex or half duplex mode. In
full duplex mode the LAN Controller adheres to the IEEE 802.3x Flow
Control specification. Half duplex performance is enhanced by a
proprietary collision reduction mechanism.
The RJ45 Ethernet Connector pin-out of Ethernet 1 (Device 2459h) can
be seen on Table A-14, the Ethernet 1 (Device 2459h) Header
connector pin-out can be seen on Table A-17 and the RJ45 Ethernet
Connector (USB/RJ45 combo) pin-out of Ethernet 2 (Device 245Dh)
(optional) can be seen on Table A-15.
Serial Ports
The Raptor MicroATX has two fixed RS-232 serial ports SER A and
SER B, and two configurable RS-232 or RS-422/485 (optional) serial
ports SER C and SER D.
Ports SER C and SER D may have termination resistors and can be
configured as Full-duplex (RS-422) or Half-duplex (RS-485). The
receiver may be set to always on (RS-422) or enabled by the RTS
Appendix C: Communication Devices
Communication
Devices
lowers
processor
utilization
by
off-loading
55
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