User manual

ATHENA CPU User Manual V1.40 Page 32
8. SYSTEM I/O
8.1 Ethernet
Athena includes a 10/100Mbps Ethernet connection using Cat-5 (100BaseT) wiring. The signals
are provided on a 6-pin header (J4) on the right edge of the board.
Diamond Systems’ cable no. 698002 mates with the header and provides a standard RJ-45
connector in panel-mount form for connecting to standard Cat5 network cables.
1 Common
2 RX-
3 Common
4 RX+
5 TX-
6 TX+
Table 18: J11 – Ethernet Connector
The Ethernet chip is the National Semiconductor DP83815 MacPhyter chip. It is connected to the
system via the board’s internal PCI bus.
The Athena Software CD includes Ethernet drivers for Windows 95, Windows 98, Windows NT,
and Linux. The latest drivers can also be downloaded from National Semiconductor’s website at
www.national.com. Search for DP83815 to reach the product folder.
A DOS utility program is provided for testing the chip and accessing the configuration EEPROM.
Each board is factory-configured for a unique MAC address using this program. To run the
program, you must boot the computer to DOS. The program will not run properly in a DOS
window inside of Windows. In normal operation this program should not be required.
Additional software support includes a packet driver with software to allow a full TCP/IP
implementation.
8.2 Serial Ports
Athena contains 4 serial ports. Each port is capable of transmitting at speeds of up to
115.2Kbaud. Ports COM1 and COM2 are built into the standard chipset. They consist of standard
16550 type UARTs with 16-byte FIFOs.
Ports COM3 and COM4 are derived from an Exar 16C2850 dual UART chip and include 128-byte
FIFOs. Ports 3 and 4 may be operated at speeds up to 460Kbaud with installation of high-speed
drivers as a custom option.
The serial ports use the following default system resources:
Port Address range IRQ
COM1 I/O 3F8 – 3FF 4
COM2 I/O 2F8 – 2FF 3
COM3 I/O 3E8 – 3EF 9
COM4 I/O 2E8 – 2EF 15
Table 19: COM PORT Default Resource Listing