Avila Network Computer Operating Manual
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Mini-PCI Sockets
Mini-PCI is a small form factor PCI card that uses the same signal protocol,
electrical specifications, and configuration definitions as conventional PCI. There
are up to four Mini-PCI sockets available on the GW2342. There are a wide
variety of Mini-PCI cards available for expanding the networking functionality of
the GW2342. Even though the mini-PCI specification limits the socket operating
power to 2.5W, there is a total of 14W to be distributed as needed.
Ethernet
The GW2342 supports two Ethernet ports using an Intel LXT973 PHY
Transceiver. Both channels operates in a 100BASE-TX or 10BASE-T
configuration and support auto MDI/MDIX for automatically switching twisted pair
inputs and outputs. Additional features include full-duplex operation for both
10Mbps and 100Mbps configurations as well as support for auto-negotiation. The
Ethernet ports are available through standard RJ45 connectors. The connectors
have two integrated status lights. The green status light indicates link and
activity. The light is on for link and blinking for activity. The yellow status light
indicates speed. The light is on for 100Mbps and off for 10Mbps.
EEPROM
The Atmel AT24C16AN is an Electrically Erasable Programmable Read Only
Memory (EEPROM) with 16Kbits of storage. The 16kbits of storage is organized
in a 2048 x 8-bit configuration. Additional features include 1,000,000 erase/write
cycles and a 100-year minimum data retention time. Data is transmitted to and
from the EEPROM over the processor I2C bus. The I2C clock frequency is 0 to
400KHz. The I2C base address is A0 hex for writes and A1 hex for reads.
Real Time Clock
The Dallas Semiconductor DS1672 is designed to count seconds and can be
used to derive time-of-day, week, month, and year using software. A battery
ensures uninterrupted operation when the main power supply drops below the
battery voltage. The battery capacity is 35mAH. The real time clock requires
0.425 micro amps typical and 1 micro amp maximum for backup operation. This
results in a battery life of 4 years minimum and more than 9 years typical. Data is
transmitted to and from the Real Time Clock over the processor I2C bus. The I2C
clock frequency is 0 to 400KHz. The I2C base address is D0 hex for writes and
D1 hex for reads.
Temperature and Voltage Monitor
The Analog Devices AD7418 provides temperature and voltage monitoring
capability. The GW2342 operating temperature is monitored through this device.
The temperature accuracy is
±
1
°
C at 25
°
C and
±
2
°
C over the entire temperature
range of -40
°
C to +125
°
C. The GW2342 input voltage is also monitored through
this device. A resistor divider is used on the A/D input to scale the input voltage
down. Multiple the A/D voltage reading by 23.1 to get the actual input voltage.
Data is transmitted to and from the Temperature and Voltage Monitor over the
