Avila Network Computer Operating Manual
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Compact Flash
The GW2348-4 supports a single Compact Flash socket located on the rear of
the board. The Compact Flash socket accepts small removable mass storage
cards with storage capacities up to 4Gbytes. The Compact Flash interrupt is
mapped to general purpose I/O 12 (GPIO12) of the IXP processor.
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. The
GW2348-4 includes four Mini-PCI sockets. The GW2348-4 increases the Mini-
PCI power specification from a maximum of 2.5W to a total of 18W for all four
sockets. This permits each socket to operate 4.5W for supporting high power
radios.
Ethernet
The GW2348-4 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 AT24C08AN is an Electrically Erasable Programmable Read Only
Memory (EEPROM) with 8Kbits of storage. The 8kbits of storage is organized in
a 1048 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.
