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Application Specifics Application Specifics
AEROFLEX COLORADO SPRINGS
MIXED-SIGNAL ASIC SOLUTIONS
IN-VEHICLE
HEALTH
MONITORING
PROBLEMS IN
HEALTH MONITORING OF
AIRCRAFT AND AUTOMOTIVE
Wiring
weight and complexity.
Low
reliability.
Limited performance
Data rate.
Noise susceptibility.
System cost
Design, material, support.
Long design cycle time.
Wireless node cost
Supporting circuitry
for wireless protocol.
Size
Difficult to miniaturize each node.
Wireless asynchronous data acquisition.
SOLUTION =
AEROFLEXS NEW NIC/NDI
NETWORK ASICS WITH
INTELLIBUS PROTOCOL
Single cable
Daisy-chained twisted-pair
wiring between nodes.
High data rates
Up to 30Mbps.
Low cost
Low device count at each node.
Isochronous data acquisition
Network-
wide simultaneous sampling.
800-645-8862
See Aeroflexs AX7000-NIC and our
AX30NDI data sheets at
www.aeroflex.com/mixedsignal
NDI
1
NDI
2
NDI
3
NDI
4
NDI
n
Network
Interface
Controller
(inside PC)
Example: 8 actuators
or position sensors What is the IntelliBus
TM
Protocol?




IntelliBus is a Boeing-developed serial databus
communication standard designed to network
sensors, actuators, and subsystems while providing
the simplicity necessary for miniature smart sensors,
the low latency needed for flight controls, the time
determinism required for data analysis, and the
distance for industrial control. IntelliBus permits the
integration of signal conditioning, analog-to-digital
conversion, and digital interfacing into a low-cost
package that can be installed in any sensor, actuator,
interface module, or system. Aeroflex Colorado
Springs (Aeroflex) licensed the IntelliBus standard to
market products in 2004.

IntelliBus has a low overhead that enables maximum
data transmittal, accommodates both sensors and
actuators for monitoring and control, and incorporates
fault avoidance features. Additionally, IntelliBus
accommodates a high sensor count per bus (over
500), allows synchronization between multiple
busses, simultaneous sampling capability, and
isochronous transmission with low jitter (+/- 500ps).
IntelliBus is time deterministic and enables high data
rates per bus (30, 15, and 7.5 Mbps) while
maintaining a low cost-per-node.

Aeroflex has developed a Network System product
family consisting of a Network Interface Controller
(NIC) and a Network Device Interface (NDI) to
address a variety of communication and control
network requirements in the Factory Floor Automation
and In-Vehicle Health Monitoring fields. Features
include:

A standard set of functions and services that
locate, configure, and operate a wide range of
transducer devices

A mechanism to acquire and distribute data: Synchronously
At multiple sample rates
Simultaneously with minimal acquisition jitter

Minimal network latency without strict constraints
on communication at the peripheral device

Support of device (node) memory containing
node information and automatic peripheral
configuration (at boot)

Multi-cast connectivity to a large number of
peripheral devices

A mechanism for any node to filter and trap
network data

Low-overhead time-deterministic device-to-
device data transfers

Data buffering to minimize network latency

Low-cost, EMC compliant physical layer: easy-
maintenance twisted-pair copper

Capable of 30 Mbps data rate

Scalable hardware, firmware and software
A. Physical and Data Link layers (OSI layers 1-2)
Per the product features listed above, twisted pair
copper wiring is utilized with M-LVDS (Multipoint-Low-
Voltage Differential Signaling) data transceivers for
high-speed (30 Mbps) signaling, or RS-485
transceivers for lower speed applications. Off-the-
shelf transceivers are used. Due to proprietary bit
sampling schemes in the receiver, no clock recovery
or re-syncing is necessary in the physical layer (layer
1), only signal level translation and output tri-stating is
required.

The typical Aeroflex NIC/NDI network system consists
of one bus controller and multiple nodes. Half duplex
data transmission occurs, where only the bus
controller or the addressed node is actively
transmitting data. More than one node may be
receiving the data. (Full-duplex communication is
possible on a single controller-to-node system. The
Data Link layer (layer 2) support is provided by two
hardware functions: the Network Interface Controller
(NIC) and the Network Device Interface (NDI).

The AX7000 Network Interface Controller (NIC)
The NIC function is the master bus controller for the
Aeroflex NIC/NDI network. Connecting directly to a
physical layer transceiver, the NIC controls the
scheduling of data communications on the network by
issuing commands to the NDI devices on the network.
Typically a PCI card in a host PC, the NIC uses a set
of IntelliBus protocol NIC opcodes which allow host
modification access to the NIC scheduler, as well as
direct access to network data.

The AX30 Network Device Interface (NDI)
The NDI function is the miniaturized interface chip
connecting peripheral devices onto the Aeroflex
NIC/NDI serial network. The IntelliBus protocol allows
each NDI device to support up to 16 peripherals (or
channels). These peripherals can range from simple
sensors or indicators to complex audio/visual
components. With 30 Mbps of throughput on the
physical bus, many NDI chips can be supported on a
single Aeroflex NIC/NDI network, with the maximum
addressable range of up to 509 channels per bus.
B. Presentation layer (OSI layer 6)
Included in the NDI is support for serial data
communications with peripherals via SPI, ISC, I2S
and UART ports. The number of ports (channels)
available within a specific NDI determine the pin count
and size of the device; thus, a range of NDI device
package sizes supports a variety of peripheral area
constraints. Input and output FIFO buffering is
provided within the NDI to support the difference in
data rates between the peripherals and the high-
speed Aeroflex NIC/NDI traffic rate.
C. Application layer (OSI layer 7)
Included in the NDI is flexible support for a large
variety of signal processing and signal conditioning
devices, such as:


Analog to Digital Converters

Digital to Analog Converters

Microcontrollers

Digital I/O (switches, indicator drive)

Inter-node communication 1
Standard Products
AX7000-NIC Network Interface Controller (NIC)
Preliminary Datasheet
- May 2005
www.aeroflex.com/mixedsignal


FEATURES
Supports IntelliBus
TM
Protocol v3.0
Dual IntelliBus Network Ports
Full and Half Duplex Support
IntelliBus RS-485 Physical Layer
Synchronous Data Rates up to 15.0 Mbps
Asynchronous Data Rates of 7.5, and 15.0 Mbps
256K Word Schedule Memory
256 Word Dynamic Schedule Register Space
1K Word Deep Receiver FIFOs
External IntelliBus Power Source
APPLICATIONS
Sensor Integration
Factory Floor Automation
In-Vehicle Healthy Monitoring
Process Control Systems
BENEFITS
Network Interface Controller (AX7000-NIC)


GENERAL DESCRIPTION
The AX7000-NIC Network Interface Controller (NIC) is a
third generation controller design specifically to be used as
a controller in a PC based IntelliBus development system.
The card plugs directly into a 66Mhz, 32-bit 3.3V PCI
V2.2 compliant slot in a Pentium PC compatible computer.
The card supports two semi-independent IntelliBus serial
channels, which operate in asynchronous

mode supporting
the IntelliBus Isochronous (IS) communications tier at data
rates up to15Mbps. The IntelliBus network channels are
implemented using the IntelliBus RS-485 physical layer
and can be configured in a Half or Full Duplex arrange-
ment. The card contains a 1K word deep FIFO for each of
the two network receiver channels. This allows real time
data collection using a standard PC operating system. All
control and data retrieval operations are handled by soft-
ware through registers implemented in the PCI interface.
The card supports a custom microcode instruction set that
is used to control the execution of a schedule. The micro-
code is loaded, by software, into onboard schedule mem-
ory. The card contains status lights for a real time
indication of the state of the network. The NIC controls all
I/O from an Interface Card.
The AX7000-NIC is manufactured at Aeroflex Colo