Intel PRO/Wireless 2011B LAN &
AC’97 Modem 3A Mini PCI Adapter
Product Specification
“Trilogy 3” MPCI
Version 1.2
th
March 25
, 2002
Trilogy 3 MPCI
M3AWEB/56GA
Product Specification
The information in this manual is furnished for informational use only, is subject to change without notice, and should not be construed as a
commitment by Intel Corporation. Intel Corporation assumes no responsibility or liability for any errors or inaccuracies that may appear in
this document or any software that may be provided in association with this document.
Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or otherwise, to any
intellectual property rights is granted by this document. Except as provided in Intel’s Terms and Conditions of Sale for such products, Intel
assumes no liability whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including
liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual
property right. Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to
specifications and product descriptions at any time, without notice.
Except as permitted by such license, no part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or
by any means without the express written consent of Intel Corporation.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Post-launch product health through end of life ......................................................... 29
Intel Confidential – Controlled Access
Page 5 of 29
Trilogy 3 MPCI
M3AWEB/56GA
Product Specification
Introduction
The primary purpose of this document is to communicate the Intel PRO/Wireless LAN &
AC’97 Modem MPCI Adapter features and specifications to a technical audience.
Trilogy 3 is an Intel codename that references a third generation of wireless LAN
products that are OEMed-in from Symbol Corporation, or based on Intersil Prism 2.5
reference designs. The WLAN and Modem sections of the adapter are completely
separate – including power and interface pins, allowing a WLAN-only version via depopulation of modem components.
Trilogy 3 Product Overview
Trilogy 3 products transfer data at ethernet speeds (11Mbps instantaneous data rate)
over the air between two or more users or between a user and the wired network. The
WLAN is not a single product; it is a digital radio system with product components that
can be configured to meet a multitude of customer requirements. The Trilogy 3 Access
Point (AP) links to a wired LAN via a wired ethernet connection. Wireless NICs
communicate to the wired LAN through the AP. Multiple Access Points are deployed in
a cellular layout plan similar in concept to the cellular telephone base station layout.
Document Purpose
This document defines the functional characteristics of the Trilogy 3 MPCI Adapter. All
of the basic functionality is provided by Intersil as part of their 802.11 DS implementation
for the Intersil PRISM 2.5 radio using the Intersil ISL3874A microcontroller. In particular,
the host interface access mechanisms, packet send, receive, queuing, timer services,
and buffer management are already implemented and do not require further
development. Therefore, this document primarily addresses the radio configuration and
firmware enhancements required for the Trilogy 3 product.
Key Features
• Direct Sequence 802.11b physical layer
• 802.11b High data rate capability – 11 MBPS, 5.5 MBPS, 2 and 1 MBPS
• 3.3 volt Mini PCI Type 3A card (3.3V Aux – Modem)
• 16 bit host interface using PCI IO mode for 802.11b section
• In-line WEP algorithm
• Enhanced power save algorithm for 802.11b section
• Robust roaming and dynamic rate switching for 802.11b section
• Wi-Fi certified 802.11b section
• Microsoft WHQL certified
• Modem Auto-configuration
• Modem v.90 Compliant (software-upgradeable to v.92)
• Hayes Compatible AT modem command set
• Modem Wake On Ring
Intel Confidential – Controlled Access
Page 6 of 29
Trilogy 3 MPCI
M3AWEB/56GA
Product Specification
What’s Not Supported
• The 802.11b firmware does not currently support a low power mode of operation
(< 20 ma). For Idle mode, it removes power to as many circuits as possible, but
the current level of firmware implementation prevents the ISL3874A controller
from using a 32 KHz low power oscillator for sleep mode. Since the controller
and clock will always be active the driver does not require wake-up/resume
operations (although the adapter will consume as little power as possible when
there are no receive, transmit, internal (roam) or host activities in progress.)
• Wake-On-LAN operation is not supported for the 802.11b section of this product.
This is due to the fact that the Intersil chipset does not support 3.3VAUX
detection.
• A hardware “Radio-Disable” switch is not supported for the 802.11b section;
however a software-implemented function is provided to disable radio
transmissions.
• There is no output pin to display 802.11b Activity status via an LED. Displaying
Activity Status is not supported with the current revision of the Intersil chipset and
firmware at this time. Future plans for support of this feature in Intel’s 802.11b
MPCI product are TBD as of Revision 1.2 of this document.
References
Device Specifications
• ISL 3874A Direct Sequence Spread Spectrum Integrated MAC and
Baseband Processor, Intersil Semiconductor, May, 2001
• HFA 3783 I/Q Modem and Synthesizer, Intersil, November, 2000
• ISL 3685 RF/IF Converter and Synthesizer, Intersil, January, 2001
• ISL 3984 RF Power Amplifier and Detector, Intersil, December, 2000
• Mini PCI Specification, Rev. 1.0, October 25, 1999, PCI Special Interest
Group
Intel Confidential – Controlled Access
Page 7 of 29
Trilogy 3 MPCI
M3AWEB/56GA
Product Specification
WLAN System Architecture
The WLAN section of the adapter consists of a 2.4 GHz radio with direct sequence
transmit and receive circuitry using Intersil 3874A Integrated MAC and Base Band
Processor and ISL3685/HFA3783 Intersil radio chipset. The controller circuitry consists
of the Intersil ISL3874A MAC controller with PCI interface, Flash and SRAM.
Crystal oscillators are used to drive the controller and transmit/receive circuits. Power
control circuits are used to selectively enable radio circuitry. Power on reset is
accomplished via a Maxim 6326 Reset IC, and with resistors to select default
configuration parameters and to put circuits into the off state until the firmware has
enabled the outputs from the controller.
Mini PCI Host I/F
ISL3874A
Micro- Controller
FLASH Clock
Radio
Prism 2.5 Based
SRAM
WLAN Block Diagram
The ISL3874A microcontroller section executes under firmware control to process radio,
timer and host events/operations. This chip executes RISC-type instructions in one clock
using a 3-stage pipeline. The chip supports up to 8 active contexts. Context switching
occurs when higher priority events cause an “instant” switch to the appropriate higher
priority context. Contexts can be configured as “foreground” or “background”, where
foreground contexts always have priority, and background contexts operate in a roundrobin fashion. When there are no eligible contexts, the device consumes very little
power. Up to 64 K words of control store and 8 M bytes of RAM buffers are accessible
by the CPU address registers.
All firmware executes from the control store address space in the SRAM in order to
provide the required throughput for 11 MBPS data rates. The 256 KB SRAM supports
low memory variables and host interface, as well as a linked list of send/receive buffers
and host configuration buffers. The upper half of SRAM is used to store the executable
control store code.
The Host PCI interface accesses memory/registers via the ISL3874A controller;
Command/Status registers and Buffer Access Paths are provided to support a simple,
fast interface mechanism. The radio card includes the Direct Sequence send/receive
circuitry, RF synthesizers, reference oscillator, and power switching circuits.
Intel Confidential – Controlled Access
Page 8 of 29
Trilogy 3 MPCI
M3AWEB/56GA
Product Specification
WLAN Component Descriptions
The Intel PRO/Wireless 2011B LAN Mini PCI uses the Intersil Corp. Prism 2.5 Chipset to
implement the spreading, modulation, demodulation and de-spreading. The RF up- and
down-conversion approach is the common superhetrodyne architecture with integrated
chip set (ISL3685/HFA3783) manufactured by Intersil. The channel frequency, fc, is
created (transmit) or converted (receive) by mixing with a low side LO frequency, flo, to
the 374 MHz IF (fc= flo + 374 MHz). The 374 MHz IF is converted to/from baseband
using the Intersil I/Q modulator demodulator HFA3783 IC.
WLAN Transmitter Path
The Intersil ISL3874A baseband processor section creates the transmit waveform and
outputs the signal on the TX I/Q lines. The Intersil HFA3783 up-converts the transmit
baseband signal to 374 MHz. To control the side lobes the transmit signal is passed
through a SAW filter (374 MHz center, 22 MHz BW). The signal is then amplified and
mixed up to the channel frequency using Intersil ISL3685 IC. The LO frequency is
lowside (fc – 374M). The signal is then band-pass filtered, amplified, and low-pass
filtered (2.4 to 2.5 GHz passband) to create the required output power while keeping
spurious and harmonic emissions in spec. Two switches are incorporated at the output
to provide for antenna diversity and receive/transmit switching.
WLAN Receive Path
The receive signal passes through the front-end diversity and transmit/receive switches.
The signal is band-pass filtered and then amplified by Intersil ISL3685 and then downconverted to 374 MHz. The LO frequency is lowside (fc – 374M). The receive signal is
passed through the SAW to provide adjacent channel selectivity. The Intersil HFA3783
creates the baseband I/Q signals and the signal is de-spread and demodulated in the
Intersil ISL3874A.
WLAN Microprocessor Control
The Intersil ISL3874A micro-controller section along with flash and SRAM memory
control the transmitter and receiver. The micro-controller section is derived from the
Intersil HFA3842 and is clocked at 14.67 MHz by a PLL-divided 44 MHz crystal. The
micro-controller along with the embedded firmware runs the 802.11 Media Access
Control (MAC) layer control. The MAC control sends and receives packets and transfers
data to and from the PCI interface to the host computer. The host computer in which the
Mini-PCI is embedded can be a handheld, notebook or fixed computer.
Intel Confidential – Controlled Access
Page 9 of 29
Trilogy 3 MPCI
M3AWEB/56GA
Product Specification
WLAN Frequency Generation
The first and second LO are generated by two external VCOs. The first LO feeds the
Intersil ISL3685 to generate the channel frequency minus 374 MHz. The second LO
which feeds the Intersil HFA3783 is 2 times 374 MHz (748 MHz). A 44 MHz crystal is the
reference for the synthesizers. The synthesizers are controlled by the ISL3874A microcontroller section.
WLAN Hardware Environment
Overview
The Intel PRO/Wireless 2011B LAN Mini PCI Adapter can be used in handheld,
notebook or fixed computers to provide wireless network access. The Adapter
communicates over the air between two or more users or between a user and the
wired network.
Card Dimensions
The Intel PRO/Wireless 2011B LAN Mini PCI Adapter complies with the
dimensional specifications of a Mini PCI Type 3A card. The maximum
dimensions are: height 50.95 mm (2.006 inches,) width 59.75 mm (2.352 inches,)
and thickness 4.9 mm (0.193 inches.)
Intel Confidential – Controlled Access
Page 10 of 29
Loading...
+ 22 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.