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參數資料
| 型號： | 20575 |
| 英文描述： | Wireless LAN DSSS PC Card Reference Design Application ? 220KB (PDF) |
| 中文描述： | 無線局域網擴頻PC卡參考設計中的應用？欺詐郵件（PDF格式） |
| 文件頁數： | 2/25頁 |
| 文件大?。?/td> | 220K |
| 代理商： | 20575 |
Publication#
20575
Issue Date:
April 1997
Rev:
B
Amendment/
0
This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed
product without notice.
Refer to AMD’s Website (www.amd.com) for the latest information.
Wireless LAN DSSS PC Card
Reference Design
Application Note
This application note describes the connection of the PCnet-Mobile Wireless LAN Media Access
Controller (Am79C930) to the HARRIS Semiconductor Direct Sequence Spread Spectrum (DSSS)
PRISM chipset.
INTRODUCTION
The PCnet-Mobile Wireless LAN Media Access
Controller (Am79C930) functionality has been defined
to allow for connection to various PHY types. This ap-
plication note describes one possible connection of the
Am79C930 device to an IEEE 802.11 Direct Sequence
Spread Spectrum (DSSS) PHY. The 802.11-compliant
DSSS PHY used in this application example is the HAR-
RIS Semiconductor PRISM chipset, consisting of the
HARRIS HFA3524, HFA3624, HFA3724, HSP3824,
and HFA3925 devices. The complete solution is con-
nected to a PC CARD bus connector and is intended to
be built onto a TYPE II PC Card (formerly PCMCIA Type
II card). A few additional supporting devices are re-
quired in order to complete the system, e.g., Am29F010
flash memory and 32K SRAM device.
SYSTEM BLOCK DIAGRAM
A complete 802.11 PC CARD TYPE II PC Card
includes the following functional blocks:
I
Am79C930 MAC device
Flash memory
SRAM memory
Oscillators
PRISM chipset and antenna(s)
PC CARD connector
I
I
I
I
I
These devices need to be interconnected as shown in
the block diagram below.
BLOCK DIAGRAM
Spread
Tx/Rcv
FL1
FL2
FL3
FL4
FL5
FL6
LNA
HFA3424
HFA3624
RF/IF
Converter
HFA3925
RF Power
Amp. and Tx/Rx
Switch
P
A
D
VCO
OSC
OSC
I/Q LO
HFA3524 Dual
Synthesizer
Low-Pass
Filter
QModem
QDemod.
Modulator
Filter Cutoff
Select
22 MHZ
22 MHZ
ADC
CCA
I ADC
Q ADC
HSP3824
MDe-
128K
32K
SDe-
Control
Encode
VCO
Data
Control
APCnet
LAN
MAC
CTo HOST
LPFs TX
LPFs RX
Tx/Rx
Clk
Limiting IF/RSSI
20575B-1
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