User's Manual

Table Of Contents
Rev 1.34, June 2, 2004
Copyright © 2001-2004 Motorola, Inc. All rights reserved. Page 12 of 44
3.2.1. 1394 Configuration EEPROM
The 1394 configuration EEPROM can be located using Figure 1. The label on this device should
read “X100”.
3.2.2. MAC Serial Boot EEPROM
This EEPROM is used each time the MC270141 MAC is reset or powered on. Its content is set
at the factory. Its location can be determined using Figure 1.
4. Evaluation Kit Hardware Description
The Wireless Developer Kit (WDK) contains two UWB transceivers. Additional transceivers can
be purchased to increase the size of a 802.15.3 piconet. Each node connects to a Linux PC for
reporting of statistics, and is powered from an AC outlet via the supplied DC power supply. A
logical block diagram of a transceiver is depicted in Figure 3.
Linux
PC
RS232
1394
MC270141
MAC
MC270123
BaseBand
Controller
MC270113
RF
Transceiver
Video
1394
Chipset
Figure 3: Wireless Developer Kit Logical Block Diagram
As can be seen in Figure 3, each transceiver contains three main subsystems as follows:
A MAC subsystem.
A PHY (physical layer) subsystem consisting of the XSI123 Base Band Controller and
the XSI113 RF Transceiver components.
Two antennas.
These subsystems are implemented on a single printed circuit. A summary describing
interaction of these subsystems is provided here while each is described in slightly more detail
below.
The MAC subsystem configures the PHY subsystem (Base Band Controller and RF-
Transceiver) and implements an 802.15.3-like MAC layer. Included in this MAC layer are
functions such as data buffering, framing and transfer, hardware retransmission, CRC
generation or checking, etc. The MAC also collects performance metrics from the PHY
subsystem and reports them to a host PC.
The PHY subsystem implements two RF processing channels, each called a finger. The
presence of two fingers permits one channel to search for a stronger signal while the other
receives data. The Base Band Controller in the PHY subsystem performs signal processing as
well as forward error correction (FEC) in both receive and transmit modes. In receive mode it