User's Manual
Table Of Contents
- Foreword
- Important Safety Information
- Contents
- About this Document
- Related Publications
- Product Description
- Features
- Specifications
- Air Interface
- Product Functionality
- Contents
- Integration Goal and Objectives
- Customer Problem Isolation
- Wireline and Wireless Communications
- Design Tips for Serviceability
- Environmental Issues
- Regulatory Requirements
- Contents
- Power Supply
- Host Interface
- Power Management
- Antenna Systems
- Hardware Recommendations
- Battery Selection Criteria
- Contents
- Hardware Integration
- Application Software
- Final Assembly
- Installation
- Troubleshooting
- End User Problem Resolution
- Service Depot Repair
- Contents
- Accessories and Options
- Abbreviations and Acronyms
- Desense Overview
- Desense Measurement Techniques
- Preparing the Device Under Test
- Performance Goals
- Methods of Controlling Emissions
- Antenna
- Summary
- FLEX Application Protocol Licensing
- Licensing
4-12 July 23, 2002
Hardware Integration CreataLink2 XT Hardware Integrator’s Guide
Host Interface
There are two scenarios resulting from the use of the battery save cycle. See Figure
4-10 illustrating the state of the RX_Active signal and receiver powerup state.
Scenario 1:
The data transceiver powers up its receiver and there is no message being delivered.
In this case, the receiver will only be powered up for a small part of the entire frame.
Scenario 2:
The data transceiver powers up its receiver and a message is being delivered. In
this case, the receiver is left powered up long enough to receive the message.
A third, but unrelated, scenario which causes the receiver to be powered up is the
initiation of a transmission. The ReFLEX protocol requires that the data transceiver
be receiving at the start of the frame where a transmission will occur to ensure
synchronization to the system before it transmits. In this case, even if the data
transceiver is operating with a collapse of 3 where the data transceiver only wakes
up every 8 frames, the receiver will be powered up before a transmission.
The behavior of the TX_ACTIVE line is similar. When the data transceiver is
actively transmitting a message, the TX_Active signal is activated. When the
transmission subsequently completes, the TX_Active signal is deactivated.
Figure 4-10. Behavior of Receiver Active Line. Assumes collapse is 1 (Wake up every other frame)
Frame 1 Frame 2 Frame 3 Frame 4
Behavior of Receiver Active line. Assumes collapse is
Scenario 1-Wake up, Look for message, and go back to sleep
Scenario 2. Wake up, Receive message in Frame 1, and go back to
sleep
RX_Active
RX_Active