AMD Confidential

User Manual

November 21st, 2008

7.22 XTR Device

XTR is a trace record and playback mechanism that is instrumental for applications that are not dependent on the specific version of the CPU. An XTR trace contains the interaction of the processor with the rest of the system in an XML based log file. The XTR trace file can be played back and could be used to simulate behavior of one or more devices within a system, which in turn may be used to analyze the CPU's performance or to perform conformance analysis between various revs and models of the CPU. XTR may also be used in studies where the behavior of some devices needed but the use of an actual device or its software model is either difficult of impossible due to various constraints.

XTR has two files, a binary file which has the memory dump of the system and an XML based text file which contains the log of the events or messages that go in and out a non- coherent port of the Northbridge, including the DMA signals from devices on the (host‟s) secondary bus to the DIMM. XTR playback mechanism essentially replaces all the devices including the Northbridge and downwards and feeds the processor with the data present in the XTR XML file. The structure of both binary file and XML file is discussed below.

XTR can be used both in uni-processor (XTR-UP) and multi-processor (XTR-MP) configurations. However, currently only XTR-UP is supported while XTR-MP is under development.

There are two modes of XTR, XTR Record and XTR Playback. The simulator supports both modes and one mode does not necessitate the other. The simulator could be used to record XTR traces only or playback XTR traces generated from other sources as far as the XTR specification is followed correctly (see Section 7.22.4, “Limitations”, on page 117).

An XTR XML file contains Initialization Data, Events and Instructions. XTR Initialization data stores the state of CPU just before XTR recording is initiated. This data is used to initialize the CPU and memory parameters during Playback (the memory itself is initialized from the contents of the binary file). Any register that does not have corresponding initialization data in XTR XML file will be initialized with zero. XTR events fall into two categories:

∙Dormant Events, which record an event occurrence but do not trigger an event during playback.

∙Active events that are recorded in XTR file and are actively triggered during playback.

IOR, IOW, MEMR, MEMW, RDMSR are examples of dormant events and INTR, APIC, DMAW, EOT are examples of Active events. XTR Instructions are commands that are injected in the XTR trace to give special instructions during XTR playback. FJMP (Force Jump) is an XTR Instruction.

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Chapter 7: Device Configuration

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AMD 4.4.5 user manual XTR Device
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4.4.5 specifications

AMD 4.4.5 is a robust version of the AMD software ecosystem that focuses on enhanced performance, stability, and efficiency for users relying on AMD processors and graphics cards. This iteration brings various features and technologies designed to optimize gaming, professional applications, and general computing tasks.

One of the standout enhancements in AMD 4.4.5 is the integration of Smart Access Memory technology, which allows the CPU to access the full graphics memory directly. This feature enhances data flow between the CPU and GPU, leading to improved frame rates and overall performance, especially in memory-intensive games. Users can experience a marked increase in gaming performance without the need for additional hardware upgrades.

Another significant feature introduced is the updated Radeon Software Adrenalin Edition. This software update encompasses optimizations for various games, ensuring that gamers can enjoy a seamless experience with the latest titles. The Adrenalin interface also provides features such as Radeon Chill, which helps reduce power consumption during less demanding scenes, and Radeon Anti-Lag, designed to minimize input lag and enhance responsiveness in competitive gaming.

Additionally, AMD 4.4.5 brings the latest drivers that include important performance enhancements and bug fixes that allow for greater system stability. Regular updates ensure that users have the best experience with their AMD hardware, and it significantly bolsters compatibility with the latest gaming titles and software applications.

AMD's Enhanced Sync technology offers users the ability to eliminate screen tearing and stuttering while delivering smooth gameplay. It dynamically synchronizes the refresh rate of the display with the frame rates produced by the GPU, improving the visual experience significantly.

With the introduction of FidelityFX Super Resolution, AMD continues to bolster its suite of technologies that enhance graphics quality and performance. This feature allows lower-resolution images to be upscaled effectively, making it easier for users to enjoy high-end visuals without taxing their hardware excessively.

In summary, AMD 4.4.5 represents a comprehensive update for users by integrating cutting-edge technologies that cater to a wide range of applications from gaming to content creation. With enhancements across the board, AMD reaffirms its commitment to providing high-performance solutions that keep pace with the ever-evolving technology landscape. Whether for gaming aficionados or professional creators, the capabilities offered in this version make it a significant milestone in the AMD software ecosystem.
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