AMD Confidential

User Manual

November 21st, 2008

Once the simulation is started, the DIMM Device allocates memory arrays to hold the DRAM data. One array is allocated for each bank or virtual bank. In the case of 64-bit memory interfaces, memory arrays are allocated to match the size of the physical banks on each DIMM. If the memory interface is 128 bits, then the memory arrays are sized to the sum of the physical bank pairs that make up the virtual banks. For example:

Virtual bank0 is the combination of physical bank0 on DIMM0 and physical bank0 on DIMM1. If physical bank0 on each DIMM is 32MB in size, then the array allocated for virtual bank0 is sized at 64MB.

Each virtual bank is handled like it is one large bank, rather than two combined smaller banks. The model does not distinguish between addresses that hit in the upper physical bank and addresses that hit in the lower physical bank.

Memory read- and write-messages sent to the DIMM Device use the same structure for both 128-bit and 64-bit interfaces. Each message includes a bank select field, an address field, and a data size field. The bank select field implements the CS7:0 lines while the address field specifies the beginning offset within the bank/virtual bank, and the data size field specifies the size of the datum.

Interfaces

The DIMM device is implemented as a single-interface device. However, the device accepts two distinct classes of messages: RAM read/write messages, and SMBUS reads of SPD data. In most system configurations, the DIMM device is connected to a Northbridge device's DIMM interface as well as a Southbridge device's SMBUS interface.

Initialization/Reset State

On creation of the DIMM device, all RAM arrays are set to all ones, and SPD ROM arrays are cleared. Reset initializes the RAM arrays to all ones, but does not alter the SPD ROM arrays. Configuration options are not affected by reset.

Contents of a BSD

The RAM arrays, SPD ROM arrays, and all configuration option settings are saved in the BSD.

Configuration Options

Chapter 7: Device Configuration

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AMD 4.4.5 user manual Interfaces, Initialization/Reset State
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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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