24888 Rev 3.03 - July 12, 2004AMD-8151TMAGP Tunnel Data Sheet

2:0

DRATE: data transfer mode rate. This field is combined with DevA:0xA4[AGP3MD] to specify

 

the AGP data rate as follows:

 

AGP3MD

DRATE

 

 

X

000

No AGP mode selected.

 

0

001

1x AGP rate; AGP 2.0 signaling.

 

0

010

2x AGP rate; AGP 2.0 signaling.

 

0

100

4x AGP rate; AGP 2.0 signaling.

 

1

001

4x AGP rate; AGP 3.0 signaling.

 

1

010

8x AGP rate; AGP 3.0 signaling.

 

1

100

Reserved.

 

 

 

 

AGP Control Register

 

DevA:0xB0

 

 

 

 

Default: 0000 0000h

 

Attribute: Read-write.

Bits

Description

 

 

 

 

 

 

31:10

Reserved.

 

 

9CALDIS: calibration cycle disable. 1=Calibration cycles (as defined in DevA:0xA8[PCALCYC]) are disabled.

8APEREN: graphics aperture enable. This bit controls no hardware in the IC. It is expected that the state of this bit is copied into the host by software.

7GTLBEN: graphics translation look-aside buffer enable. This bit controls no hardware in the IC. It is expected that the state of this bit is copied into the host by software.

6:0

Reserved.

 

AGP Aperture Size Register

DevA:0xB4

 

 

Default: 0001 0F00h

Attribute: See below.

Bits

Description

 

31:28 PGSZSEL: page size select. Read-write. The only legal value for these bits is 0000b, which specifies

a4-kilobyte page.

27 Reserved.

26:16 Page size support. Read only. These bits are fixed in their default state to indicate that the IC supports 4-kilobyte pages.

15:12 Reserved.

23

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AMD 8151 AGP3MD Drate, AGP Control Register, AGP Aperture Size Register, Default 0001 0F00h Attribute See below

8151 specifications

The AMD 8151 is a notable member of AMD's family of chipsets, designed to complement the AMD K5 and K6 processors. Released in the late 1990s, this chipset was primarily targeted at performance-driven PCs. The AMD 8151 provided users with an array of features and technologies that enhanced the overall computing experience, making it a popular choice among system builders and enthusiasts at the time.

One of the standout features of the AMD 8151 is its support for a 64-bit data bus. This significant design choice allowed for faster data transfer rates and better communication between the CPU and other critical components, such as memory. The chipset was capable of supporting multiple memory configurations, including ECC (Error-Correcting Code) memory, which enhanced system reliability, particularly for servers and workstations.

In terms of connectivity, the AMD 8151 included several integrated controllers, such as the PCI controller, which facilitated connections to various peripherals and expansion cards. With its support for the PCI bus, users could take advantage of high-speed devices, such as graphics cards, sound cards, and network adapters, enhancing the overall functionality of their systems.

Another important characteristic of the AMD 8151 is its power management capabilities. The chipset featured advanced power management technologies, which allowed systems to use energy more efficiently. This not only helped reduce operational costs but also contributed to less heat production, extending the longevity of the components within the PC.

The AMD 8151 also offered robust support for a range of bus speeds, which provided flexibility for users looking to customize their systems. With a maximum bus speed of 66 MHz, it was well-suited for the processors of its time, ensuring compatibility and optimal performance.

Moreover, the AMD 8151 played a crucial role in the development of 3D graphics capabilities. It was designed to work seamlessly with AMD's 3D graphics technology, which allowed for improved visual performance in gaming and multimedia applications. This made it an appealing choice for users who prioritized graphics performance.

Overall, the AMD 8151 chipset embodied the technological advancements of its era, providing enhanced performance, flexibility, and reliability. It stood as a testament to AMD's commitment to innovation in the computing space, marking a significant chapter in the evolution of PC architecture.