24888 Rev 3.03 - July 12, 2004

AMD-8151TMAGP Tunnel Data Sheet

The following are configuration spaces:

Device

Function

Mnemonic

Registers

 

 

 

 

"A"

0

DevA:0xXX

AGP device header; link and AGP capabilities blocks

 

 

 

 

"B"

0

DevB:0xXX

PCI-PCI bridge registers for AGP

 

 

 

 

Table 3: Configuration spaces.

The IC does not claim configuration-register accesses to unimplemented functions within its devices (they are forwarded to the other side of the tunnel). Accesses to unimplemented register locations within implemented functions are claimed; such writes are ignored and reads always respond with all zeros.

The following are memory mapped spaces:

Base address

Size

Mnemonic

Registers

register

(bytes)

 

 

 

 

 

 

DevA:0x10

Variable

None

Graphic virtual memory aperture; minimum of 32 megabytes.

 

 

 

 

DevA:0xB8

4K

None

GART block in physical memory.

 

 

 

 

Table 4: Memory mapped address spaces.

The following are register attributes found in the register descriptions.

Type

Description

 

 

Read or read-only

Capable of being read by software. Read-only implies that the register cannot be written to by

 

software.

 

 

Write

Capable of being written by software.

 

 

Set by hardware

Register bit is set high by hardware.

 

 

Write once

After RESET#, these registers may be written to once. After being written, they become read only

 

until the next RESET# assertion. The write-once control is byte based. So, for example, software

 

may write each byte of a write-once DWORD as four individual transactions. As each byte is

 

written, that byte becomes read only.

 

 

Write 1 to clear

Software must write a 1 to the bit in order to clear it. Writing a 0 to these bits has no effect.

 

 

Write 1 only

Software can set the bit high by writing a 1 to it. However subsequent writes of 0 will have no

 

effect. RESET# must be asserted in order to clear the bit.

 

 

Table 5: Register attributes.

5.2AGP Device Configuration Registers

These registers are located in PCI configuration space, in the first device (device A), function 0. See section 5.1.2 for a description of the register naming convention.

AGP Vendor And Device ID Register

DevA:0x00

Default: 7454 1022h

Attribute: Read only.

Bits

Description

 

 

 

 

31:16

AGP device ID.

 

 

 

 

15:0

Vendor ID.

 

 

 

 

15

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AMD 8151 specifications Configuration spaces, Memory mapped address spaces, Register attributes
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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.
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