24888 Rev 3.03 - July 12, 2004

AMD-8151TMAGP Tunnel Data Sheet

DevB:0x24. Default: 0000 FFF0h

Attribute: Read-write.

Bits

Description

 

 

 

31:20

PMEMLIM. Prefetchable memory limit address bits[31:20]. See DevB:0x[30:1C] above.

 

 

 

19:16

Reserved.

 

 

 

15:4

PMEMBASE. Prefetchable memory base address bits[31:20]. See DevB:0x[30:1C] above.

 

 

 

3:0

Reserved.

 

 

 

 

DevB:0x30. Default: 0000 FFFFh

Attribute: Read-write.

Bits

Description

 

 

 

31:16

IOLIM. IO limit address bits[31:16]. See DevB:0x[30:1C] above.

 

 

15:0

IOBASE. IO base address bits[31:16]. See DevB:0x[30:1C] above.

 

 

 

AGP Bridge Interrupt and Bridge Control Register

DevB:0x3C

 

 

 

Default: 0000 00FFh

Attribute: See below.

Bits

Description

 

 

 

 

31:23

Reserved.

 

22SBRST: AGP bus reset. Read-write. 1=A_RESET# asserted; AGP bus placed into reset state. 0=A_RESET# not asserted.

21:20 Reserved.

19VGAEN: VGA decoding enable. Read-write. 1=Host-initiated commands targeting VGA- compatible address ranges are routed to the AGP bus. These include memory accesses from A0000h to BFFFFh (within the bottom megabyte of memory space only), IO accesses in which address bits[9:0] range from 3B0h to 3BBh or 3C0h to 3DFh (address bits[15:10] are not decoded, regardless of DevB:0x3C[ISAEN]; also this only applies to the first 64K of IO space; i.e., address bits[31:16] must be low). 0=The IC does not decode VGA-compatible address ranges.

18ISAEN: ISA decoding enable. Read-write. 1=The IO address window specified by DevB:0x1C[15:0] and DevB:0x30 is limited to the first 256 bytes of each 1K byte block specified; this only applies to the first 64K bytes of IO space. 0=The PCI IO window is the whole range specified by DevB:0x1C[15:0] and DevB:0x30.

17:16

Reserved.

15:8

INTERRUPT_PIN. Read; write once. These bits control no internal logic.

 

 

7:0

INTERRUPT_LINE. Read-write. These bits control no internal logic.

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AMD 8151 specifications DevB0x24. Default 0000 FFF0h Attribute Read-write, DevB0x3C, Default 0000 00FFh Attribute See below
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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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