AMD 8151 specifications Tunnel Link Signals

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24888 Rev 3.03 - July 12, 2004

AMD-8151TMAGP Tunnel Data Sheet

3.2Tunnel Link Signals

The following are signals associated with the HyperTransportTM links. [B, A] in the signal names below refer to the A and B sides of the tunnel. [P, N] are the positive and negative sides of differential pairs.

Pin name and description

 

IO cell

Power

During

After

 

 

 

type

plane*

reset

reset

 

 

 

 

 

LDTCOMP[3:0]. Link compensation pins for both sides of the tunnel. These are

Analog

VDD-

 

 

designed to be connected through resistors as follows:

 

12B

 

 

Bit

Function

External Connection

 

 

 

 

[0]

Positive receive compensation Resistor to VDD12B

 

 

 

 

[1]

Negative receive compensationResistor to VSS

 

 

 

 

[3, 2]

Transmit compensation

Resistor from bit [2] to bit [3]

 

 

 

 

These resistors are used by the compensation circuit. The output of this circuit is

 

 

 

 

combined with DevA:0x[E8, E4, E0] to determine compensation values that are

 

 

 

 

passed to the link PHYs.

 

 

 

 

 

 

 

 

 

 

LRACAD_[P, N][15:0]; LRBCAD_[P, N][7:0]. Receive link command-address-

Link

VDD12

 

 

data bus.

 

 

input

 

 

 

 

 

 

 

 

LRACLK[1, 0]_[P, N]; LRBCLK0_[P, N]. Receive link clock.

Link

VDD12

 

 

 

 

 

input

 

 

 

 

 

 

 

 

LR[B, A]CTL_[P, N]. Receive link control signal.

Link

VDD12

 

 

 

 

 

input

 

 

 

 

 

 

 

 

LTACAD_[P, N][15:0]; LTBCAD_[P, N][7:0]. Transmit link command-address-

Link

VDD12

Diff

Func.

data bus.

 

 

output

 

High**

 

 

 

 

 

 

LTACLK[1, 0]_[P, N]; LTBCLK0_[P, N]. Transmit link clock.

Link

VDD12

Func.

Func.

 

 

 

output

 

 

 

 

 

 

 

 

LT[B, A]CTL_[P, N]. Transmit link control signal.

Link

VDD12

Diff

Func.

 

 

 

output

 

Low**

 

 

 

 

 

 

 

 

*The signals connected to the A side of the tunnel are powered by VDD12A and the signals connected to the B side of the tunnel are powered by VDD12B.

** Diff High and Diff Low for these link pins specifies differential high and low; e.g., Diff High specifies that the _P signal is high and the _N signal is low.

If one of the sides of the tunnel is not used on a platform then the unconnected link should be treated as fol- lows, for every 10 differential pairs: connect all of the _P differential inputs together and through a resistor to VSS; connect all the _N differential inputs together and through a resistor to VDD12; leave the differential out- puts unconnected. If there are unused link signals on an active link (because the IC is connected to a device with a reduced bit width), then the unused differential inputs and outputs should also be connected in this way.

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Contents AMD-8151TMDevice Device FeaturesOverview CoverAMD-8151 TM AGP Tunnel Data Sheet Table of Contents Rev 3.03 July 12 System block diagram Configuration space Ball designationsList of Tables IO signal types Tunnel Link Signals ACALD, S and ACALD, S#. Compensation pins for AGP SignalsSERR# and PERR# signals are not supported on the AGP bridge Power and Ground Test and Miscellaneous SignalsPower Plane Sequencing Clock Gating Reset And InitializationFunctional Operation Overview ClockingTags, UnitIDs, And Ordering Tunnel LinksLink PHY AGPAGP Compensation And Calibration Cycles Translation from AGP requests to link requestsAGP transaction Link transaction Various BehaviorsAGP Device AGP Bridge Configuration SpaceRegisters Register Overview Register Naming and Description ConventionsMemory mapped address spaces Configuration spacesRegister attributes REVISION. Read only AGP Device Status And Command Register DevA0x04RESET# AGP Device Revision and Class Code Register DevA0x08AGP Capabilities Pointer Default 0000 0000h Attribute Read write onceDefault 0000 00A0h Attribute Read only AGP Device Subsystem ID and Subsystem Vendor ID Register24888 Rev 3.03 July 12 Default 0000 0000h Attribute See belowAGP Miscellaneous Control Register DevA0x40 Nctl 1Fh, then 1Fh is applied 11b Updated by the hardware approximately every 8 microseconds1514 PctlHost translation#. This bit fixed low AGP Revision and Capability RegisterAGP Status Register Bit Gart support. This bit fixed lowPcalcyc and then DevA0xB0CALDIS should be cleared afterward AGP Command RegisterDefault 0000 0000h Attribute Read-write RatesAGP Aperture Size Register Default 0001 0F00h Attribute See belowAGP3MD Drate AGP Control RegisterSlave/primary interface type. Read only Link Command RegisterGarthi Gart base address register high Gartlo Gart base address register lowLink Configuration And Control Register Rev 3.03 July 12 Link Frequency Capability 1 Register DevA0xD0 Link Frequency Capability 0 Register DevA0xCCLink Enumeration Scratchpad Register DevA0xD4 Behavior 3021 Reserved 2016 Default See below Attribute See belowBctl Must be high. See .3.1 for details ActlSum exceeds 1Fh, then 1Fh is applied 11b Clock Control RegisterAGP Bridge Revision and Class Code Register DevB0x08 AGP Bridge Configuration RegistersAGP Bridge Status And Command Register DevB0x04 AGP Bridge Vendor And Device ID Register DevB0x00AGP Bridge Memory Base-Limit Registers DevB0x301C 3130 Reserved Default 0000 00FFh Attribute See below DevB0x24. Default 0000 FFF0h Attribute Read-writeDevB0x3C Operating Ranges Absolute maximum ratingsOperating ranges Electrical Data Absolute RatingsSymbol Parameter Description Min Max Units Comments Current and power consumptionDC characteristics for signals on the VDD33 power plane DC CharacteristicsInput high voltage VDD15 + VDD15 AC data for clocks AC data for common clock operation of AGP signalsAC Characteristics Symbol Parameter Description Min Max UnitsAGP AC data for clock-forwarded operation of AGP signalsTop side view Ball DesignationsSignal name Ball Signal BGA positionsSignal Ball Name Power and ground BGA positionsPackage mechanical drawing Package SpecificationTest High Impedance ModeNand Tree Mode Test modesNand tree 2 output signal is STRAPL4 Revision Appendix Revision History

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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