AMD-762 datasheet(94/122 Pages) AMD

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Signal Descriptions

Chapter 7

AMD-762™ System Controller Data Sheet

24416C—December 2001

Preliminary Information

Table 34.

Signal Descriptions

Signal

Type

Description

Processor Interface Signals

CLKFWDRST

AMD Athlon™ Processor System Bus Clock Forward Reset

CLKFWDRST resets the source-synchronous clock circuitry for the processor. Forwarded

clocks are driven continuously beginning three clocks after CLKFWDRST is negated.

This signal is negated by RESET#. It changes on the rising edge of SYSCLK.

CONNECT

AMD Athlon Processor System Bus Connect

CONNECT is an output from the AMD-762™ system controller and is used for power

management and source-synchronous clock initialization at reset.

This signal is negated by RESET#. It changes on the rising edge of SYSCLK.

PROCRDY

AMD Athlon Processor System Bus Connect Processor Ready

PROCRDY is an input to the AMD-762 system controller and is used for power

management and source-synchronous clock initialization at reset.

This signal is sampled on the rising edge of SYSCLK.

SADDIN[14:2]#

AMD Athlon Processor System Bus Connect Address/Command

SADDIN[14:2]# is a unidirectional system command bus to the processor. It is used to

transfer probe and data movement commands into the processor. SADDIN[14:2]# are

skew-aligned with the source-synchronous clock, SADDINCLK#. The AMD-762 system

controller drives the SADDIN[14:2]# channel on each edge of SADDINCLK#.

SADDINCLK#

AMD Athlon Processor System Bus Connect System Address In Clock

SADDINCLK# is the single-ended source-synchronous clock for the SADDIN[14:2]# bus,

driven by the AMD-762 system controller. Each clock edge is used to transfer probe and

data movement commands to the processor.

This signal is driven inactive (negated) when the CLKFWDRST signal is asserted (true).

When CLKFWDRST is negated, SADDINCLK# runs continuously after a three clock delay.

SADDOUT[14:2]#

AMD Athlon Processor System Bus Connect System Address Out

SADDOUT[14:2]# is a unidirectional system address interface from the processor to the

AMD-762 system controller. The SADDOUT[14:2]# channel is used to transfer processor

requests and probe responses to the system. This channel is skew-aligned with the

source-synchronous clock, SADDOUTCLK#. The SADDOUT[14:2]# channel is sampled by

the AMD-762 system controller on each edge of SADDOUTCLK#.

The AMD-762 system controller samples commands driven by the processor on the

SADDOUT[14:2]# channel and forwards them to the PCI bus, AGP bus, or DRAM,

depending on the address range and AMD-762 system controller configuration.

SADDOUTCLK#

AMD Athlon Processor System Bus Connect System Address Out Clock

SADDOUTCLK# is a single-ended source synchronous clock for the SADDOUT[14:2]#

channel driven by the processor. Each edge is used to transfer commands.

This signal is driven inactive (negated) when the CLKFWDRST signal is asserted (true). When

CLKFWDRST is negated, SADDOUTCLK# runs continuously after a three-clock delay.

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