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Datasheet

Features

6.1

Power-On Configuration Options

Several configuration options can be configured by hardware. The processor samples

the hardware configuration at reset, on the active-to-inactive transition of RESET#. For

specifications on these options, refer to Table 32.

The sampled information configures the processor for subsequent operation. These

configuration options cannot be changed except by another reset. All resets reconfigure

the processor; for reset purposes, the processor does not distinguish between a

"warm" reset and a "power-on" reset.

Frequency determination functionality will exist on engineering sample processors

which means that samples can run at varied frequencies. Production material will have

the bus to core ratio locked and can only be operated at the rated frequency.

NOTE:

Asserting this signal during RESET# will select the corresponding option.

Address signals not identified in this table as configuration options should not be asserted

during RESET#.

6.2

Clock Control and Low Power States

The processor allows the use of AutoHALT and Stop-Grant states which may reduce

power consumption by stopping the clock to internal sections of the processor,

depending on each particular state. See Figure 22 for a visual representation of the

processor low power states.

Table 32.

Power-On Configuration Option Signals

Configuration Option

Signal1,2

Output tristate

SMI#

Execute BIST

A3#

Disable dynamic bus parking

A25#

Symmetric agent arbitration ID

BR0#

RESERVED

A[8:4]#, A[24:11]#, A[35:26]#

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