CS5535-UDC datasheet(99/555 Pages) NSC

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DIVIL Functional Description (Continued)

4.6.1.4

Miscellaneous Block

Special cycles are sent to the Miscellaneous block. They

are decoded as given in Table 4-10. Note that the Halt spe-

cial cycle depends on the value of the SPEC_CYC_MD bit

in MSR_LEG_IO (MSR 51400014h[28]).

Soft IRQ and Soft Reset MSRs are decoded within the Mis-

cellaneous block.

Each block in the Diverse Device generates an output to

the DIVIL. The DIVIL DOM has a port for each of the func-

tions and is responsible for selecting between them.

4.6.2

Standard MSRs

This block contains the Standard GeodeLink Device MSRs

and their associated logic. These standard MSRs are:

Capabilities, Master Configuration, SMI Control, Error Con-

trol, Power Management, and Diagnostics. The Capabili-

ties, Master Configuration, and Diagnostic MSRs are

“passive” in that they contain values that have an effect

elsewhere. The other MSRs have various “active” bits that

are set and cleared via hardware/software interactions.

Table 4-10. Special Cycle Decodes

Cycle Type

Address

Function

Action

Write

00h

Shutdown

Send shutdown pulse to MSR_ERROR.

Send shutdown pulse to MSR_SMI.

If RESET_SHUT_EN (MSR 51400014h[31]) is high, send reset

pulse to power management indicating shutdown reset.

SPEC_CYC_MD (MSR 51400014h[28]) = 0

Write

01h

Halt

Send halt pulse to MSR_SMI.

SPEC_CYC_MD (MSR 51400014h[28]) = 1

Write

02h

Halt

Send halt pulse to MSR_SMI.

All other values

x86 Special

Discard with no side effects.

All other values

Not Defined

Discard with no side effects.

Read

00h

Interrupt Ack

Send cycle to PIC.

GeodeLink Adapter generates back-to-back bus cycles.

All other values

Not Defined

Return zero with no side effects.

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