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Figure 6-14, Audio smi tree example – AMD Geode SC1201 User Manual

Page 172

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172

AMD Geode™ SC1200/SC1201 Processor Data Book

Core Logic Module

32579B

In Fast Path Write, the Core Logic module responds to
writes to the following addresses: 388h, 38Ah, 38Bh, 2x0h,
2x2h, and 2x8h

Table 6-38 on page 263 shows the bit formats of the sec-
ond level SMI status reporting registers and the Fast Path
Read/Write programming bits.

Figure 6-14. Audio SMI Tree Example

SMI# Asserted

SMM software reads SMI Header

If Bit X = 0
(Internal SMI)

If Bit X = 1

(External SMI)

Call internal SMI handler
to take appropriate action

GX1

Core Logic Module

F1BAR0+Memory

Read to Clear

to determine

top-level source

of SMI

F3BAR0+Memory

Offset 10h

Read to Clear

SMI de-asserted after all SMI Sources are Cleared

Bit 7

ABM5_SMI

Bits [15:2]

Bit 0

Bit 1

AUDIO_SMI

Offset 02h

Module

to determine
second-level

source of SMI

Bits [15:8]

Bit 6

ABM4_SMI

Bit 5

ABM3_SMI

Bit 4

ABM2_SMI

Bit 3

ABM1_SMI

Bit 2

ABM0_SMI

Bit 1

SER_INTR_SMI

Bit 0

I/O_TRAP_SMI

F3BAR0+Memory

Offset 14h

Read to Clear

to determine

third-level

source of SMI

Bit 13

SMI_SC/FM_TRAP

Bits [31:14]

Bit 12

SMI_DMA_TRAP

Bit 11

SMI_MPU_TRAP

Bit 10

SMI_SC/FM_TRAP

Bits [9:0]

(i.e., Top, Second, and Third Levels)

Take
Appropriate
Action

Take
Appropriate
Action

Other_SMI

Other_SMI

RSVD

Other_RO

Other_RO

Top Level

Second Level

Third Level

If bit 1 = 1,
Source of
SMI is

If bit 0 = 1,
Source of
SMI is
I/O Trap

Audio Event

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