CS5530 datasheet(121/241 Pages) NSC

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Functional Description (Continued)

Fast Path Write captures the data and address bit 1 (A1)

of the first access, but does not generate an SMI. A1 is

stored in F3BAR+Memory Offset 14h[15]. The second

access causes an SMI, and the data and address are

captured as in a normal trapped I/O.

In Fast Path Write, the CS5530 responds to writes to the

following addresses:

388h, 38Ah and 38B

2x0h, 2x2h, and 2x8h

Table 3-66 and Table 3-67 show the bit formats of the sec-

ond and third level SMI status reporting registers, respec-

tively. Table 3-68 shows the sound card I/O trap and Fast

Path Read/Write programming bits.

Figure 3-22. 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

Geode™ GXLV

Geode™ CS5530

F1BAR+Memory

Read to Clear

to determine

top-level source

of SMI

F3BAR+Memory

Offset 10h

Read to Clear

SMI Deasserted after all SMI Sources are Cleared

Bit 7

ABM5_SMI

Bits [15:2]

Bit 0

Bit 1

AUDIO_SMI

Offset 02h

Processor

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

F3BAR+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

Bit [9:0]

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

Take

Appropriate

Action

Take

Appropriate

Action

Other_SMI

RSVD

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

I/O Companion

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