AMD Geode SC2200 - Manual (Page 172)

180 AMD Geode™ SC2200 Processor Data Book
Core Logic Module 32580B
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 F3BAR0+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 Core Logic module responds to
writes to the following addresses:
388h, 38Ah, 38Bh, 2x0h, 2x2h, and 2x8h
Table 6-38 on page 273 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