SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 174

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

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Core Logic Module
GX1
Module
Core Logic
Module
SMI# Asserted
Figure 5-11. General Purpose Timer and UDEF Trap SMI Tree Example
GTMR_TRP_SMI
top-level source
Read to Clear
to determine
F1BAR0+I/O
Top Level
Bits [15:10]
Offset 02h
Other_SMI
Other_SMI
Bits [8:0]
of SMI
Bit 9
(Continued)
(External SMI)
If Bit X = 1
If bit 9 = 1,
Source of SMI
is GP Timer or UDEF Trap
SMM software reads SMI Header
SMI Deasserted after all SMI Sources are Cleared
(i.e., Top and Second Levels - note some sources may have a Third Level)
174
If Bit X = 0
(Internal SMI)
UDEF3_TRP_SMI
UDEF2_TRP_SMI
UDEF1_TRP_SMI
PCI_TRP_SMI
Second Level
Read to Clear
source of SMI
F1BAR0+I/O
to determine
second-level
GPT2_SMI
GPT1_SMI
Offset 06h
Bits [15:6]
RSVD
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Call internal SMI handler
to take appropriate action
Take
Appropriate
Action
Revision 3.0