ST486DX ST Microelectronics, ST486DX Datasheet - Page 9

• Manufacturer Part Number: ST486DX
• Description: PROGRAMMING MANUAL
• Manufacturer: ST Microelectronics

Table 2 - 3.
A31
7
Reg. Index = CDh
Table 2 - 4.
0h
1h
2h
3h
4h
5h
6h
7h
Bits 3-0
SMAR
to 1 while in normal mode. If NMIEN = 1 when an SMI occurs, an NMI could
occur before the SMM code has initialized the Interrupt Descriptor Table.
SMAR SIZE FIELD
SMM Address Region Registers
Disable
4 KBytes
8 KBytes
16 KBytes
32 KBytes
64 KBytes
128 KBytes
256 KBytes
A24
BLOCK SIZE
0
A23
7
Base Address
Reg. Index = CEh
8h
9h
Ah
Bh
Ch
Dh
Eh
Fh
Bits 3-0
ST486DX - SMM IMPLEMENTATION
A16
0
A15
7
512 KBytes
1 MBytes
2 MBytes
4 MBytes
8 MBytes
16 MBytes
32 MBytes
4 KBytes
BLOCK SIZE
Reg. Index = CFh
(same as 1h)
A12
4
3
see table below
Size
0
17