A80386DX16 Intel, A80386DX16 Datasheet - Page 57

• Manufacturer Part Number: A80386DX16
• Description: IC MPU 32-BIT 5V 16MHZ 132-PGA
• Manufacturer: Intel

Specifications of A80386DX16

• Processor Type: 386DX
• Features: 32-bit
• Speed: 16MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-PGA
• Family Name: Intel386 DX
• Device Core Size: 32b
• Frequency (max): 16MHz
• Supply Voltage 1 (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 132
• Package Type: PGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 807050

erating system code between multiple 8086 applica-
tions Figure 4-24 shows how the Intel386 DX paging
hardware enables multiple 8086 programs to run un-
der a virtual memory demand paged system
4 6 4 Protection and I O Permission
All Virtual 8086 Mode programs execute at privilege
level 3 the level of least privilege As such Virtual
8086 Mode programs are subject to all of the protec-
tion checks defined in Protected Mode (This is dif-
ferent from Real Mode which implicitly is executing
at privilege level 0 the level of greatest privilege )
Thus an attempt to execute a privileged instruction
when in Virtual 8086 Mode will cause an exception
13 fault
The following are privileged instructions which may
be executed only at Privilege Level 0 Therefore at-
tempting to execute these instructions in Virtual
8086 Mode (or anytime CPL
tion 13 fault
LIDT
LGDT
Bitmap
MOV DRn reg
MOV TRn reg
Figure 4-24 Virtual 8086 Environment Memory Management
l
0) causes an excep-
MOV reg DRn
MOV reg TRn
Several instructions particularly those applying to
the multitasking model and protection model are
available only in Protected Mode Therefore at-
tempting to execute the following instructions in
Real Mode or in Virtual 8086 Mode generates an
exception 6 fault
The instructions which are IOPL-sensitive in Protect-
ed Mode are
LMSW
CLTS
HLT
LTR
LLDT
LAR
LSL
ARPL
IN
OUT
INS
OUTS
REP INS
REP OUTS
Intel386
MOV CRn reg
STR
SLDT
VERR
VERW
STI
CLI
TM
DX MICROPROCESSOR
MOV reg CRn
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