产品介绍
a73 Static Intel386™ CPU Core
—Low Power Consumption
—Operating Power Supply
EXTB: 2.7 V to 3.6 V
EXTC: 4.5 V to 5.5 V
—Operating Frequency
20 MHz EXTB at 2.7 V to 3.6 V
25 MHz EXTB at 3.0 V to 3.6 V;
25/33 MHz EXTC at 4.5 V to 5.5 V
a73 Transparent Power-management System
Architecture
—Intel System Management Mode
Architecture Extension for Truly
Compatible Systems
—Power Management Transparent to
Operating Systems and Application
Programs
—Programmable Power-management
Modes
a73 Powerdown Mode
—Clock Stopping at Any Time
—Only 10–20 µA Typical CPU Sink
Current
a73 Full 32-bit Internal Architecture
—8-, 16-, 32-bit Data Types
—8 General Purpose 32-bit Registers
a73 Runs Intel386 Architecture Software in a
Cost-effective 16-bit Hardware
Environment
—Runs Same Applications and Operating
Systems as the Intel386 SX and Intel386
DX Processors
—Object Code Compatible with 8086,
80186, 80286, and Intel386 Processors
a73 High-performance 16-bit Data Bus
—Two-clock Bus Cycles
—Address Pipelining Allows Use of
Slower, Inexpensive Memories
a73 Extended Temperature Range
a73 Integrated Memory Management Unit
—Virtual Memory Support
—Optional On-chip Paging
—4 Levels of Hardware-enforced
Protection
—MMU Fully Compatible with MMUs of
the 80286 and Intel386 DX Processors
a73 Virtual 8086 Mode Allows Execution of
8086 Software in a Protected and Paged
System
a73 Large Uniform Address Space
—64 Megabyte Physical
—64 Terabyte Virtual
—4 Gigabyte Maximum Segment Size
a73 On-chip Debugging Support Including
Breakpoint Registers
a73 Complete System Development Support
a73 High CHMOS Technology
a73 Two Package Types
—132-pin Plastic Quad Flatpack
—144-pin Thin Quad Flatpack
a73 Integrated Peripheral Functions
—Clock and Power Management Unit
—Chip-select Unit
—Interrupt Control Unit
—Timer/Counter Unit
—Watchdog Timer Unit
—Asynchronous Serial I/O Unit
—Synchronous Serial I/O Unit
—Parallel I/O Unit
—DMA and Bus Arbiter Unit
—Refresh Control Unit
—JTAG-compliant Test-logic Unit
