What are the features of 80386 microprocessor?
Features of 80386
- As it is a 32-bit microprocessor.
- 80386 has a data bus of 32-bit.
- It holds an address bus of 32 bit.
- It supports physical memory addressability of 4 GB and virtual memory addressability of 64 TB.
- 80386 supports a variety of operating clock frequencies, which are 16 MHz, 20 MHz, 25 MHz, and 33 MHz.
What are the special features of 80286?
80286 has some extra instructions to support operating system and memory management. In real address mode, the 80286 is object code compatible with 8086. In protected virtual address mode, it is source code compatible with 8086. The performance of 80286 is five times faster than the standard 8086.
What are the various operating modes of 80386?
The 80386 has three processing modes: Protected Mode. Real-Address Mode. Virtual 8086 Mode.
Which are the three sections of 80386?
Explanation: The internal architecture of 80386 is divided into three sections namely, central processing unit, memory management unit and bus interface unit. Explanation: The central processing unit is further divided into the execution unit and instruction unit.
What are the flags in 80386?
The Intel 80386, part 3: Flags and condition codes
| Flag | Clear/Set | Meaning |
|---|---|---|
| OF | nv/ov | Overflow |
| DF | up/dn | Direction |
| SF | pl/ng | Sign |
| IF | ei/di | Interrupts |
How are the main memory of 80386 and Pentium processors segmented?
Notice the limit the 80286 has a 16-bit limit and the 80386 through the Pentium II have a 20-bit limit. The 80286 accesses memory segments that are between 1 and 64K bytes in length. The 80386 and above access memory segments that are between 1 and 1 M byte, or 4K and 4G bytes in length.
What are the two modes of 80286?
Which are the two modes of 80286? Explanation: It possess two modes which are called real and protected modes.
What is paging in 80386?
Paging Unit: The paging unit of 80386 uses a two level table mechanism to convert a linear address provided by segmentation unit into physical addresses. The paging unit converts the complete map of a task into pages, each of size 4K. The task is further handled in terms of its page, rather than segments.
What is paging mechanism in 80386?
What are the advantages of paging and segmentation in 80386?
Segmentation unit allows the use of two address components, viz. segment and offset for relocability and sharing of code and data. Segmentation unit allows segments of size 4Gbytes at max. The Paging unit organizes the physical memory in terms of pages of 4kbytes size each.
What is granularity bit in a 80386 descriptor?
Granularity bit: Specifies the units with which the LIMIT field is interpreted. When thebit is clear, the limit is interpreted in units of one byte; when set, the limit is interpreted in units of 4 Kilobytes.
Which is a 16 bit register of 80386 processor?
AX represents the lower 16 bit of the 32 bit register EAX. BP, SP, SI, DI represents the lower 16 bit of their 32 bit counterparts, and can be used as independent 16 bit registers. The six segment registers available in 80386 are CS, SS, DS, ES, FS and GS.
What are the features of the 80386 microprocessor?
It has a data and address bus of 32-bit each. Thus has the ability to address 4 GB (or 2 32) of physical memory. Multitasking and protection capability are the two key characteristics of the 80386 microprocessor. 80386 has internal dedicated hardware that permits multitasking.
What are the three processing modes of the 80386?
The processing mode of the 80386 also determines the features that are accessible. The 80386 has three processing modes: Protected Mode. Real-Address Mode. Virtual 8086 Mode. Protected mode is the natural 32-bit environment of the 80386 processor.
When to use real mode on the 80386?
Real-address mode (often called just “real mode”) is the mode of the processor immediately after RESET. In real mode the 80386 appears to programmers as a fast 8086 with some new instructions. Most applications of the 80386 will use real mode for initialization only.
When did the Intel 80386 processor come out?
The Intel 80386 is a microprocessor which was used as the Central Processing Unit ( CPU) of many personal computers from 1986 until 1994 and later. During its design phase,, the processor was code-named simply ” P3 “, the third-generation processor in the x86 line, but was, and is stil frequently, referred to as the i386.