How does 8087 handle the case to communicate 8086 when it needs more words to read or write from memory?
Table of Contents
- 1 How does 8087 handle the case to communicate 8086 when it needs more words to read or write from memory?
- 2 Which of the following instructions places the address and data bus in the high impedance state?
- 3 What the feature is not true about 8086 microprocessor?
- 4 What is the difference between 8087 and 8088?
- 5 How many segments are there in 8086 microcontroller?
How does 8087 handle the case to communicate 8086 when it needs more words to read or write from memory?
During execution, if 8087 needs to read/ write more words from the memory, then it does so by stealing bus cycles from the microprocessor in the following manner. If 8086 requires the result of the 8087 operation, it first executes the WAIT instruction.
What information appears on the bus system of the 8086 microprocessor when ALE pin is made active in logic 1 and logic 0?
ALE : Address Latch Enable. ALE is provided by the microprocessor to latch the address into the 8282 or 8283 address latch. It is an active high(1) pulse during T1 of any bus cycle. ALE signal is never floated, is always integer….Pin diagram of 8086 microprocessor.
| A17/S4 | A16/S3 | Function |
|---|---|---|
| 1 | 0 | Code segment access |
| 1 | 1 | Data segment access |
How the 8086 8088 microprocessor accesses data in the memory RAM?
The 8088 and 8086 used segmented addressing to allow these chips to address 1 MB of memory using 20 address bits = 1,048,576). They used 16-bit segment registers to derive the actual memory address.
Which of the following instructions places the address and data bus in the high impedance state?
8086/88 Pinout. Requests a direct memory access (DMA). When 1, microprocessor stops and places address, data and control bus in high-impedance state.
How 8087 determines that the incoming instruction is meant for it?
Because the 8086 and 8088 prefetch queues have different sizes and different management algorithms, the 8087 determines which type of CPU it is attached to by observing a certain CPU bus line when the system is reset, and the 8087 adjusts its internal instruction queue accordingly.
When execution unit of 8087 start executing instruction it indicates this with the signal?
When the NEU begins executing an instruction, it activates the 8087 BUSY signal indicates 8087 is busy.
What the feature is not true about 8086 microprocessor?
In 8086 microprocessor one of the following statements is not true? coprocessor is interfaced in max mode. coprocessor is interfaced in min mode. I /O can be interfaced in max / min mode.
What is the reason CLK is connected to 8288 bus controller?
IOB: High on the I/O Bus input operates the 8288 in the I/O bus mode in systems where there are separate system bus and I/O bus. CLK: The Clock input. DEN: The Data bus Enable signal controls the data bus buffers in the system. This signal is active-high in contrast to the DEN signal in the minimum mode.
Which of the following 8086 signal is used to Demultiplex address and data lines?
Address Bus: – The 8086 CPU is has 20-bit address bus, where the AD0-AD15 and A16-A20 are used as the address bus. To demultiplex the address signals from the address/data pins (AD0-AD15) a latch must be used to grab the addresses.
What is the difference between 8087 and 8088?
The 8086 and 8088 have two queue status signals connected to the coprocessor to allow it to synchronize with the CPU’s internal timing of execution of instructions from its prefetch queue. The 8087 maintains its own identical prefetch queue, from which it reads the coprocessor opcodes that it actually executes.
What are the most prominent features of 8087 numeric data processor?
The most prominent features of 8087 numeric data processor are as follows − It supports data of type integer, float, and real types ranging from 2-10 bytes. The processing speed is so high that it can calculate multiplication of two 64-bits real numbers in ~27 µs and can also calculate square-root in ~35 µs.
What are S0 S1 and S2 signals in 8087?
S0, S1, S2 − These are the status signals that provide the status of the operation which is used by the Bus Controller 8087 to generate memory and I/O control signals. These signals are active during the fourth clock cycle.
How many segments are there in 8086 microcontroller?
•4 Segments in 8086 –Code Segment (CS) –Data Segment (DS) –Stack Segment (SS) –Extra Segment (ES) Prof.Ms.Aaradhana A. Deshmukh, SKNCOE, Comp SEGMENT SEGMENT REGISTER OFFSET REGISTER Code Segment CSR Instruction Pointer (IP) Data Segment DSR Source Index (SI) Extra Segment ESR Destination Index (DI)