8087 COPROCESSOR PDF

An is along with the host microprocessor rather than serving as the main processor itself. Therefore, it is referred to as the coprocessor. An instruction may perform a given mathematical computation times faster than the equivalent sequence of instructions. Instructions for are written in the program as needed, interspersed with instructions. As the fetches instruction bytes from the memory and puts them in its queue, the also reads these instruction bytes and puts them in its queue. The decodes each instruction that comes into its queue.

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An is along with the host microprocessor rather than serving as the main processor itself. Therefore, it is referred to as the coprocessor. An instruction may perform a given mathematical computation times faster than the equivalent sequence of instructions. Instructions for are written in the program as needed, interspersed with instructions. As the fetches instruction bytes from the memory and puts them in its queue, the also reads these instruction bytes and puts them in its queue.

The decodes each instruction that comes into its queue. When decodes an instruction from its queue and finds that it is an instruction, the simply treats the instruction as NOP. Likewise, when the decodes an instruction from its queue and finds that it is an instruction, the simply treats the instruction as NOP or in some cases reads a data word from the memory for the Each processor decodes all instructions in the fetched instruction byte stream but executes only its own instructions.

Interfacing of with As a coprocessor is connected to , operates in maximum mode. This interface is also called as coprocessor configuration.

Here is called as the host and as coprocessor as it cannot operate all by itself. We write a homogeneous program which contains both as well as instructions. Only can fetch instructions but these instructions also enter ESC is used as a prefix for instructions. The ESC instruction is decoded by both and If the instruction has only an opcode no operands then will start execution and will immediately move its next instruction. But if the instruction requires a memory operand, then will have to fetch the first word of the operand as cannot calculate the physical address.

This word will be captured by Now the remaining words for a large operand can be fetched by by simply incrementing the address of the first word. Thus need help from Once gets its operand, it begins processing by making the BUSY output high. Now execute its instruction and moves ahead with its next instruction. Hence multiprocessing takes place. If requires the result of the operation, it first executes the WAIT instruction. It comes out of it only when TEST is low has finished its execution.

Thus get the correct result of an operation. During the execution if an exception occurs, which is unmasked, interrupts microprocessor using the INT output pin through the PIC

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Coprocessor

In that architecture, the coprocessor speeds up floating-point arithmetic on the order of fiftyfold. Users that only used the PC for word processing, for example, saved the high cost of the coprocessor, which would not have accelerated performance of text manipulation operations. An processor without an could not interpret these instructions, requiring separate versions of programs for FPU and non-FPU systems, or at least a test at run time to detect the FPU and select appropriate mathematical library functions. The Intel microprocessor used an optional "math" coprocessor the to perform floating point operations directly in hardware. The Intel DX processor included floating-point hardware on the chip. Intel released a cost-reduced processor, the SX, that had no floating point hardware, and also sold an SX coprocessor that essentially disabled the main processor when installed, since the SX was a complete DX with a different set of pin connections.

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