8086. 8087. I7. 1. The instruction Queue is 6 byte long. It is a 32 bit microprocessor and it is logical extension of the 80236. 64 bit: 2. In 8086 memory divides into two banks, up to 1,048,576 bytes: It is highly pipelined architecture and much faster speed bus than 8086. 32/64 bit Address bus: 3. The data bus of 8086 is 16-bit wide
Microprocessor - 8086 Instruction Sets - The 8086 microprocessor supports 8 types of instructions − Latches are generally buffered output D-type flip-flops like 74LS373 or 8282. They are used for separating the valid address from the multiplexed address/data signals and are controlled by the ALE signal generated by 8086. Transreceivers are the bidirectional buffers and some times they are called as data amplifiers. • In a large system, the buses must be buffered because the 8086/8088 microprocessors are capable of driving only 10 unit loads, and large systems often have many more. ( cont. ) SUMMARY • Bus timing is very important to the remaining chapters in the text. The 8086 Hardware Specifications The 8086 was the first 16-bit microprocessor introduced by Intel Corporation in 1978. The 8086 is manufactured using high-performance metal-oxide semiconductor (HMOS) technology, and the circuitry on their chips is equivalent to approximately 29,000 transistors. • The buses are buffered for very large systems because the maximum fan-out is 10, the system must be buffered if it contains more than 10 other components Demultiplexing the Buses • The address/data bus of the 8086 is multiplexed (shared) to reduce the number of pins required for the integrated circuit • Memory & I/O require the address
8086/8088 Hardware Specifications A Course in Microprocessor Electrical Engineering Dept. University of Indonesia
S. No. 8086 microprocessor 8088 microprocessor; 1: The data bus is of 16 bits. The data bus is of 8 bits. 2: It has 3 available clock speeds (5 MHz, 8 MHz (8086-2) and 10 MHz (8086-1)). Aug 07, 2014 · 18 9-3 Bus Buffering and Latching • Demultiplexing the 8086 : Fig. 9-6 – demultiplexing: AD15-AD0, A19/S6-A16/S3, BHE’/S3 – 3 buses : address(A19-A0, BHE’), data(D15-D0), control(M/IO’, RD’,WR’) – three 74LS373 transparent latches • The Buffered System – µ system must be buffered : if more than 10 unit load are attached
Microprocessor - 8086 Instruction Sets - The 8086 microprocessor supports 8 types of instructions −
A fully buffered 8086 Control Address Data. Title: Microprocessor Systems Author: James Green, PhD Created Date: 7/14/2014 12:09:38 PM A buffer allows a signal to drive more inputs than it would by itself, or provides input protection / amplification. For the 8086, it's used in the output sense, allowing internal signals to be made robust to drive external devices. A latch is a circuit to accept and store one or more bits, with a 1-to-1 input / output ratio. That is, it's not RAM. Figure 2 shows a fully buffered 8086 microprocessor. Its address pins are buffered by 74LS373 address latched. Its data bus employs two 74LS245 buffer and the control bus signals use 74LS245 buffer. A fully buffered 8086 system requires one 74LS244, two 74LS245, and three 74LS373s.