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A wait state is a delay experienced by a computer processor when accessing external memory or another device that is slow to respond. Computer microprocessors generally run much faster than the computer's other subsystems, which hold the data the CPU reads and writes.
Some of the first 100 MHz DX chips had a buggy HLT state, prompting the developers of Linux to implement a "no-hlt" option for use when running on those chips, [4] but this was fixed in later chips. Intel has since introduced additional processor-yielding instructions. These include: PAUSE in SSE2 intended for spin loops. Available to userspace ...
The Intel 8085 ("eighty-eighty-five") is an 8-bit microprocessor produced by Intel and introduced in March 1976. [2] It is the last 8-bit microprocessor developed by Intel. It is software-binary compatible with the more-famous Intel 8080 with only two minor instructions added to support its added interrupt and serial input/output features.
In computer architecture, a control bus is part of the system bus and is used by CPUs for communicating with other devices within the computer. While the address bus carries the information about the device with which the CPU is communicating and the data bus carries the actual data being processed, the control bus carries commands from the CPU and returns status signals from the devices.
Fetching the instruction opcodes from program memory well in advance is known as prefetching and it is served by using a prefetch input queue (PIQ). The pre-fetched instructions are stored in a queue.
Intel 8080, Intel 8085, Z80: NOP: 1 0x00 DEC Alpha: NOP: 4 0x47FF041F Opcode for BIS r31,r31,r31, an instruction that bitwise-ORs the always-0 register with itself. AMD 29k: NOP: 4 0x70400101 Opcode for aseq 0x40,gr1,gr1, an instruction that asserts that the stack register is equal to itself. [3] ARM A32: NOP: 4 0x00000000 This stands for andeq ...
The program status word [a] (PSW) is a register that performs the function of a status register and program counter, and sometimes more.The term is also applied to a copy of the PSW in storage.
In computer engineering, instruction pipelining is a technique for implementing instruction-level parallelism within a single processor. Pipelining attempts to keep every part of the processor busy with some instruction by dividing incoming instructions into a series of sequential steps (the eponymous "pipeline") performed by different processor units with different parts of instructions ...