microprocessors

问题 As we always know the procedure of executing task by a microprocessor is just executing binary instructions from memory one by one and there is a program counter which holds the address of the next instruction. So this is how processor executes it's tasks if I am not wrong. But there is also another pointer named Stack Pointer which does almost same thing like the program counter. My question is why we need a Stack Pointer to point address of memory(Stack)? Can somebody tell me about the main

来源： https://stackoverflow.com/questions/63002788/how-to-wait-for-characters-from-uart-and-transmit-back-on-the-uart-in-arm-cortex

来源： https://stackoverflow.com/questions/63002788/how-to-wait-for-characters-from-uart-and-transmit-back-on-the-uart-in-arm-cortex

问题 I saw haswell's microarchitecture from below link mentioned that some pipelines can carry on fast LEA and some can run slow LEA, what's the meaning of fast LEA and slow LEA here? Related to LEA instruction? The search results are usually biases to LEA instruction, and don't lead to direct answer. http://www.realworldtech.com/haswell-cpu/4/ 回答1: Most dedicated ALU units exist only on part of the execution ports (with constant changes being made from generation to generation), the CPU has to

问题 I'm having trouble getting UART enabled. I've gone through many different directions on how to enable and troubleshoot from updating the uEnv.txt file to updating the kernel. I've come to conclude that it may be an issue with using a different kernel than the instructions, but I'm not sure? I don't know very much about the Beaglebone and I'm still learning. Whenever I try to test UART by using Python and typing the following: import Adafruit_BBIO.UART as UART UART.setup("UART1") I get the

问题 I'm having trouble getting UART enabled. I've gone through many different directions on how to enable and troubleshoot from updating the uEnv.txt file to updating the kernel. I've come to conclude that it may be an issue with using a different kernel than the instructions, but I'm not sure? I don't know very much about the Beaglebone and I'm still learning. Whenever I try to test UART by using Python and typing the following: import Adafruit_BBIO.UART as UART UART.setup("UART1") I get the

问题 I'm learning to code on Xilinx (VHDL). Next, I want to make a simple microprocessor/microcontroller and on the way learn a little about slice components. So my goal is try to code an 8 bits microprocessor using an AMD 2901 (4 bits-slice). (I already have the code of the 2901 and all its information about its input and output signals.) I know the first step would be make the architecture of the microprocessor so I ended up with something like this (I understand that the bandwidth of the bus

问题 I am getting Error while trying to disable Hardware prefetcher in my Core i7 system. I am following the method as per the link How do I programmatically disable hardware prefetching? In my system grep -i msr /boot/config-$(uname -r) CONFIG_X86_DEBUGCTLMSR=y CONFIG_X86_MSR=y CONFIG_SCSI_ARCMSR=m Here is my error message root@ ./rdmsr 0x1a0 850089 [root@ ./wrmsr -p 0 0x1a0 0x850289 (to disable hardware prefetcher in Core i7) wrmsr:pwrite: Input/output error I am getting same error for disabling

问题 I want to make a program in assembly/8086/masm/dosbox that turns the keyboard into various musical instruments so i need to be able to play some .wav files to produce the required sounds.I am aware of beep char and producing sound via sending frequencies to pc speaker (ports 41h,42h and 61h) but both ways are clearly not going to get me there. I searched around and found that I need to use int 21h for opening files, knowledge of .wav format and knowledge of sound programming using Sound

问题 I want to know the difference between FIQ and IRQ interrupt system in any microprocessor, e.g: ARM926EJ. 回答1: A feature of modern ARM CPUs (and some others). From the patent: A method of performing a fast interrupt in a digital data processor having the capability of handling more than one interrupt is provided. When a fast interrupt request is received a flag is set and the program counter and condition code registers are stored on a stack. At the end of the interrupt servicing routine the