terabyte of ram

In the structure of the computer, there is a very important part, is the memory. Memory is used to store programs and data of the parts, for the computer, with memory, only memory function, to ensure normal work. There are many kinds of memory, according to its use can be divided into main memory and auxiliary memory, main memory also called internal memory (memory, RTHK called memory). Memory is also called main storage, is the CPU can directly address the memory space, made of semiconduc

1.DMA Channel The DMA(Direct Memory access) channel is built between the device and RAM, andDMAC(DMA controler) interacts with the device I/O controller to implement data transfer. In the PC, the DMA controller is on the South Bridge on the motherboard that is responsible for managing the I/O bus. A typical PC architecture data channel diagram is as follows: DMAC(DMA Controller) Once activated by the CPU, it can transmit data on its own . In the

controller, and at the end of the DMA transfer, the DMA controller should immediately put the bus control back to the CPU. A complete DMA transfer process must go through the following 4 steps. 1.DMA Request The CPU initializes the DMA controller and emits an operation command to the I/O interface, which makes a DMA request. 2.DMA Response The DMA controller prioritizes and masks the DMA request, and presents the bus request to the bus decision logic. When the CPU is finished executing the cu

Original address: http://blog.chinaunix.net/xmlrpc.php?r=blog/articleuid=27717694id=3595123 First, memory disk INITRD (INITial Ram disk) technologyIn the Linux operating system, there is a special feature-Initialize the memory disk INITRD (INITial Ram disk) technology, and the kernel supports compressed file system images. With these two features, we can start the Linux system from a small initialization m

official recommendations.3. Oracle's official proposed swap setting standardFor an operating system running Oracle database, Oracle has a set size recommendation, as an example of the recommended size extracted from Oracle 12C R1 official Documentation: 4.3.4 Server Memory Minimum RequirementsEnsure that your system meets the following memory requirements:Minimum : 1 GB of RAMRecommended : 2 GB of RAM or moreTable 4-3 describes the relat

, modified the LCD interface according to the purchased LCD, and can be directly connected using the fpccable. It's a great job. Do you want to play.Of course, you can do it with a strategy. For example, you can keep the ram, Rom, and network in the same way as a ready-made board, so that you can use their information directly, leave yourself a retreat. Others, such as SD, do what they do. Reached ~~ It is money and time.Then, I would like to give som

Document directory SRAM DRAM Prom EPROM EEPROM I recently used several types of memory, but it will always be mixed up. So I found the characteristics of various types of memory on the Internet and sorted it out for future use. Memory by purpose can be divided into external memory and internal memory. External Storage is usually a magnetic medium or a CD, which can store information for a long time. Memory refers to the storage part on the motherboard. It is used to store the currently

DMA usage 1. Key Points of chip DMA usage: In the dma use of the ak3224 chip, the RAM address must be 4-byte aligned as the target address and Source Address of the DMA transmission. In addition, the RAM address within the DMA Operation length must be consecutive. However, we found that when the RAM address in the nandflash driver is used as the target address, o

on register relative offset to the Register. When the compilation compiler compiles the source program, the ADR pseudocommand is replaced by an appropriate command by the compiler. Generally, the compiler uses an add or sub command to implement this ADR pseudocommand. If it cannot be implemented using one command, an error is generated and compilation fails. ADR pseudocommand format: ADR {cond} register, expr Value Range of the address expression expr: When the address value is in byte ali

of using the x86 processor page feature? The total size of all programs loaded into memory can exceed the amount of physical memory installed in the computer. The size of all programs loaded into the memory can exceed the size of the installed physical memory. 11. Can you think of a reason why MS-DOS was not designed to support protected-Mode Programming? 12. In real-address mode, demonstrate two segment-offset addresses that point to the same linear address. 2.4 components of typical x

Source: http://blog.csdn.net/embeddedfly/article/details/6150452 Detailed analysis of MMU setting process in ce5.0-eboot Assembly startup. s The following is the startup code of the smdk Development Board startup. S.;------------------------------------------------------------------------------- Memorymap equ 0x2a4Bank_size equ 0x00100000; 1 MB per bank in memorymap ArrayBank_shift equ 20 ; Define Ram space for the page tables:;Phybase equ 0x3000000

The original English version "ARM Linux kernel boot requirements" was written by Russell king, the maintainer of the ARM Linux kernel. Here I will translate it into Chinese for your convenience. Original: http://www.arm.linux.org.uk/developer/booting.php Author: Russell kingInitial date: May 18,200 2 Revision: 1-17 September 20042-30 September 2004 To start ARM Linux, you first need a bootloader, which is a very small program (started before the kernel runs ). The first phase of bootloader is t

application stack and heap are located in the same storage block and grow in the opposite direction. When allocating a memory space in the heap area, you need to check the stack pointer. Another scenario is that the stack and heap use two separate storage areas. For RAM with extremely fast speed, you can choose to use it only for stacks. To use this two-region model, you need to import the use_two_region_memory symbol. To use heap, you need to check

1. Why do we need to relocate global variables? First, we need to study why we need to re-locate the global variables of bootloader. It is inevitable to define some global variables in the source code of bootloader. These global variables are placed in the Data Segment Storage Area of the compiled executable binary file. The bootloader image file is either run in the xip mode in the ROM or copied to one disk. the area defined as ramimage In the bib project file is used as a rom even though it is

Xilinx-based Synthesize The so-called synthesis means to translate design inputs such as the HDL language and schematic diagram into logical connections (I .e., network tables) between logical units registered with, or, non-users and RAM and triggers ). Optimize the logical connection generated based on the target and requirement (constraints.ISE-XST XST is a comprehensive tool developed by Xilinx. We can integrate and implement the input, simulation

use the built-in pointer of the nand flash memory to point to the respective first address. The Operation Features of nand flash memory are as follows: The minimum unit of the erasure operation is block. each bit of the nand flash memory chip can only change from 1 to 0, but not from 0 to 1, therefore, the corresponding block must be erased before writing data to it; the 6th bytes of OOB are the bad fast sign, that is, if it is not a bad block, the value is ff; otherwise, it is a bad block; exc

I have learned about the Java Memory Model in the previous section. To improve the execution performance, jmm introduces two concepts: working memory and primary memory. before continuing to discuss this, we must first clarify four storage media types: registers, advanced caches, ram, and Rom. Ram and Rom are familiar to everyone. We can think of them as memory and hard disk. Registers are part of the proce

is now using the SRAM-based lookup table structure, there are some military and aerospace-grade FPGA using flash or fuse and reverse fuse process lookup table structure. The repeated configuration of the FPGA is accomplished by burning the file to change the contents of the lookup table.Based on the basic knowledge of the digital circuit, it is possible to know that for a logical operation of an n input, there can be at most only 2n results, whether it is a non-operation or an XOR operation. Th

, it indicates that the CPU is working close to full capacity. However, when the CPU is fully loaded, UNIX always tries to keep the CPU as busy as possible to maximize the task throughput. The only value that can determine the CPU bottleneck is the r (running Queue) value. Use VMSTAT to identify RAM bottlenecks Database servers only have limited RAM, and memory contention is a common problem in Oracle. Fir

memory allocation and partitioning in iOS developmentAbout RamromRAM and ROM are specific storage spaces, collectively known as memory.RAM (Random access memory): Run memory, the CPU can be directly accessed, read and write very fast, but not power-down storage. It is also divided into: Dynamic DRAM, a bit slower, requires regular refresh (charging), we often say that the memory bar refers to it, the price will be slightly lower, the mobile phone memory is also referred to it. Stati