My OperaA+ Exam Cram 2 Memory
Sunday, April 8, 2012 5:22:01 AM
Memory is just a temporary place to shop knowledge till the CPU can get to it. This data could be system instructions, data, or each. A typical instruction may well be a request to retailer a number or an occasion someplace. One other might possibly be to retrieve that information and facts from a specific placean address. Volatile memory can only hold specifics when a regular electrical existing is present. Nonvolatile memory can hold knowledge without any electrical existing.
CAUTION
Volatile, from the Latin "to fly," suggests that knowledge "flies away" when there's no electricity to help keep it in location. Television reporters often refer to an explosive circumstance as a volatile situation, meaning that it could transform at any second. Nonvolatile memory, because it is not volatile, stays precisely the same devoid of any will need for electricity.
Conceptual Overview
Memory is relatively straightforward to understand, as soon as you've grasped the fundamental concepts. Inside a nutshell, a CPU moves bits of information into registers (storage places inside a chip). Just after it really is dealt with these information bits to its satisfaction, the CPU works together with a memory controller to move the outcomes out to memory cells (storage places on a memory chip). Both registers and memory cells have memory addresses, and each time a bit of information goes somewhere, it crosses a bus of some kind. That's it! Now go pass the exam.
All appropriate, so it is a bit, so to speak, a great deal more complicated than that. Most memory began as dynamic random access memory (DRAM), along with the primary modifications have already been to either speed up the memory to match the CPU, or to speed up the CPU to match the memory. For by far the most portion, the history of memory development revolves around synchronizing these two subsystems.
NOTE
When we refer to speeding up memory, this typically indicates increasing either the actual speed from the chips or rising the clock speed of linked buses.
Memory involves various basic ideas, the first of which is a grid or matrix. Because of this, we're going to put Table three.1 to a slightly various use, generating it a sort of "mind map." Should you can see the way the overall ideas break down on a grid, then perhaps they'll be less difficult to don't forget.
NOTE
A matrix is nothing far more than an arrangement of columns and rows, like a spreadsheet or an Etch-a-Sketch. Columns go across the page, and rows go down the side. Cells going left to right (horizontally) have an X coordinate. Cells going up and down (vertically) possess a Y coordinate. The direction of rows or columns is known as the axis. Combining each the X and Y coordinates offers us an address in the grid, like a cell address within a spreadsheet.
Table 3.1 Thoughts map of basic memory ideas.
Data Storage C Nonvolatile
Disks Temporary swap files
ROM C Nonvolatile BIOS
Programmable ROM CMOS C volatile (trickle charge)
Flash BIOS C Nonvolatile
RAM C Volatile
Kinds of RAM
Types of Packaging
Principal Memory
DRAM
DIP
SRAM
SIMM
SDRAM
DIMM
RDRAM
RIMM
VRAM
(DDR SDRAM)
Cache Memory
L-1 and L-2
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CAUTION
Volatile, from the Latin "to fly," suggests that knowledge "flies away" when there's no electricity to help keep it in location. Television reporters often refer to an explosive circumstance as a volatile situation, meaning that it could transform at any second. Nonvolatile memory, because it is not volatile, stays precisely the same devoid of any will need for electricity.
Conceptual Overview
Memory is relatively straightforward to understand, as soon as you've grasped the fundamental concepts. Inside a nutshell, a CPU moves bits of information into registers (storage places inside a chip). Just after it really is dealt with these information bits to its satisfaction, the CPU works together with a memory controller to move the outcomes out to memory cells (storage places on a memory chip). Both registers and memory cells have memory addresses, and each time a bit of information goes somewhere, it crosses a bus of some kind. That's it! Now go pass the exam.
All appropriate, so it is a bit, so to speak, a great deal more complicated than that. Most memory began as dynamic random access memory (DRAM), along with the primary modifications have already been to either speed up the memory to match the CPU, or to speed up the CPU to match the memory. For by far the most portion, the history of memory development revolves around synchronizing these two subsystems.
NOTE
When we refer to speeding up memory, this typically indicates increasing either the actual speed from the chips or rising the clock speed of linked buses.
Memory involves various basic ideas, the first of which is a grid or matrix. Because of this, we're going to put Table three.1 to a slightly various use, generating it a sort of "mind map." Should you can see the way the overall ideas break down on a grid, then perhaps they'll be less difficult to don't forget.
NOTE
A matrix is nothing far more than an arrangement of columns and rows, like a spreadsheet or an Etch-a-Sketch. Columns go across the page, and rows go down the side. Cells going left to right (horizontally) have an X coordinate. Cells going up and down (vertically) possess a Y coordinate. The direction of rows or columns is known as the axis. Combining each the X and Y coordinates offers us an address in the grid, like a cell address within a spreadsheet.
Table 3.1 Thoughts map of basic memory ideas.
Data Storage C Nonvolatile
Disks Temporary swap files
ROM C Nonvolatile BIOS
Programmable ROM CMOS C volatile (trickle charge)
Flash BIOS C Nonvolatile
RAM C Volatile
Kinds of RAM
Types of Packaging
Principal Memory
DRAM
DIP
SRAM
SIMM
SDRAM
DIMM
RDRAM
RIMM
VRAM
(DDR SDRAM)
Cache Memory
L-1 and L-2
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