Ch9 Hardware Flashcards
(20 cards)
what is decoupling?
prevention of undesired coupling between subsystems.
decoupling capacitor supresses high frequency noise
What is ground bounce?
gate voltage can appear to be less than the local ground potential, causing unstable operation of a logic gate.
What is an electromotive force?
Difference in potential that tends to give rise to an electric current
What is inductance?
Property of a conductor which causes an electromotive force to be generated by a change in current.
what is a ferrite bead?
suppresses high frequency noise
which end of a shielded cable do you shield?
source end
What is faradays cage?
an earthed metal screen surrounding a piece of equipment to exclude electrostatic and electromagnetic influences
why do we need to separate analog and digital circuits?
because digital noise could induce noise in the analog signal
What is the order of memory devices in terms of highest to lowest speed?
CPU registers Primary Cache Local Memory Secondary Cache Global Memory Mass Storage
How quickly does microprocessor speed increase a yr?
Increases 60% a year (doubles in 1.5 yrs)
how quickly does DRAM speed increase?
9% per year
what is DRAM?
dynamic random access memory.
Type of memory used for data or program code
Stores each bit of data in separate capacitor within an integrated circuit
DRAM is volatile
What is random access memory?
allows data items to be read or written in the same amount of time.
Where is processor data stored?
stored in CPU registers
Give a feature of DRAM?
Large Storage capacity, slow access time
What is HDD?
Hard Disk Drive.
Mechanism that controls the positioning, reading and writing of the hard disk.
How do we bridge the timing gaps?
Using Caching
What is cache memory?
Also called CPU memory
It’s RAM that a computer microprocessor can access more quickly than it can regular RAM
Its volatile, provides high speed data access and stores frequently used computer programs, applications and data
How fast is cache memory?
Its the fastest memory in a computer
How does cache memory work?
It bridges the gap between DRAM and CPU.
What happens is
