memory Flashcards
1
Q
direct access memory
A
accesses data sequentially
no immediate data
2
Q
random access memory
A
uniform time for access
3
Q
volatile data
A
data lost when memory not powered (refreshed)
ex: registers, main memory(RAM)
4
Q
non-volatile data (NVM)
A
data stored persistently
ex: hard disk, SSDs, flash memory
5
Q
SRAM
A
4-/6- transistors
fast -> used in CPU registers, caches
energy hungry -> expensive
6
Q
DRAM
A
slow, used in main memory
7
Q
SDRAM
A
uses a clock
single data rate: we can only read/write on one edge
data transfer per second: f x W
8
Q
double data rate
A
increase rate of i/o buffer
9
Q
bottleneck for faster memory
A
energy
10
Q
CPU-memory communication goes through the
A
Northbridge
11
Q
Northbridge
A
CPU-RAM interconnection
12
Q
performance gap processor-memory
A
CPU performance increase more than memory
