MSI 845 PRO4 Manual page 82

DMA (direct memory access)
A transfer mode between the main memory and the peripheral devices
that without passing through the CPU. Using the DMA controller, data
is transferred much faster.
DRAM (Dynamic RAM)
A most common type of computer memory. It usually uses one transistor
and a capacitor to represent a bit. As the development of technology, the
memory type and specification used in computer becomes variety, such
as SDRAM, DDR SDRAM, and RDRAM. For further instruction, please
see the table below:
Type
FPM (60,70ns)
EDO (50,60,70ns)
SDRAM (66MHz)
SDRAM (100MHz)
SDRAM (133MHz)
RDRAM (Direct Rambus)
DDR SDRAM (100MHz)
DDR SDRAM (133MHz)
* Memory channel width (64 bits started with 75MHz Pentium)
Source: Computer Desktop Encyclopedia
ECC Memory (error correcting code memory)
A type of memory that contains special circuitry for testing the accuracy
of data and correcting the errors on the fly.
IDE (Integrated Drive Electronics)
A type of disk-drive interface widely used to connect hard disks, CD-
ROMs and tape drives to a PC, in which the controller electronics is
integrated into the drive itself, eliminating the need for a separate adapter
card. The IDE interface is known as the ATA (AT Attachment)
specification.
Dynamic RAM (DRAM) Memory Technologies
First Used Clock Rate
1990
1994
1996
1998
1999
1999
2000
2000
Bus* Width
25MHz 64 bits
40MHz 64 bits
66MHz 64 bits
100MHz 64 bits
133MHz 64 bits
400MHz 16 bits
100MHz 64 bits
133MHz 64 bits
A-3
Glossary
Peak Volts
Bandwidth
200 MBps 5v
320 MBps 5v
528 MBps 3.3v
800 MBps 3.3v
1.1 GBps 3.3v
1.6 GBps 2.5v
1.6 GBps 3.3v
2.1 GBps 3.3v