| podobné slovo | definícia |
burst static random access memory
(foldoc) | Burst Static Random Access Memory
BSRAM
(BSRAM) A kind of SRAM used primarily for external
Level 2 cache memory.
[How does it work?]
(1998-02-24)
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digital versatile disk random access memory
(foldoc) | Digital Versatile Disk Random Access Memory
DVD-RAM
(DVD-RAM) Rewritable DVD media that is recordable
on both sides, giving up to 9.6GB of storage. A drive can
record to disk and read from it at the same time, so the term
full duplex is often used. There are two general types of
media: traditional discrete disk in DVD or Jewel case, and one
in a permanent case like a large floppy; the disk remains in
the case, and the case goes into the drive. The former can
sometimes be read by regular DVD drives; the latter obviously
cannot.
{Technical details, somewhat dated, at burnworld.com
(http://burnworld.com/dvd/primer/dvdram.htm)}.
(2005-01-26)
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double data rate random access memory
(foldoc) | Double Data Rate Random Access Memory
DDR
DDR-RAM
DDR-SDRAM
Double Data Rate Synchronous Random Access Memory
(DDR-RAM, DDR-SDRAM ...Synchronous...) RAM that
transfers data on both 0-1 and 1-0 clock transitions,
theoretically yielding twice the data transfer rate of normal
RAM or SDRAM.
{DDR-RAM Article
(http://pcreview.co.uk/Article.php?aid=9)}.
{DDR-SDRAM Article
(http://www4.tomshardware.com/mainboard/00q4/001030/)}.
(2001-05-24)
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double data rate synchronous random access memory
(foldoc) | Double Data Rate Random Access Memory
DDR
DDR-RAM
DDR-SDRAM
Double Data Rate Synchronous Random Access Memory
(DDR-RAM, DDR-SDRAM ...Synchronous...) RAM that
transfers data on both 0-1 and 1-0 clock transitions,
theoretically yielding twice the data transfer rate of normal
RAM or SDRAM.
{DDR-RAM Article
(http://pcreview.co.uk/Article.php?aid=9)}.
{DDR-SDRAM Article
(http://www4.tomshardware.com/mainboard/00q4/001030/)}.
(2001-05-24)
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enhanced dynamic random access memory
(foldoc) | Enhanced Dynamic Random Access Memory
EDRAM
(EDRAM)
(http://ruralnet.net/~prairie).
[Summary?]
(1995-11-23)
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extended data out dynamic random access memory
(foldoc) | Extended Data Out Dynamic Random Access Memory
EDO DRAM
EDO memory
EDO RAM
Extended Data Out Random Access Memory
(EDO DRAM, EDO RAM) A type of DRAM designed to
access nearby memory locations faster than FPM DRAM.
Extended Data Out DRAM (EDO-DRAM) allows the data outputs to
be kept active after the CAS\ signal goes inactive, using an
additional signal OE\ to control the data outputs. This can
be used in pipelined systems for overlapping accesses where
the next cycle is started before the data from the last cycle
is removed from the bus.
EDO DRAM is primarily used with Intel's Pentium processors
since with slower processors there is no significant
performance gain. To make use of the advanced features of EDO
an appropriate chipset, such as Triton, must be used. In
early 1995, EDO DRAM was available for computers from
Micron, Gateway 2000, and Intel Corporation; since then
other manufactures followed suit.
Note that in comparison to Burst EDO EDO is sometimes
referred to as "Standard EDO".
(1996-06-25)
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extended data out random access memory
(foldoc) | Extended Data Out Dynamic Random Access Memory
EDO DRAM
EDO memory
EDO RAM
Extended Data Out Random Access Memory
(EDO DRAM, EDO RAM) A type of DRAM designed to
access nearby memory locations faster than FPM DRAM.
Extended Data Out DRAM (EDO-DRAM) allows the data outputs to
be kept active after the CAS\ signal goes inactive, using an
additional signal OE\ to control the data outputs. This can
be used in pipelined systems for overlapping accesses where
the next cycle is started before the data from the last cycle
is removed from the bus.
EDO DRAM is primarily used with Intel's Pentium processors
since with slower processors there is no significant
performance gain. To make use of the advanced features of EDO
an appropriate chipset, such as Triton, must be used. In
early 1995, EDO DRAM was available for computers from
Micron, Gateway 2000, and Intel Corporation; since then
other manufactures followed suit.
Note that in comparison to Burst EDO EDO is sometimes
referred to as "Standard EDO".
(1996-06-25)
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fast page mode dynamic random access memory
(foldoc) | Fast Page Mode Dynamic Random Access Memory
FPM
FPM DRAM
Is this the same as {Page Mode Dynamic
Random Access Memory}?
(1996-10-06)
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ferroelectric random access memory
(foldoc) | Ferroelectric Random Access Memory
Ferroelectric RAM
FRAM
(FRAM) A type of non-volatile read/write {random
access} semiconductor memory. FRAM combines the advantages
of SRAM - writing is roughly as fast as reading, and EPROM
- non-volatility and in-circuit programmability. Current (Feb
1997) disadvantages are high cost and low density, but that
may change in the future. Density is currently at most 32KB
on a chip, compared with 512KB for SRAM, 1MB for EPROM and 8MB
for DRAM.
A ferroelectric memory cell consists of a ferroelectric
capacitor and a MOS transistor. Its construction is
similar to the storage cell of a DRAM. The difference is in
the dielectric properties of the material between the
capacitor's electrodes. This material has a high dielectric
constant and can be polarized by an electric field. The
polarisation remains until it gets reversed by an opposite
electrical field. This makes the memory non-volatile. Note
that ferroelectric material, despite its name, does not
necessarily contain iron. The most well-known ferroelectric
substance is BaTiO3, which does not contain iron.
Data is read by applying an electric field to the capacitor.
If this switches the cell into the opposite state (flipping
over the electrical dipoles in the ferroelectric material)
then more charge is moved than if the cell was not flipped.
This can be detected and amplified by sense amplifiers.
Reading destroys the contents of a cell which must therefore
be written back after a read. This is similar to the
precharge operation in DRAM, though it only needs to be done
after a read rather than periodically as with DRAM refresh.
In fact it is most like the operation of {ferrite core
memory}.
FRAM has similar applications to EEPROM, but can be written
much faster. The simplicity of the memory cell promises high
density devices which can compete with DRAM.
RAMTRON is the company behind FRAM.
(1997-02-17)
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non-volatile random access memory
(foldoc) | Non-Volatile Random Access Memory
NVRAM
(NVRAM) Static random-access memory which is made
into non-volatile storage either by having a battery
permanently connected or by saving its contents to EEPROM
before turning the power off and reloading it when power is
restored.
(1995-04-22)
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page mode dynamic random access memory
(foldoc) | Page Mode Dynamic Random Access Memory
Page Mode DRAM
A technique used to support faster
sequential access to DRAM by allowing any number of accesses
to the currently open row to be made after supplying the {row
address} just once.
The RAS signal is kept active, and with each falling edge
of the CAS\ signal a new column address can be supplied
and the corresponding bits can be accessed. This is faster
than a full RAS-CAS cycle because only the shorter Column
Access Time needs to be obeyed.
Note that strictly speaking such a DRAM is not a true {random
access memory} since accesses to the open row are faster than
to other locations.
EDO RAM is replacing Page Mode DRAM in many new
microcomputers.
[Is "Fast Page Mode" the same as "Page Mode"?]
(1996-10-06)
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random access memory digital-to-analog converter
(foldoc) | Random Access Memory Digital-to-Analog Converter
RAMDAC
(RAMDAC) A combination of three fast DACs with a
small SRAM used in graphics display adapters to store the
colour palette and to generate the analog signals to drive a
colour monitor. The logical colour number from the display
memory is fed into the address inputs of the SRAM to select a
palette entry to appear on the output of the SRAM. This entry
is composed of three separate values corresponding to the
three components (red, green, and blue) of the desired
physical colour. Each component value is fed to a separate
DAC, whose analog output goes to the monitor, and ultimately
to one of its three electron guns (or equivalent in
non-CRT displays).
DAC word lengths range usually from 6 to 10 bits. The SRAM's
wordlength is three times the DAC's word length. The SRAM
acts as a colour lookup table. It usually has 256 entries
(and thus an 8-bit address). If the DAC's word length is also
8 bits, we have a 256 x 24-bit SRAM which allows a selection
of 256 out of 16777216 possible colours for the display. The
contents of the SRAM can be changed while the display is not
active (during display blanking times). The SRAM can
usually be bypassed and the DACs can be fed directly by
display data (for true colour modes).
(1996-03-24)
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single data rate random access memory
(foldoc) | Single Data Rate Random Access Memory
SDR-RAM
SDR-SDRAM
Single Data Rate Synchronous Dynamic Random Access Memory
(SDR-RAM, SDR-SDRAM, Single Data Rate Synchronous
Dynamic Random Access Memory) RAM or SDRAM that transfers
data on only one clock transition (0-1 or 1-0), in contrast
to DDR-RAM.
(2001-05-24)
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single data rate synchronous dynamic random access memory
(foldoc) | Single Data Rate Random Access Memory
SDR-RAM
SDR-SDRAM
Single Data Rate Synchronous Dynamic Random Access Memory
(SDR-RAM, SDR-SDRAM, Single Data Rate Synchronous
Dynamic Random Access Memory) RAM or SDRAM that transfers
data on only one clock transition (0-1 or 1-0), in contrast
to DDR-RAM.
(2001-05-24)
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synchronous dynamic random access memory
(foldoc) | Synchronous Dynamic Random Access Memory
SDRAM
Synchronous DRAM
(SDRAM, Synchronous DRAM) A form of DRAM which
adds a separate clock signal to the control signals. SDRAM
chips can contain more complex state machines, allowing them
to support "burst" access modes that clock out a series of
successive bits (similar to the nibble mode DRAM).
(2007-05-08)
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synchronous graphics random access memory
(foldoc) | Synchronous Graphics Random Access Memory
SGRAM
Synchronous Graphics RAM
(SGRAM, Synchronous Graphics RAM) A type of
Synchronous DRAM optimised for use in graphics hardware.
Extra features can include burst operation, block write
and write per bit. SGRAMs are designed to provide the very
high throughput needed for graphics-intensive operations
such as 3d rendering and full-motion video.
(1996-11-28)
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window random access memory
(foldoc) | Window Random Access Memory
Window RAM
WRAM
(WRAM, Window RAM) A kind of RAM which
is faster than VRAM.
WRAM is used in the Matrox MGA Millennium video display card
and almost certainly elsewhere.
[More details?]
(1996-06-05)
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