8/24/22, 11:59 AM
`
`What is the difference between SDRAM, DDR1, DDR2, DDR3 and DDR4? - Transcend Information, Inc.
`
`(/)
`
`Consumer Products (/Consumer)
`
`Embedded Solutions (/Embedded)
`
`Support (/support/service)
`
`About Us ( /abo
`
`Product Support
`
`What is the difference between SDRAM, DDR1, DDR2, DDR3 and
`DDR4?
`
`Category : Specification / Capacity / Performance
`
`SDRAM (Synchronous Dynamic Random Access Memory):
`"Synchronous" tells about the behaviour of the DRAM type. In late 1996, SDRAM began to appear in systems. Unlike previous
`technologies, SDRAM is designed to synchronize itself with the timing of the CPU. This enables the memory controller to know the
`exact clock cycle when the requested data will be ready, so the CPU no longer has to wait between memory accesses. For example,
`PC66 SDRAM runs at 66 MT/s, PC100 SDRAM runs at 100 MT/s, PC133 SDRAM runs at 133 MT/s, and so on.
`SDRAM can stand for SDR SDRAM (Single Data Rate SDRAM), where the I/O, internal clock and bus clock are the same. For example,
`the I/O, internal clock and bus clock of PC133 are all 133 Mhz. Single Data Rate means that SDR SDRAM can only read/write one time
`in a clock cycle. SDRAM have to wait for the completion of the previous command to be able to do another read/write operation.
`
`DDR SDRAM (Double Data Rate SDRAM):
`The next generation of SDRAM is DDR, which achieves greater bandwidth than the preceding single data rate SDRAM by transferring
`data on the rising and falling edges of the clock signal (double pumped). Effectively, it doubles the transfer rate without increasing the
`frequency of the clock. The transfer rate of DDR SDRAM is the double of SDR SDRAM without changing the internal clock. DDR SDRAM,
`as the first generation of DDR memory, the prefetch buffer is 2bit, which is the double of SDR SDRAM. The transfer rate of DDR is
`between 266~400 MT/s. DDR266 and DDR400 are of this type.
`
`DDR2 SDRAM(Double Data Rate Two SDRAM):
`Its primary benefit is the ability to operate the external data bus twice as fast as DDR SDRAM. This is achieved by improved bus signal.
`The prefetch buffer of DDR2 is 4 bit(double of DDR SDRAM). DDR2 memory is at the same internal clock speed (133~200MHz) as DDR,
`but the transfer rate of DDR2 can reach 533~800 MT/s with the improved I/O bus signal. DDR2 533 and DDR2 800 memory types are
`on the market.
`
`DDR3 SDRAM(Double Data Rate Three SDRAM):
`DDR3 memory reduces 40% power consumption compared to current DDR2 modules, allowing for lower operating currents and
`voltages (1.5 V, compared to DDR2's 1.8 V or DDR's 2.5 V). The transfer rate of DDR3 is 800~1600 MT/s. DDR3's prefetch buffer width is
`8 bit, whereas DDR2's is 4 bit, and DDR's is 2 bit. DDR3 also adds two functions, such as ASR (Automatic Self-Refresh) and SRT (Self-
`Refresh Temperature). They can make the memory control the refresh rate according to the temperature variation.
`
`DDR4 SDRAM (Double Data Rate Fourth SDRAM):
`DDR4 SDRAM provides the lower operating voltage (1.2V) and higher transfer rate. The transfer rate of DDR4 is 2133~3200 MT/s.
`DDR4 adds four new Bank Groups technology. Each bank group has the feature of singlehanded operation. DDR4 can process 4 data
`within a clock cycle, so DDR4's efficiency is better than DDR3 obviously. DDR4 also adds some functions, such as DBI
`(Data Bus Inversion), CRC (Cyclic Redundancy Check) and CA parity. They can enhance DDR4 memory's signal integrity, and improve
`the stability of data transmission/access.
`
`https://www.transcend-info.com/support/faq-296#:~:text=DDR3's prefetch buffer width is,according to the temperature variation.
`
`1/2
`
`Netlist Ex 2018
`Samsung v Netlist
`IPR2022-00996
`
`
`
`What is the difference between SDRAM, DDR1, DDR2, DDR3 and DDR4? - Transcend Information, Inc.
`
`(/)
`
`Consumer Products (/Consumer)
`
`Embedded Solutions (/Embedded)
`
`Support (/support/service)
`
`About Us ( /abo
`
`Product Support
`
`What is the difference between SDRAM, DDR1, DDR2, DDR3 and
`DDR4?
`
`Category : Specification / Capacity / Performance
`
`SDRAM (Synchronous Dynamic Random Access Memory):
`"Synchronous" tells about the behaviour of the DRAM type. In late 1996, SDRAM began to appear in systems. Unlike previous
`technologies, SDRAM is designed to synchronize itself with the timing of the CPU. This enables the memory controller to know the
`exact clock cycle when the requested data will be ready, so the CPU no longer has to wait between memory accesses. For example,
`PC66 SDRAM runs at 66 MT/s, PC100 SDRAM runs at 100 MT/s, PC133 SDRAM runs at 133 MT/s, and so on.
`SDRAM can stand for SDR SDRAM (Single Data Rate SDRAM), where the I/O, internal clock and bus clock are the same. For example,
`the I/O, internal clock and bus clock of PC133 are all 133 Mhz. Single Data Rate means that SDR SDRAM can only read/write one time
`in a clock cycle. SDRAM have to wait for the completion of the previous command to be able to do another read/write operation.
`
`DDR SDRAM (Double Data Rate SDRAM):
`The next generation of SDRAM is DDR, which achieves greater bandwidth than the preceding single data rate SDRAM by transferring
`data on the rising and falling edges of the clock signal (double pumped). Effectively, it doubles the transfer rate without increasing the
`frequency of the clock. The transfer rate of DDR SDRAM is the double of SDR SDRAM without changing the internal clock. DDR SDRAM,
`as the first generation of DDR memory, the prefetch buffer is 2bit, which is the double of SDR SDRAM. The transfer rate of DDR is
`between 266~400 MT/s. DDR266 and DDR400 are of this type.
`
`DDR2 SDRAM(Double Data Rate Two SDRAM):
`Its primary benefit is the ability to operate the external data bus twice as fast as DDR SDRAM. This is achieved by improved bus signal.
`The prefetch buffer of DDR2 is 4 bit(double of DDR SDRAM). DDR2 memory is at the same internal clock speed (133~200MHz) as DDR,
`but the transfer rate of DDR2 can reach 533~800 MT/s with the improved I/O bus signal. DDR2 533 and DDR2 800 memory types are
`on the market.
`
`DDR3 SDRAM(Double Data Rate Three SDRAM):
`DDR3 memory reduces 40% power consumption compared to current DDR2 modules, allowing for lower operating currents and
`voltages (1.5 V, compared to DDR2's 1.8 V or DDR's 2.5 V). The transfer rate of DDR3 is 800~1600 MT/s. DDR3's prefetch buffer width is
`8 bit, whereas DDR2's is 4 bit, and DDR's is 2 bit. DDR3 also adds two functions, such as ASR (Automatic Self-Refresh) and SRT (Self-
`Refresh Temperature). They can make the memory control the refresh rate according to the temperature variation.
`
`DDR4 SDRAM (Double Data Rate Fourth SDRAM):
`DDR4 SDRAM provides the lower operating voltage (1.2V) and higher transfer rate. The transfer rate of DDR4 is 2133~3200 MT/s.
`DDR4 adds four new Bank Groups technology. Each bank group has the feature of singlehanded operation. DDR4 can process 4 data
`within a clock cycle, so DDR4's efficiency is better than DDR3 obviously. DDR4 also adds some functions, such as DBI
`(Data Bus Inversion), CRC (Cyclic Redundancy Check) and CA parity. They can enhance DDR4 memory's signal integrity, and improve
`the stability of data transmission/access.
`
`https://www.transcend-info.com/support/faq-296#:~:text=DDR3's prefetch buffer width is,according to the temperature variation.
`
`1/2
`
`Netlist Ex 2018
`Samsung v Netlist
`IPR2022-00996
`
`
`
`8/24/22, 11:59 AM
`
`What is the difference between SDRAM, DDR1, DDR2, DDR3 and DDR4? - Transcend Information, Inc.
`
`(/Support/FAQ/FAQPics/DDR.JPG)
`
`Is the answer helpful?
`
`Yes
`
`NO
`
`Related
`
`What is a dual-channel memory module? Is there any limitation in use? (/Support/FAQ-455)
`
`How come my 32-bit operating system would not recognize memory modules with capacity larger than 4GB, or fails to boot when
`such a memory is installed? (/Support/FAQ-469)
`
`Why is my iMac not starting up after I installed Transcend memory on it? (/Support/FAQ-1108)
`
`Technical Support
`
`If the answer can't help you, you can contact the Tech Support Department
`
`Get Started (/Support/contact_form)
`
`Consumer Products
`
`Embedded Solutions
`
`Support
`
`About Us
`
`Internal SSDs (/product/internal-ssd)
`
`Embedded SSD Solutions
`
`Product Support (/support/service)
`
`Company Profile (/about/compa
`
`Portable SSDs (/product/portable-ssd)
`
`(/Embedded/Product/ssd)
`
`Software Download (/support/software)
`
`Advantage (/about/advantage)
`
`External Hard Drives (/product/external-hard-
`
`Embedded Flash Solutions
`
`Compatibility (/support/compatibility)
`
`Awards (/about/awards)
`
`drive)
`
`(/Embedded/Product/flash)
`
`Warranty Policy (/Legal/?no=7)
`
`Investor Relations (/about/month
`
`Personal Cloud Storage (/product/personal-
`
`Embedded Memory Cards
`
`Warranty Check (/support/verification)
`
`Shareholder Services (/about/sto
`
`cloud)
`
`(/Embedded/Product/memory-cards)
`
`Where to Buy (/support/buy)
`
`Press (/about/press)
`
`Dashcams (/product/dashcam)
`
`Embedded DRAM Modules
`
`Partner Center (/partnercenter/)
`
`Green Initiatives (/about/green)
`
`Body Cameras (/product/body-camera)
`
`(/Embedded/Product/modules)
`
`Memory Cards (/product/memory-card)
`
`Technologies (/Embedded/Technologies)
`
`USB Flash Drives (/product/usb)
`
`Applications (/Embedded/Applications)
`
`DRAM Modules (/product/dram-module)
`
`Software Solutions (/Embedded/Software)
`
`Card Readers, DVD Writers & Accessories
`
`(/product/card-reader-accessory)
`
`Apple Solutions (/apple)
`
`Customized Solutions (/products/oem.aspx)
`
`Contact Us (/support/contact)
`
`Copyright© 2022 Transcend Information, Inc. All Rights Reserved. Contact Us (/support/contact) Legal (/legal/)
`
`You have already accepted cookies, but you may still revoke your consent at any time. Please see more details at Cookie Statement (/Legal/?no=15).
`
`Change Settings
`
`https://www.transcend-info.com/support/faq-296#:~:text=DDR3's prefetch buffer width is,according to the temperature variation.
`
`2/2
`
`Netlist Ex 2018
`Samsung v Netlist
`IPR2022-00996
`
`
Accessing this document will incur an additional charge of $.
After purchase, you can access this document again without charge.
Accept $ Charge
Still Working On It
This document is taking longer than usual to download. This can happen if we need to contact the court directly to obtain the document and their servers are running slowly.
Give it another minute or two to complete, and then try the refresh button.
A few More Minutes ... Still Working
It can take up to 5 minutes for us to download a document if the court servers are running slowly.
Thank you for your continued patience.
This document could not be displayed.
We could not find this document within its docket. Please go back to the docket page and check the link. If that does not work, go back to the docket and refresh it to pull the newest information.
Your account does not support viewing this document.
You need a Paid Account to view this document. Click here to change your account type.
Your account does not support viewing this document.
Set your membership
status to view this document.
With a Docket Alarm membership, you'll
get a whole lot more, including:
- Up-to-date information for this case.
- Email alerts whenever there is an update.
- Full text search for other cases.
- Get email alerts whenever a new case matches your search.
One Moment Please
The filing “” is large (MB) and is being downloaded.
Please refresh this page in a few minutes to see if the filing has been downloaded. The filing will also be emailed to you when the download completes.
Your document is on its way!
If you do not receive the document in five minutes, contact support at support@docketalarm.com.
Sealed Document
We are unable to display this document, it may be under a court ordered seal.
If you have proper credentials to access the file, you may proceed directly to the court's system using your government issued username and password.
Access Government Site
