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Method of computer bus operation
In computing, double data rate (DDR) describes a computer bus that transfers data on both the rising and falling edges of the clock signal and hence doubles
Double_data_rate
Type of computer memory
Double data rate synchronous dynamic random-access memory (DDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) widely used in computers
DDR_SDRAM
Type of computer memory
Low-Power Double Data Rate (LPDDR) is a type of synchronous dynamic random-access memory (SDRAM) designed to use less power than conventional memory. It
LPDDR
Type of computer memory introduced 2014
Double Data Rate 4 Synchronous Dynamic Random-Access Memory (DDR4 SDRAM) is a type of synchronous dynamic random-access memory with a high-bandwidth ("double
DDR4_SDRAM
Third generation of double-data-rate synchronous dynamic random-access memory
Double Data Rate 3 Synchronous Dynamic Random-Access Memory (DDR3 SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) with a high-bandwidth
DDR3_SDRAM
Type of computer memory
Single data rate SDRAM (SDR SDRAM or SDR) is the original generation of SDRAM; it made a single transfer of data per clock cycle. Double data rate SDRAM
Dynamic_random-access_memory
Communication signaling technique
This is in contrast to double data rate systems, in which the clock and data lines operate at the same frequency. Quad data rate technology was introduced
Quad_data_rate
Type of graphics card memory
Graphics Double Data Rate 7 Synchronous Dynamic Random-Access Memory (GDDR7 SDRAM) is a type of synchronous graphics random-access memory (SGRAM) with
GDDR7_SDRAM
Type of computer memory
Double Data Rate 5 Synchronous Dynamic Random-Access Memory (DDR5 SDRAM) is a type of synchronous dynamic random-access memory. Compared to its predecessor
DDR5_SDRAM
Type of synchronous graphics random-access memory
Graphics Double Data Rate 6 Synchronous Dynamic Random-Access Memory (GDDR6 SDRAM) is a type of synchronous graphics random-access memory (SGRAM) with
GDDR6_SDRAM
Type of random-access memory
Double Data Rate 6 Synchronous Dynamic Random-Access Memory (DDR6 SDRAM) is the next planned type of synchronous dynamic random-access memory with a high-bandwidth
DDR6_SDRAM
Synchronous serial communication interface
multiple lines for I/O, some devices increase the transfer rate by using double data rate transmission. SGPIO is essentially another (incompatible) application
Serial_Peripheral_Interface
Type of high performance DRAM graphics card memory
Graphics Double Data Rate 5 Synchronous Dynamic Random-Access Memory (GDDR5 SDRAM) is a type of synchronous graphics random-access memory (SGRAM) with
GDDR5_SDRAM
Device controlling access and addressing of memory
Single data rate (SDR) memory controllers drive SDR SDRAM, where data is transferred once per clock. They are far simpler than double data rate memory
Memory_controller
Second generation of double-data-rate synchronous dynamic random-access memory
Double Data Rate 2 Synchronous Dynamic Random-Access Memory (DDR2 SDRAM) is a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) interface
DDR2_SDRAM
Unit of measurement
telecommunications, data rate units are commonly multiples of bits per second (bit/s) and bytes per second (B/s). For example, the data rates of modern residential
Data-rate_units
Serial bus specification
The HDR-DDR mode uses double data rate signaling on the SDA line with a 12.5 MHz clock to achieve a 25 Mbit/s raw data rate (20 Mbit/s effective). This
I3C_(bus)
Type of computer memory
multiple banks of memory, thereby increasing effective bandwidth. Double data rate SDRAM, known as DDR SDRAM, was first demonstrated by Samsung in 1997
Synchronous dynamic random-access memory
Synchronous_dynamic_random-access_memory
Data transfer channel connecting parts of a computer
solution to this problem has been to double pump the bus. Often, a serial bus can be operated at higher overall data rates than a parallel bus, despite having
Bus_(computing)
Topics referred to by the same term
Dolores del Río Double data rate, a data transfer strategy of a computer bus DDR SDRAM, a computer memory standard that uses double-data-rate transfers DDr
DDR
Type of computer memory that transfers data using QDR
Quad data rate (QDR) SRAM is a type of static RAM computer memory that can transfer up to four words of data in each clock cycle. Like double data-rate (DDR)
Quad_data_rate_SRAM
Type of graphics card memory
GDDR3 SDRAM (Graphics Double Data Rate 3 SDRAM) is a type of DDR SDRAM specialized for graphics processing units (GPUs) offering less access latency and
GDDR3_SDRAM
Type of graphics card memory
Graphics Double Data Rate 4 Synchronous Dynamic Random-Access Memory (GDDR4 SDRAM) is a type of graphics card memory (SGRAM) specified by the JEDEC Semiconductor
GDDR4_SDRAM
Type of memory used on graphics cards
DDR5, although they share some of the same features—including double data rate (DDR) data transfers. As of 2025[update], GDDR SDRAM has been succeeded
GDDR_SDRAM
Type of memory used on processors that require high transfer rate memory
channel interface maintained a 128‑bit data bus operating at this double data rate (DDR). HBM1 supported transfer rates of 1 GT/s per pin (transferring 1 bit)
High_Bandwidth_Memory
Information transmission rate expressed in bits per second
bitrate, information rate, useful bit rate, payload rate, net data transfer rate, coded transmission rate, effective data rate or wire speed (informal
Bit_rate
Frequency at which a CPU chip or core is operating
performance of the computer regardless of clock rate. Crystal oscillator frequencies Double data rate Quad data rate Pulse wave Instructions per second Moore's
Clock_rate
Type of random-access memory
XDR DRAM (extreme data rate dynamic random-access memory) is a high-performance dynamic random-access memory interface. It is based on and succeeds RDRAM
XDR_DRAM
Electronic signal to synchronize circuits
active at either the rising edge, falling edge, or, in the case of double data rate, both in the rising and in the falling edges of the clock cycle. Most
Clock_signal
show the most recent year where there is published total fertility rate (TFR) data ranked by sovereign states and dependencies, and are ordered by organization
List of countries by total fertility rate
List_of_countries_by_total_fertility_rate
units "GRAPHICS DOUBLE DATA RATE (GDDR5) SGRAM STANDARD JESD212C". JEDEC. 2016-02-01. Retrieved 2016-08-10. "GRAPHICS DOUBLE DATA RATE (GDDR5X) SGRAM STANDARD
List_of_interface_bit_rates
Logical unit of storage in computer architecture
In a typical synchronous dynamic random-access memory (SDRAM) or double data rate SDRAM (DDR SDRAM), a bank consists of multiple rows and columns of
Memory_bank
Timing information of a memory module
in units of clock cycles, which for double data rate memory is half the speed of the commonly quoted transfer rate. Without knowing the clock frequency
Memory_timings
Data storage device
SDRAM (Double data rate SDRAM) – This could transfer twice the data (two consecutive words) on each clock cycle by double pumping (transferring data on both
Semiconductor_memory
Computer memory module
Single Data Rate (SDR) DRAM have the same bus frequency for data, address and control lines. DIMMs based on Double Data Rate (DDR) DRAM have data but not
DIMM
Electrical standards
and memory modules. SSTL is primarily designed for driving the DDR (double-data-rate) SDRAM modules used in computer memory; however, it is also used in
Stub_Series_Terminated_Logic
Central processing unit by Sony Computer Entertainment and Toshiba
which interfaces to the internal data bus. Each channel is 16 bits wide and operates at 400 MHz DDR (Double Data Rate). Combined, the two channels of DRDRAM
Emotion_Engine
Rate of modulation of a digital signal
symbol interval, achieving a data rate of double the symbol rate. In a more complex scheme such as 16-QAM, four bits of data are transmitted in each symbol
Symbol_rate
Flash memory card format
100 MHz clock with single data rate signaling to reach up to 50 MB/s; DDR50, a double data rate mode at 50 MHz that transfers data on both clock edges for
SD_card
MIPS microprocessor
supplemented by an optional tertiary cache built from single data rate (SDR) or double data rate (DDR) SSRAM or DDR SDRAM with capacities of 2 to 64 MB. The
R10000
Mobile data technology for GSM networks
more reduced latency and more than double performance, with a peak bit-rate of up to 1 Mbit/s. Enhanced Data rates for GSM Evolution is the common full
EDGE_(telecommunication)
Network standard
association. Original names for speeds were single-data rate (SDR), double-data rate (DDR) and quad-data rate (QDR) as given below. Subsequently, other three-letter
InfiniBand
Measure of the amount of data transferred per unit time
Memory bandwidth is the rate at which data can be read from or stored into a semiconductor memory by a processor. Memory bandwidth is usually expressed
Memory_bandwidth
Retrieved July 31, 2024. "Homicides drop by double digits for second year straight in Jackson, but rate of killings still ranks highest in nation". www
List of cities by homicide rate
List_of_cities_by_homicide_rate
Discontinued line of portable media players by Apple
the new nano is the memory system, featuring ... 512Mbits of mobile Double Data Rate (DDR) DRAM from Samsung "Fitness Updated". Apple.com. Retrieved November
IPod_Nano
Electronics industry recommendations
Configurations: JESD21-C | JEDEC". www.jedec.org. JEDEC, JESD790-E Double Data Rate (DDR) SDRAM Specification (PDF), archived from the original (PDF) on
JEDEC_memory_standards
Electronic non-volatile computer storage device
on 29 August 2009. Retrieved 21 September 2009. "Toshiba Introduces Double Data Rate Toggle Mode NAND in MLC And SLC Configurations" (Press release). Irvine
Flash_memory
Athlons use a double data rate (DDR) front-side bus, (EV-6) meaning that the actual data transfer rate of the bus is twice its physical clock rate. The FSB's
List_of_AMD_Athlon_processors
Concept in machine learning
Double descent in statistics and machine learning is the phenomenon where a model's error rate on the test set initially decreases with the number of parameters
Double_descent
Computer memory architecture
architecture use two 64-bit data channels. Dual-channel should not be confused with double data rate (DDR), in which data exchange happens twice per DRAM
Multi-channel memory architecture
Multi-channel_memory_architecture
Prefix indicating a power of two
528000000 B/s, which is usually quoted as 528 MB/s. A PC3200 memory on a double data rate bus, transferring 8 bytes per cycle with a clock speed of 200 MHz has
Binary_prefix
RISC microprocessor
same clock frequency as the SSRAM or at twice the clock frequency if double data rate SSRAM is used. The B-cache is direct-mapped. Branch prediction is performed
Alpha_21264
edge of the clock signal. With the advent of double data rate synchronous dynamic RAM or DDR SDRAM, the data was transmitted on both rising and falling
Pumping_(computer_systems)
"silent epidemic". In 2021, the global rate of suicide deaths for men was 12.3 per 100,000, more than double the rate for women, which stood at 5.9 per 100
List of countries by suicide rate
List_of_countries_by_suicide_rate
Line of CPUs by Intel
them had a 533 MHz front-side bus (FSB) connecting the CPU with the double-data rate synchronous dynamic random-access memory (DDR SDRAM). Intel developed
Pentium_Dual-Core
Multi-core microprocessor microarchitecture
adds support for up to 32 GB of slotted double data rate 2 memory, as well as dramatically improving double-precision floating-point performance on the
Cell_(processor)
Informal measure of rate of computer data operations
data transfer operations per second, the transfer rate, in a data-transfer channel. This is also known as the sample rate, i.e., the number of data samples
Transfers_per_second
Double Data Rate 3 Low-voltage Synchronous Dynamic Random Access Memory Reduced Standby (DDR3L-RS) is a low-voltage form of DDR3 SDRAM that also has a
DDR3L-RS
Facility used to house computer servers
from these data centers amounts to around 415 terawatt hours (TWh), about 1.5% of global electricity consumption in 2024, at a growth rate of 12% per
Data_center
Density DDE—Dynamic Data Exchange DDL—Data Definition Language DDoS—Distributed Denial of Service DE—Desktop environment DDR—Double Data Rate DEC—Digital Equipment
List of computing and IT abbreviations
List_of_computing_and_IT_abbreviations
Circuit board-microprocessor connection
motherboards unofficially supported FSB speeds up to 66MHz This is a double data rate bus. FSB in the later models. Slotkets are special adapters for using
CPU_socket
Form of computer data storage
KM48SL2000, which had a capacity of 16 Mbit. The first commercial double data rate SDRAM was Samsung's 64 Mbit DDR SDRAM, released in June 1998. GDDR
Random-access_memory
Time delay between data read command and availability of data in a computer's RAM
Transfer time = 1 / Data rate. Command rate = Data rate / 2 for double data rate (DDR), Command rate = Data rate for single data rate (SDR). Cycle time
CAS_latency
Brand of microprocessors by AMD
CPUs. The Athlon utilizes the Alpha 21264's EV6 bus architecture with double data rate (DDR) technology.[citation needed] AMD ended its long-time handicap
Athlon
NASA supercomputer at Ames Research Center/NAS
Harpertown processors connected with more than 20 miles of InfiniBand double data rate (DDR) cabling. With the addition of ten more racks of quad-core X5570
Pleiades_(supercomputer)
Type of computer memory
single read/write port, double data rate I/O. Quad Data Rate SRAM – synchronous, separate read and write ports, quadruple data rate I/O. Single-stack SRAM
Static_random-access_memory
Front-side bus by Hewlett-Packard
Runway+/Runway DDR: On PA-8500, PA-8600 and PA-8700, the bus operates in DDR (double data rate) mode, resulting in a peak bandwidth of about 2.0 GB/s (Runway+ or
Runway_bus
CPU socket for old AMD CPUs
clock-speeds between 600 MHz (Duron) to 2333 MHz (Athlon XP 3200+) Double data rate 100, 133, 166 and 200 MHz front-side bus on Duron, XP and Sempron processors
Socket_A
64-bit processor
floating-point instructions. The processor has two unidirectional 32-bit double data rate (DDR) buses (one for reads, the other for writes) to the system controller
PowerPC_970
American technology company
Rare, Blame Rambus - the Rare Witch Project Forums". Gervasi, Bill. "Double Data Rate SDRAM Takes on Rambus". DiscoBolusDesigns.com. Retrieved October 15
Rambus
Computer security exploit
2015. Retrieved March 11, 2015. "JEDEC standard JESD209-4A: Low Power Double Data Rate (LPDDR4)" (PDF). JEDEC. November 2015. pp. 222–223. Retrieved January
Row_hammer
Process for preserving information in DRAM
p. 819. ISBN 978-8120336797. EE Times teardown of iPhone 3G "JEDEC Double Data Rate (DDR) SDRAM Specification" (PDF). JESD79C. JEDEC Solid State Technology
Memory_refresh
Computer processor interconnection technology first introduced in 2001
"double data rate" connection, meaning it sends data on both the rising and falling edges of the clock signal. This allows for a maximum data rate of
HyperTransport
Memory used temporarily in data transfers
difference between the rate at which data is received and the rate at which it can be processed, or in the case that these rates are variable, for example
Data_buffer
Processor interconnect developed by Intel
clock, so the transfer rate is double the clock rate. Intel describes the data throughput (in GB/s) by counting only the 64-bit data payload in each 80-bit
Intel_QuickPath_Interconnect
highest modern rates in the data currently available, and crime had been on the decline since colonial times. Within the better data for crime reporting
Crime_in_the_United_States
Computer bus standard
was an asynchronous bus that accommodated devices with various transfer rates while maintaining a maximum throughput. It had 20 address lines so it could
Multibus
a double data rate (DDR) front-side bus meaning that the actual data transfer rate of the bus is twice its physical clock rate. The FSB's true data rate
List of AMD Athlon XP processors
List_of_AMD_Athlon_XP_processors
Process of encoding and decoding binary data to and from synthesized strands of DNA
error-correcting encoding scheme to ensure the extremely low data-loss rate, as well as the idea of encoding the data in a series of overlapping short oligonucleotides
DNA_digital_data_storage
Total number of live births per 1,000 divided by time period
Birth rate, also known as natality and crude birth rate, is the total number of live human births per 1,000 population for a given period divided by the
Birth_rate
Intel bus for connecting CPU and I/O chipset
isochronous data transfer capabilities. DMI replaced FSB (Front-Side Bus) which was eliminated in 2009. DMI 1.0, introduced in 2004 with a data transfer rate of
Direct_Media_Interface
Killing of a human by another human
November 2024. Data source: UNDP, Human Development Report (2024) ● Homicide data from "Homicide rate UNODC / Homicide rate, 2021". OurWorldInData.org. United
Homicide
Average lifetime number of children per woman
The total fertility rate (TFR) of a population is the average number of children that are born to a woman over her lifetime, if they were to experience
Total_fertility_rate
Ireland (e.g. the Double Irish, the Capital Allowances for Intangible Assets and the Section 110 SPV), to achieve an effective Irish CT rate, or ETR, of 0–2
Corporation tax in the Republic of Ireland
Corporation_tax_in_the_Republic_of_Ireland
Republik (German, "German Democratic Republic" (GDR), East Germany) Double Data Rate (s) East Germany (ISO 3166 trigram, obsolete since 1990) DDR&E – (i)
List_of_acronyms:_D
Extremely large or complex datasets
statistical power, while data with higher complexity (more attributes or columns) may lead to a higher false discovery rate. Big data analysis challenges include
Big_data
a double data rate (DDR) front-side bus, meaning that the actual data transfer rate of the bus is twice its physical clock rate. The FSB's true data rate
List_of_AMD_Duron_processors
Maximum rate of data transfer
bandwidth is the maximum rate of data transfer across a given path. Bandwidth may be characterized as network bandwidth, data bandwidth, or digital bandwidth
Bandwidth_(computing)
Maximum frequency of non-aliased component upon sampling
discrete sequence. It is named after Harry Nyquist. For a given sampling rate (samples per second), the Nyquist frequency (cycles per second) is the frequency
Nyquist_frequency
were double and triple rates as a letter's size increased. Ship fees were also added (i.e., mail to Hawaii). The ship fee, including the ship rate on letters
History of United States postage rates
History_of_United_States_postage_rates
Law predicting that bandwidth and data rates double every 18 months
predictable time lag. Edholm's law predicts that the bandwidth and data rates double every 18 months, which has proven to be true since the 1970s. The
Edholm's_law
Legal concept
as Blackstone's Ratio. In Canada, 2017–2018 data provided by Statistics Canada indicate an overall rate of conviction of 62% (of those charged in adult
Conviction_rate
Family of linear error-correcting codes
redundancy that Hamming codes add to the data, they can only detect and correct errors when the error rate is low. This is the case in computer memory
Hamming_code
Magnetic tape-based videocassette format for HD video
10 bit pixel depth. It also allows for 50 and 60p at the cost of a doubled data rate (440 Mbit/s for 60p). The Sony SRW-5800 HDCAM SR VTR has the ability
HDCAM
2026[update] provisional data, births to White American mothers remain around 50% of the U.S. total. Continuing declines in the fertility rates among Black American
Demographics of the United States
Demographics_of_the_United_States
Recording of information in a storage medium
for the growth rate of newly stored information (uncompressed) was more than 30% per year. In a more limited study, the International Data Corporation estimated
Data_storage
NASA Supercomputer
supercomputer. The nodes were connected with InfiniBand single and double data rate (SDR and DDR) cabling with transfer speeds of up to 10 gigabits per
Columbia_(supercomputer)
Frequency at which a display hardware displays a new image
with cathode-ray tubes (CRTs), the refresh rate, also known as vertical refresh rate, vertical scan rate or vertical frequency, is the number of times
Refresh_rate
Ratio used in computer memory
400 MHz since it is a DDR system ("DDR" stands for Double Data Rate; the effective memory clock speed is double the actual clock speed). The CPU will operate
Memory_divider
United States economy by president since World War II
average rate of 4.6 percent under Democratic presidents and 2.4 percent under Republicans ... The average income of Americans would be more than double its
U.S. economic performance by presidential party
U.S._economic_performance_by_presidential_party
DOUBLE DATA-RATE
DOUBLE DATA-RATE
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : nickname from Old French doubel ‘twin’ (literally ‘double’, from Late Latin duplus, classical Latin duplex, from du(o) ‘two’ + plek, a root meaning ‘fold’).
Female
English
 English surname transferred to unisex forename use, possibly DANA means "from Denmark." Compare with other forms of Dana.
Female
Slavic
 Short form of Slavic Bogdana, DANA means "gift from God." Compare with other forms of Dana.
Female
English
 Middle English name DARA means "brave, daring." Compare with another form of Dara.
Male
Iranian/Persian
 Short form of Persian Dârayavahush, DARA means "possesses a lot, wealthy." Compare with other forms of Dara.
Female
Hindi/Indian
(लता) Hindi name derived from a plant name, from the Sanskrit word lata, LATA means "creeper," in reference to a creeping plant.
Female
Polish
 Variant spelling of Polish Dyta, DITA means "rich battle." Compare with another form of Dita.
Male
Hebrew
Variant spelling of Hebrew Dathan, DATAN means "belonging to a fountain."
Female
Hungarian
 Short form of Hungarian Katalin, KATA means "pure." Compare with other forms of Kata.
Male
English
English surname transferred to unisex forename use, possibly DANA means "from Denmark."
Male
Irish
 From Irish Gaelic Mac Dara, DARA means "son of oak." Compare with other forms of Dara.
Female
Hebrew
(דִּיתָה) Pet form of Hebrew Yehuwdiyth, DITA means "Jewess" or "praised." Compare with another form of Dita.
Female
Russian
 Short form of Russian Yekaterina, KATA means "pure." Compare with other forms of Kata.
Female
Polish
Short form of Polish Edyta, DYTA means "rich battle."
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : variant of Double.In some cases, probably an altered spelling of South German Dobel or Döbel, a topographic name for someone who lived in a gorge or deep valley, Middle High German southern dialect tobel.
Female
Hebrew
(×“Ö¼Ö¸× Ö¸×”) Feminine form of Hebrew Dan, DANA means "judge." Compare with other forms of Dana.
Female
Finnish
Variant form of Finnish Aada, AATA means "noble."
Male
Turkish
Turkish name ATA means "ancestor."
Female
Finnish
 Short form of Finnish Katariina, KATA means "pure." Compare with other forms of Kata.
Male
Hebrew
(דֶּרַע) Hebrew name DARA means "the arm." In the bible, this is the name of a son of Zerah. Compare with other forms of Dara.
DOUBLE DATA-RATE
DOUBLE DATA-RATE
Surname or Lastname
English (southwestern)
English (southwestern) : occupational name for a servant, from Middle English hine ‘lad’, ‘servant’ (originally a collective term for a body of servants, from an Old English plural noun, hīwan ‘household’).Americanized spelling of German Hein.
Surname or Lastname
German
German : variant of Vogler.English : variant of Fowler.
Girl/Female
Hindu, Indian
God Name
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Precious
Boy/Male
Hindu, Indian, Sanskrit
Gift of Indra
Boy/Male
Tamil
Vamsidhar | வாமà¯à®¸à®¿à®¤à®°
Lord Krishna
Boy/Male
Biblical
The world, rustiness.
Boy/Male
Hindu
The one who can beat the Sun
Boy/Male
German Teutonic Polish Swedish
Brave adviser; honest advisor.
Boy/Male
Tamil
Harendra | ஹரேநà¯à®¤à¯à®°
Lord Shiva, A tree
DOUBLE DATA-RATE
DOUBLE DATA-RATE
DOUBLE DATA-RATE
DOUBLE DATA-RATE
DOUBLE DATA-RATE
n.
Among compositors, a doublet (see Doublet, 2.); among pressmen, a sheet that is twice pulled, and blurred.
v. t.
To load with a double charge, as of gunpowder.
v. t.
To double the natural darkness of (a place).
imp. & p. p.
of Double
n.
The state of being double or doubled.
n.
The fruit of the date palm; also, the date palm itself.
n.
One who, or that which, doubles.
n.
That which is doubled over or together; a doubling; a plait; a fold.
adv.
In a double degree; doubly.
a.
Double; doubled; reduplicative; repeated.
n.
Double-quick time, step, or march.
n.
A game between two pairs of players; as, a first prize for doubles.
n.
The act of one that doubles; a making double; reduplication; also, that which is doubled.
v. t.
To note or fix the time of, as of an event; to give the date of; as, to date the building of the pyramids.
a.
To increase by adding an equal number, quantity, length, value, or the like; multiply by two; to double a sum of money; to double a number, or length.
n.
Double beer; strong beer.
a.
To be the double of; to exceed by twofold; to contain or be worth twice as much as.
adv.
Twice; doubly.