XDR™ DRAM
XDR DRAM(eXtreme Data Rate DRAM ) is based on XDR memory interface technology developed by Rambus and offers several innovative techniques that include ODR(Octal Data Rate), DRSL(Differential Rambus Signaling Level) and etc.
As a result, XDR DRAM achieves an order of magnitude higher performance than today's standard memories.
XDR DRAM has three speed grades, ranging from 2.4GHz to 4.0GHz, with the expectation that data transfer speeds will rise to 8.0GHz in the near future.
- ODR(Octal Data Rate) : Transfer eight bits of data per clock cycle
- DRSL(Differential Rambus Signaling Level) : High speed point-to-point, bi-directional Rambus Signaling Level using ultra-low 200mV signal swing
- highest frequency memory
- 4.0/3.2/2.4Gbps speed with max. 8.0GB/s
sustained bandwidth - More head room for expandability
- 4.0/3.2/2.4Gbps speed with max. 8.0GB/s
- highly effective memory bandwidth
- Large number of banks (8 banks)
- Efficient operation for different bank-set (Even/Odd)
- Zero refresh overhead
- most reliable features
- Differential & small (200mV) signaling scheme
(low power) - DRSL - Reduce noise & EMI
- Differential & small (200mV) signaling scheme
- low latency
- Point-To-Point data connection for fastest
flight time - Low-latency, Fast-cycles cores
- Point-To-Point data connection for fastest
- cost-effective features
- Small pin-count
- Easy PCB design
- Low frequency of CLK and CMD
- Wide ball pitch of 1.27mm (4-layer PCB Possible)
- green product (RoHS)
- Lead-Free
- Halogen Free
XDR DRAM is best memory solution for wide-ranging applications including video console games, digital televisions, computer servers, workstations and other applications where high bandwidth and low latency are required.
computer products, PC workstations and servers
System memory bandwidth is more important than ever before. The increase in processor performance, multimedia and 3D graphics, high bandwidth memory is essential to sustain system performance.
XDR DRAM provides exceptional performance with low latency for these applications
Consumer products demand the highest levels of performance to give life-like animation to game consoles, and high-quality digital imaging in digital HDTVs, and high-speed encoding/decoding in set-top boxes.
[ XDR DRAM advantage in consumer applications ]
- Smaller # of Devices : XDR DRAM(1pcs) vs. DDR2 (4pcs)
- Smaller ASIC pin count : XDR DRAM(~74pin) vs. DDR2(~248pin)
- Easy PCB routing
- Offer more capacity(x2/x4/x8 device) & more performance (4.0Gbps)
Network processor requires high bandwidth memory for packet buffering. XDR DRAM support high speed DRAM storage with small I/O and reliable signal
| XDR RAM | RDRAM | DDR-RAM | ||||||
|---|---|---|---|---|---|---|---|---|
| 2.4Gbps | 3.2Gbps | 4.0Gbps | PC-800 | PC1066 | DDR-333 | DDR-400 | DDR-533 | |
| Higher performance with lower cost using XDR DRAM | ||||||||
| base DRAM clock speed |
300MHz | 400MHz | 500MHz | 400MHz | 533MHz | 166MHz | 200MHz | 266MHz |
| bits per cycle | 8 | 8 | 8 | 2 | 2 | 2 | 2 | 2 |
| width | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| peak bandwidth | 4.8GB/s | 6.4GB/s | 8.0GB/s | 1.6GB/s | 2.1GB/s | 0.7GB/s | 0.8GB/s | 1.1GB/s |
XDR DRAM has outstanding speed per I/O pin.
In consequence, the system can be improved its performance with lower density and lower pin count.
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