Open-Silicon .:. ASICs Memory Bandwidth Issue Fix Offered…
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ASICs Memory Bandwidth Issue Fix Offered…

3D harnesses 1,024-bit wide pathways

— R. Colin Johnson, Advanced Technology Editor, EE Times
10/1/2015 08:51 AM EDT
PORTLAND, Ore.—Application specific integrated circuits (ASICs) are often limited by the bandwidth they can achieve with double-data-rate (DDR) off-chip memory architectures. Now ASIC-maker Open-Silicon (Milpitas, Calif.) claims to have solved that problem by integrating high-bandwidth memory (HBM) 3D stacked memory chips into the same system-in-package (SiP) with a 1,024-bit parallel memory interface that beats any off-chip memory architectures.

“We are offering 3D memory stacks integrated into the ASIC package using silicon interposer 2.5D technology,” Hans Bouwmeester, vice president of IP and Engineering Operations at Open-Silicon told EE Times in an exclusive interview. “The result is higher performance, lower power and a smaller form factor–a three way win.”


Open Silicon’s high-bandwidth memory (HBM) enables 1024-bit wide memory paths to application specific integrated circuits (ASICs) using 3D system in a package (SiP) solution.


Anyone with an ASIC idea can improve its access to memory–especially compared with DDR version four (DDR4)–by applying Open-Silicon’s HBM SiP approach including the necessary IP and using JEDEC-compliant HBM memory chips, which come in stacked-die 3D versions.

Open-Silicon uses an interposer that allows 1,024-bit parallel paths to connect the memory to the ASIC in extremely close proximity for bandwidth that rivals putting the memory on the ASIC die itself, but without the expense and low yields that would otherwise result.


Open Silicon’s high-bandwidth memory (HBM) intellectual property (IP) subsystem block diagram shows how stacked Known Good Dies (KGDs) interface to application specific integrated circuits (ASICs) that include an integral IEEE 1500 testing interface.


Yields are high because “we only put pretested known-good ASICs onto the interposer with pretested known good 3D HBM memory die stacks in our SiPs, making yields very high,” Bouwmeester told EE Times.

The customer gets the advantage of using their own custom logic, while Open-Silicon provides all the HBM IP for putting their ASIC together with JEDEC-compliant HBM memory chips. Most of Open-Silicon’s customers with bandwidth and power constrained systems are in high-performance computing, networking, high-end consumer, and graphics applications all of which will be benefit from HBM ASIC SiP, according to the company.

— R. Colin Johnson, Advanced Technology Editor, EE Times

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