On The Move

 

Making the case for LLI


I wanted to make a few points about why you should think of implementing LLI (and M-PHY) in your next design.
But first, I want to invite you to a live webinar conducted by Synopsys and Arteris that will explain the implementation and best practices when implementing LLI.

Now, why should you consider LLI and for what purpose:

The MIPI alliance Low Latency interface (LLI) was released in February 2012. LLI spec defines an efficient and scalable chip-to-chip interface between companion chips to enable use cases such as memory sharing.


Why the need for Low Latency?

In order to allow memory sharing, the link between the ICs should experience small delay times when transferring data to enable access to data in speeds as close as possible to direct DDR connection to the same IC.


Is this use case mature?

Memory sharing is not a brand new concept. In fact, a proprietary interface called C2C is already used by various vendors to enable memory sharing between baseband processor and application processor. Here’s a list of key vendors that use C2C This proves the maturity and widespread of the memory sharing use case: Intel, Texas Instruments, Samsung, LG, ST–Ericsson, HiSilicon Technologies, and Via Telecom. The press release claims to have 10 customers and that was a year ago.
LLI is a standard interface specifying a scalable, lower pin count, reduced EMI interface compared to the proprietary C2C interface. And it is used primary to the same use case as C2C.


Is the specification ready?

The LLI specification was released back in February and M-PHY specification v1.0 was released last year. The M-PHY specification v2.0 was expected in June this year and provides enough maturity to design M-PHY for LLI application.


How do I implement?

Designing LLI is complex and requires a lot of know-how in interface and also in interconnect to make memory sharing possible.
I want to invite you to a live webinar conducted by Synopsys and Arteris that will explain the implementation and best practices when implementing LLI. We will also touch on the solution and encourage you to discuss it with us during the Q&A using another opportunity.
The webinar is on June 27th 9:00AM PST, please register and learn more details on how to use LLI in your next SoC design.


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