AM62P: Shmoo plots for LPDDR4.

Greetings Lenio,

Gentle FYI, this plot is from a version of the tool for Jacinto devices. The version that supports AM62P is here: https://www.ti.com/tool/download/DDR-MARGIN-FW/

That being said, they both function essentially the same, though the output itself differs slightly on if this picture is from a read eye vs a write eye:

1) Each vertical tick is a different DQ VREF setting in either the DDR IP or DRAM and these settings can be roughly translated into a % of VDDQ. Each horizontal tick is a different delay setting relating to a percent of a clock cycle.

2) It's color coded by failure rate, which is the number in each box. Green-> Red in terms of increasing failure rate.

3) The numbers are obtained through on silicon measurements. This excel report is generated from a script, which takes in output from a piece of firmware running on silicon. The firmware will test various combinations of VREF and delay and then report how much failing data was seen at each combination tested.

Sincerely,

Lucas

Greetings Lenio,

I do not have any dates for that unfortunately, but yes there will eventually be finished documentation. The main focus of development currently is getting the tooling into customer hands and ensuring all of our present and future devices are supported on the variety of customer use-cases we see.

Sincerely,

Lucas