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HI
We used AM3352BZCZD80 and want to make the simulation of DDR.
And the supporter who help us for simulating need some information as below
1. Controller model including package parts (need RLC data)
(e.g. single IBIS file including package parts)
(e.g. IBIS file w/o package parts, and need EBD/ PKG model)
2. Controller specification
(e.g. Need CK timing, command-control-address timing,
read and write cycle timing of data strobe (DQS) and data (DQ/ DM))
3. Controller driver model
(Controller Ron settings of CK/ ADD/ CMD & CTRL, model name must the
same as IBIS file)
4. Controller driver and ODT model
(Controller driving settings of DQS/ DQ & DM with write cycle; ODT
settings of DQS & DQ with read cycle, model name must the same as
IBIS file)
5. DRAM MRS configuration and setting by controller (list as below)
(DRAM ODT settings of DQS/ DQ & DM with write cycle; driving
settings of DQS/ DQ with read cycle)
thank you.
Hi,
Thanks for your query. I will check on this and get back to you.
regards,
-Shriram
Hi,
Pl refer the AM3352 IBIS model at the below link available at ti.com:
https://www.ti.com/lit/zip/sprm552
This should contain all of the information relevant to TI collateral, including package RLC etc. Pl refer the memory datasheet for the relevant details of the memory on your design.
regards,
-Shriram
Just to clarify, the package RLC is at the bottom part of the IBIS model and can be obtained by searching for "resistance matrix", "inductance matrix" etc. The I/O settings for the controller can be obtained by searching for the respective "Selector_xx" based on the "model name" column in the package section.
I already sent this file to them. but they still need some setting . ex. MRS setting. We didnt modified this part in our system , so we think that will be default. can you give us default setting? And they gave me some information they need as below. please help us for answering those part. thank you.
Hi,
Can you pl clarify exactly what is being requested here and for what purpose?
As I had mentioned, the IBIS model already contains the pkg RLC information. We do not provide a separate EBD model for the design since package RLC already includes the RLC for each trace as well as the parasitic matrix.
Regarding the controller and DRAM settings, are you asking for the ODI and ODT settings used for simulations?
regards,
-Shriram
I knew all information in the IBIS model, but I dont know which one I used . I dont know how to use IBIS because so many model in IBIS. Like what you said , I asked for the ODI and ODT settings used for simulation. and which one PLC in IBIS is I exactly used? thank you.
Hi,
Pl refer the below link for a couple of things which should answer your question:
1. https://www.ti.com/lit/zip/sprcah7 (This is a spreadsheet for calculating overall DDR budget)
2. https://www.ti.com/lit/pdf/SPRACK4 (This is a PDF app note specific to AM335x family of devices which can be used in conjunction with the above sheet and contains specific instructions on completing the same for AM3352)
regards,
-Shriram
We discussed with simulation company and they cannot decide which model to use from all the models in IBIS.
Here please find the spread sheet created for the firmware setting and contains DDR3 related information.
Could you tell from the setting to recommend which model to be used for DDR simulation? There are too many choices for one signal.
6685.AM335x_EMIF_Configuration_Tool_v3.xlsx
BR, Rich
Rich, we would recommend to use whichever model provides best eye margins for the customer board in their signal integrity simulations.
regards,
-Shriram
Shriram,
May you advise which model is used for AM335x EVM if for simulation?
Customer default hardware and SW setting is similar to EVM.
BR, Rich
Hi Rich,
Shriram is out-of-office and will respond to your question once he returns in 2 weeks.
Regards,
Melissa
Hi Rich,
Can you confirm which model you are referring to?
Is this the model selector in the IBIS model for the DDR controller in AM335x?
I am asking since the term "model" could refer to either IBIS model or board model for EVM.
regards,
-Shriram
Shriram,
I meant IBIS model, not board model.
I was asking which IBIS model number we used for EVM simulation since there are very model number for DDR (different characteristic).
Customer wants us to suggest which one we used for simulation.
BR, Rich
Rich,
Thanks for your patience. We are checking to see what would be the best way to get you the information you need.
regards,
-Shriram