AM2432: LPDDR4

Mari Tsunoda

Part Number: AM2432
Other Parts Discussed in Thread: SYSCONFIG

Hi Team,

I received a question from my customer below about LPDDR4

I have a problem that the header file that generated the LPDDR4 configuration information according to the SDK procedure does not come back when the DDR start process is executed.
I followed the procedure in the following URL
software-dl.ti.com/.../DRIVERS_DDR_PAGE.html

Debugging in the SDK, after executing "Enable PI as the initiator for DRAM" and "Start PI init sequence" in LPDDR4_Start(), it checks if the INIT_DONE bit (0th bit) of PI_INT_STATUS_REG has completed initialization. bit of PI_INT_STATUS_REG, but the bit does not stand up.

What are the possible causes? Or, what are the conditions for the INIT_DONE bit to stand up?
(Examples of possible factors)
- Communication with LPDDR4 via PHY is not responding, so the bit does not stand.
- DDR setting information is incorrect.

Specific call stack information
DDR_Init
DDR_Start
LPDDR4_Start
LPDDR4_StartSequenceController
LPDDR4_PollAndAckIrq
LPDDR4_PollPhyIndepIrq /* Wait for PhyIndependent module to finish up ctl init sequence */

Best regards,

Mari Tsunoda

over 3 years ago

0 Aakash Kedia over 3 years ago

TI__Mastermind 26165 points

Hi Mari,

Is it a TI-EVM or a custom board ? If its a custom board, is the PHY same as the one on AM243-EVM (MT40A1G16KD-062EIT:E) ? Can you please share the DRAM part being used by the customer if its different ?

Thanks and Regards,
Aakash

0 Mari Tsunoda over 3 years ago in reply to Aakash Kedia

TI__Expert 5726 points

Hi Aakash,

Thanks for your quick response. Their DRAM is W66BP6NBUAFJ by Windbond. They also sent their sysconfig file (most settings are left at default).

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/908/LPDDR4_5F00_20220705.syscfg

Best regards,

Mari Tsunoda

0 Ming Wei over 3 years ago in reply to Mari Tsunoda

TI__Guru 56265 points

Hi Mari,

We have looped in our DDR expert for further help on the LPDDR issue.

Best regards,

Ming

0 Mari Tsunoda over 3 years ago in reply to Ming Wei

TI__Expert 5726 points

Hi,

I wanted to update everyone on the situation. They were able to connect to LPDDR4 after they updated the MCU+ SDK to v.08.03.00.18 from v.08.01.00.36.

Would you be able to tell me if there were any updates relevant to LPDDR4? As per the release notes, it seems like LPDDR4 was tested at 400MHz on the earlier version, so they believe there shouldn't be any issues before updating.

Best regards,

Mari

+1 Ming Wei over 3 years ago in reply to Mari Tsunoda

TI__Guru 56265 points

Hi Mari,

I am glad to hear the problem is resolved with the latest MCU+ SDK release.

The DDR driver has change significantly from 08.01.00.31 to 08.03.00.18:

C:\ti\mcu_plus_sdk_am243x_08_03_00_18\source\drivers\ddr\v0\soc\am64_am243x\board_lpddrReginit.h has been added

C:\ti\mcu_plus_sdk_am243x_08_03_00_18\source\drivers\ddr\v0\soc\am64_am243x\board_ddrReginit.h also has changed

C:\ti\mcu_plus_sdk_am243x_08_03_00_18\source\drivers\ddr\v0\ddr.c/h have been changed too.

Best regards,

Ming

0 Mari Tsunoda over 3 years ago in reply to Ming Wei

TI__Expert 5726 points

Hi Ming,

Thanks for your quick response. I have let them know about the changes.

-Mari

0 Mari Tsunoda over 3 years ago in reply to Ming Wei

TI__Expert 5726 points

Hi Ming,

Although this LPDDR4 issue was resolved, I was wondering, why were the changes were not indicated in the release notes of the MCU+SDK?

Best regards,

Mari

0 Ming Wei over 3 years ago in reply to Mari Tsunoda

TI__Guru 56265 points

Hi Mari,

I checked the release note for MC+ SDK 08.03.00. It does not include the changes for the LPDDR and DDR. I will file a JIRA ticket for documentation.

Best regards,

Ming

0 Mari Tsunoda over 3 years ago in reply to Ming Wei

TI__Expert 5726 points

Hi Ming,

Thanks for the update and for filing the ticket.

Are changes like this usually included in the release notes? (ie. Was this update just overlooked this time?)

Best regards,

Mari

0 Ming Wei over 3 years ago in reply to Mari Tsunoda

TI__Guru 56265 points

Hi Mari,

Yes. It should have been included in the release note. It got skipped this time somehow. I will make sure it does not happen again.

Best regards,

Ming

0 Mari Tsunoda over 3 years ago in reply to Ming Wei

TI__Expert 5726 points

Hi Ming,

My customer was worried that these changes are usually not included in the notes, so I will let them know that it is usually included! Thank you for your support on this thread!

Best regards,

Mari Tsunoda

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AM2432: LPDDR4