i.MX Processorsのトピック4GB LPDDR4 failed calibration on iMX8M Plus

4GB LPDDR4 failed calibration on iMX8M Plus

Zhirong_Yang — Mon, 31 Mar 2025 11:50:57 GMT

Hi NXP Team,

Our iMX8M Plus Quad Core based board was previously load with 2GB LPDDR4 (MT53E512M32D1ZW-046) and has been working normally, but recently we build a batch of 4GB LPDDR4 (MT53E1G32D2FW-046) board, and it failed DDR calibration ' Step 2' as show in below.

============ Step 2: DDR memory accessing... ============
Verifying DDR frequency point0@2000MHz......Address of failure: 0x0000000040080000
Data read was: 0x4007FFE000000000
But pattern was: 0x0000000040000000
Failed
Please modify DDRC/DFI parameters!!!

Please someone can help how to fix this issue?

Re: 4GB LPDDR4 failed calibration on iMX8M Plus

JorgeCas — Mon, 31 Mar 2025 15:51:05 GMT

Hello,

You could try to change the tunning with different settings and check if helps with your design:

ODTImpedance

Desired ODT impedance in Ohm. Valid values for DDR4=240,120,80,60,40. Valid values for DDR3L=high-impedance,120,60,40. Valid values for LPDDR4=240,120,80,60,40

TxImpedance

Write Driver Impedance for DQ/DQS in ohm (Valid values for all DDR type= 240, 120, 80, 60, 48, 40, 34)

ATxImpedance

Write Driver Impedance for Address/Command (AC) bus in ohm (Valid values for all DDR type = 120, 60, 40, 30, 24, 20)

Best regards.

Re: 4GB LPDDR4 failed calibration on iMX8M Plus

Zhirong_Yang — Tue, 01 Apr 2025 09:13:42 GMT

@JorgeCas ,

We tried different ATx, ODT, Tx Impedance combinations and no improvement.

Is there any other way?

Re: 4GB LPDDR4 failed calibration on iMX8M Plus

JorgeCas — Tue, 01 Apr 2025 14:58:49 GMT

Hello,

If you still have this issue, the root cause could be layout issues since electrical characteristics between each memory could vary.

Please confirm that you are using the correct settings for the new memory.

Also, please try to use the latest tool version.

Best regards.