Hi Shiou Mei,
Continue the previous thread: TDA4VM: The Samsung emmc can't be identified on HS200 mode - Processors forum - Processors - TI E2E support forums,
1.The first problem is emmc can not found .
When trying to grab the waveform again, the problem cannot be reproduced. It can be reproduced when the oscilloscope probe is not connected and cannot be reproduced when the probe is connected.
The probe: we use the differential probe and the signal-ended probe
Is there any way to solve it?
2.The second problem is about the emmc test.
Read data from emmc:
The clk have the 22R series resistance between the SOC and emmc,and the data have 33R.
Test the emmc in 200MHz.we found the setup time less than 1.4ns,does not meet the requirements.
Change the 22R to 0R in clk,we found the setup time can meet the requirements.
Can change the delay or IO drive in somewhere?
Read the data is fail if CMD connect the probe, is there any other way to solve it?
Write data to emmc:
The clk have the 22R series resistance between the SOC and emmc,and the data have 33R.
Test the emmc in 200MHz.Write the data is fail if DATA or CMD connect the probe, is there any other way to solve it?
Thanks!











































