Other Parts Discussed in Thread: AM3352
Hi champs,
customer runs into problems:
They use the AM3351 with MMC0.CLK – G19 (MuxMode0); MMC0.CMD- G17 (MuxMode0); MMC0.D0 – G18 (MuxMode0); ….
All further description are tested with an eMMC 8GB and 4GB as well with pSLC Mode from the Toshiba eMMCs THGBM series.
After pSLC Mode, the eMMC capacity was reduced to its half.
Now the problem is, after sending the comand CMD1 the SD_Register of the eMMCs CTO and ERRI are set and the MMCs are not have any response to the CPU.
But if we do a hard wire connection to the Pins: V14 – MMC1-CLK; (U15 - MMC1-CMD; W10 – MMC-D0 are required to get the pSLC Mode) we are able connect to the eMMC.
That means, a connection from CLK MMC1 to CLK MMC0 and we can connect, write, read and boot from the eMMC on MMC0.
But the CLK Pin from MMC1 is High-Z all the time.
We tried some other things with no success.
- Pull-Up at CLK.MMC0
- Capacity at CLK.MMC0
- Hard wire from eMMC.CLK to MMC0.CLK (parallel to the PCB)
Customer is running out of ideas. Any ideas for root cause ?
