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MMC doesn't work.

Other Parts Discussed in Thread: DM3730

Hi, We are trying to talk to wi-fi module over MMC3 with DM3730.

wifi module needs to be configured by 1.8V.

but MMC3 doen't work. We proved with scope, and MMC3CLK only output about 0.7V with sevaral pulse(about 400kHz).

MMCCMD and MMCDAT output 1.8V. so We proved clock signal(MMC3CLK or MMC2CLK) under the following condition

① DM3730 talking to wi-fi module over MMC2. (We proved MMC2CLK)

 ② MMC3CLK pin isn't connected wi-fi module. (NC)(We proved MMC2CLK)

①and②, MMC3CLK or MMC2CLK only output about 0.7V with sevaral pulse, too.

 

is there any reason what MMC get into situations such as the ones above?

 

regards,

 

 s kawasaki