TDA4VM MMC1_SDWP (SD CARD Write Protect)

YUTAI LI1

Other Parts Discussed in Thread: TDA4VM

Hi TI Support Team

TDA4VM EVB SCH (PROC078E7) the pin name: MMC1_SDWP / pin number: R28 .

1. This pin used as GPIO input (ENET_EXP_INTB). But the schematic arrow is output not input, Is it typo?

2. ENET_EXP_INTB have 100K PU to 3V3, but SDWP pin status high is write protected and your EVB board micro SD connector don't have WP signal.

So I want to know how to remove write protect for TDA4VM from your design.

Thanks

Yutai

over 5 years ago

0 Stanislav Stilyanov over 5 years ago

TI__Genius 17740 points

Hi Yutai,

1. I'm sorry, I don't know the purpose of ENET_EXP_INTB signal, so I won't be able to tell you the direction. Note however that on Common board (PROC079E2A(001)_SCH.pdf) this signal is directed to SoC.

2. Since MMC1 connector (J49) is microSD (no WP function on microSD cards) and MMC1_SDWP pin is muxed to GPIO, MMC1 controller will not sense the WP pin. The only action to take would be to tell MMC/SD software driver to not take into account the WP status (i.e. assume Write always enabled).

Regards,

Stan

0 YUTAI LI1 over 5 years ago in reply to Stanislav Stilyanov

Intellectual 400 points

Thanks, Stan

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TDA4VM MMC1_SDWP (SD CARD Write Protect)