5748G SDHC response register

[safierhu]

if there anyone has the problem that in SDHC driver，MCU has sent the command and the SD card also response on the SDIO physical bus correctly，but the response register has no reaction remaining zero. I have checked the IO configuration and the signal on oscilloscope. Also, I have tried to write signal in data_buff register with polling mode, and the physical has no action with CLK normally.  I have no other ideas now, expect and grateful for someones response !

[safierhu]

I have solved the problem， as the description  in 5748G datasheet told that the CLK is an output pins, and I configured to follow, and the phenomenon was physical clock and transmit/receive command is  correct, bus there is nothing in response register. When I configure the CLK pin to complex input and output, the register can be worked. Maybe there something wrong with the description.