Hi everyone
I am referring to the DE4_SDCARD demo by Altera provided with DE-4 board and working in 1-bit SD mode.
When applying a block write operation using command CMD24 for example I am not getting SD card busy status so where after I can check CRC Ok response.
I mean to say after applying STOP bit, I assume the card must go busy for writing the data physically but just after applying next clock I am getting high '1' on the DAT0 line which means card is never gone busy for writing. However to my luck the data is also written down successfully but I still want to monitor the response of CRC check after sending STOP bit which I cannot in current scenario.

Please help me, the code snap is given below and problem is highlighted in line ////>>>>>>>>>>>>>>>


// write data (512byte = 1 block)
for(i=0;i<nDataLen;i++)
{
Data8 = szDataWrite[i];
for(j=0;j<8;j++)
{
SD_CLK_LOW;

if (Data8 & 0x80)
SD_DAT_HIGH;
else
SD_DAT_LOW;

SD_CLK_HIGH;
Data8 <<= 1;
}
}

// send CRC
j=0;
for(i=0;i<16;i++){
SD_CLK_LOW;
if (DataCrc16 & 0x8000)
SD_DAT_HIGH;
else
SD_DAT_LOW;

SD_CLK_HIGH;
DataCrc16 <<= 1;
}

// stop bits (value 'one')
SD_CLK_LOW;
SD_DAT_HIGH;
SD_CLK_HIGH;

////>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Just below code after STOP bit is already sent I am getting 0xff which means only 1's no zero indicating busy for sd card.

//===== check busy bits (data0 only)
SD_DAT_IN;
for(i=0; i<8; i++) //wait for response
{
SD_CLK_LOW;
SD_CLK_HIGH;
Response <<= 1;
if(SD_TEST_DAT) Response|=0x01;
}
printf("Response is: 0x%02x\n", Response); //Prints always 0xff


Please help me come out from this problem so I can check the CRC ok response on DAT0 line after STOP bit