using spi core

[Altera_Forum]

I want to use the spi core for adc peripheral AD9253. It has bidirectional SDIO. but spi core in nios has miso and mosi. so how do i tackle this. i want to read and write to the adc registers.

[Altera_Forum]

A simple solution is driving SDIO in open collector mode using a tristate i/o buffer and a pull-up resistor. 

MOSI is connected to the active low buffer enable port, while the i/o buffer input is hardwired to gnd. MISO is connected to the same i/o pin. This way you simply put ones in the spi tx register for the bits you are supposed to receive.

[Altera_Forum]

--- Quote Start ---  A simple solution is driving SDIO in open collector mode using a tristate i/o buffer and a pull-up resistor. MOSI is connected to the active low buffer enable port, while the i/o buffer input is hardwired to gnd. MISO is connected to the same i/o pin. This way you simply put ones in the spi tx register for the bits you are supposed to receive.  --- Quote End ---   Hello, sherindeena! Did You try to make it this way? Here are another replies to this question:  http://www.alteraforum.com/forum/showthread.php?t=26838 http://www.alteraforum.com/forum/showthread.php?t=38228 Which one is correct?  I am interested because I am about to make the similar connection.

[Altera_Forum]

--- Quote Start ---  Hello, sherindeena! Did You try to make it this way? Here are another replies to this question:  http://www.alteraforum.com/forum/showthread.php?t=26838 http://www.alteraforum.com/forum/showthread.php?t=38228 Which one is correct?  I am interested because I am about to make the similar connection.  --- Quote End ---    i just left the unused line unconnected. i didnt read back the registers.