why 3-wire spi have 4-prot ??

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originally posted by ashish+dec 20 2006, 06:54 pm--><div class='quotetop'>quote (ashish @ dec 20 2006, 06:54 pm)</div>

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<!--quotebegin-iztok.jeras@Dec 20 2006, 01:41 PM

which three signals? which signal is missing on the symbol? be verbose please?

izi

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In sopc when i try to configure nios as slave in avlon communication it has spi 3 wire serial

ss_n, sclk, miso

where is mosi and if we need it in our project how to get this 4th line...

thanks in advance...

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please also guide me on how to use nios 2 as a spi slave using sopc builder..

i am a newbie in it..

thanks fr ur response in advance....

please response as soon as possible