What is SPI idle pattern

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ussername

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Hello,
I couldn't find anything about (SPI) IDLE PATTERN except this thread. I see the pattern is some byte, and after receiving that the pin won't read any data. Is that right?
Does every bus/port standard possess something like that? And for starting reading data there is the same pattern?
 

In contrast to serial interfaces with embedded clock (like PCie, USB, Ethernet), there's no need for an idle pattern with SPI.
 

Exactly as you say. But I refer to my documentation again (HW_User_Guide, page 32).

 

I don't fully get it - the device transmit/receive that byte at the end of the message, and the data exchange stops, while the chip select is still active. So what is it good for? For receiver to know the end of the message? I thought this is made through synchronization with serial clock signal.
 

Or does it simply has the same function like CHIP SELECT, only "software" implemented?
 

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