Embedded SDIO 3.0 shared bus

Based on SDIO spec v3.0 I have some doubts.
a.
SDIO 2.0 can support 7 function in one card. And these 7 functions all
share 
1 CLK , 1 CMD and 4 DAT lines ,right?

b.
SDIO 3.0 have a new feature that is embedded SDIO.It's "shared bus"
feature.
It used 7 CLK pin and 1 CMD and 4 DAT(8 is optional) lines for 7
functions,right?

c.
I wonder what different it is? Just only increase clock pins for embedded  
 SDIO or etc?

d.
How do it work at choosing function between v2.0 and v3.0?Use CMD52 or
Clock? 


	   
					
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