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Syntax in Design Note



Hello,

 

This is probably lame, but I have a syntax question.  In DN113 pg. 7 there is a typedef struct defined with what appears to be an assignment

typedef struct{

 

xxxx;

xxxx;

unsigned char VLEN : 3; 

xxxx;

xxx;

} DMA_DESC

 

(this assignment is repeated afterword and is also  in several include files).  Neither I nor anyone here has ever seen this before.  Does anyone know where I could be pointed to the definition of this syntax?

 

Thanks,