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Bit and pin notation with colons

Cerb

Cerb

Elite Member
For example, bits/pins 23:8, or 15:0. What exactly is each side referencing? If it's start:end, why the backwards the counting (endianness?)?
 
Because assuming you are talking about an HDL, 23:8 is the same as saying 23 "down to" 8, which refers to bits from 23 to 8 excluding bits 7:0.
 
I'm reading data sheets and assembly language docs (RAM chips, LCD drivers, ADC chips, etc.), which assume I already know these things. Most of it I have been able to either look up or infer well enough, but that's been one that I haven't been able to nail down, that's used everywhere. Programming-centric docs stick to pseudo-C n<<m type notations, but I haven't come across any that have both for the same data sets...and making too much of a mistake could fry things, soon 🙂.
 
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