EE 675 Advanced Microprocessors ARM – A little history
EE 675 Advanced Microprocessors ARM – A little history
EE 675 Advanced Microprocessors ARM – A little history
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<strong>ARM</strong> register bank floorplan<br />
• Enable lines run vertically and data busses run horizontally<br />
• Decoders are more complex that the register cells but horizontal<br />
pitch is matched to register cells<br />
Vdd<br />
Vss<br />
ALU<br />
bus<br />
PC<br />
bus<br />
INC<br />
bus<br />
PC<br />
A bus read decoders<br />
B bus read decoders<br />
write decoders<br />
register cells<br />
ALU<br />
bus<br />
A bus<br />
B bus<br />
<strong>EE</strong> <strong>675</strong> @ SDSU 43<br />
<strong>ARM</strong> core datapath buses<br />
• Datapath pitch is chosen as a compromise between the complex<br />
functions (ALU) and simpler functions (barrel shifter)<br />
• Space is also allocated for the passage of passenger buses<br />
Ad<br />
PC inc<br />
shift out<br />
W<br />
instruction<br />
Din<br />
A B<br />
address register<br />
incrementer<br />
register bank<br />
multiplier<br />
ALU<br />
shifter<br />
data in<br />
instruction pipe<br />
data out<br />
<strong>EE</strong> <strong>675</strong> @ SDSU 44<br />
22
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