### Chisel Tutorial - www-inst.eecs.berkeley.edu

2012-1-23 · Chisel datatypes are used to specify the type of values held in state elements or ﬂowing on wires. Whilehardware designs ultimately operate on vectors of binary digits, other more abstract representations forvalues allow clearer speciﬁcations and help the tools generate more optimal circuits. In Chisel, a raw col-lection of bits is represented by theBitstype. Signed and unsigned integers are considered subsets ofﬁxed-point numbers and are represented by typesFixandUFixrespectively. Signed ﬁxed-point numbers,including integers, are represented using two’s-complement format. Boolean values are represented as typeBool. Note that these types are distinct from Scala’s builtin types such asInt. Additionally, Chisel …

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