Sha256: 676746e0f81451514b91bb708c02e450365a3e884c0c78c0d57e679e0f15fcc9
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Size: 921 Bytes
Versions: 91
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Stored size: 921 Bytes
Contents
require 'std/fsm.rb'
include HDLRuby::High::Std
# Implementation of an 8-bit calculator.
system :calculator do
input :clk,:rst
[1..0].input :opr
[7..0].input :x, :y
[7..0].output :s
output :zf, :sf, :cf, :vf
[8..0].inner :tmp
def common
s <= tmp[7..0]
zf <= (s == 0)
sf <= tmp[7]
cf <= tmp[8]
vf <= tmp[8] ^ tmp[7]
goto(:choice)
end
fsm(clk.posedge,rst) do
state(:zero) do
s <= 0;
zf <= 0;
sf <= 0;
cf <= 0;
vf <= 0;
end
state(:choice) do
goto(opr, :add,:sub,:neg, :zero)
end
state(:add) do
tmp <= x + y
common
end
state(:sub) do
tmp <= x - y
common
end
state(:neg) do
tmp <= -x
common
end
end
end
Version data entries
91 entries across 91 versions & 1 rubygems