Sha256: 1c227b7d76f9704356eea32402eb8024a05651e2be1ab2e58f74496426281c10
Contents?: true
Size: 924 Bytes
Versions: 9
Compression:
Stored size: 924 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
9 entries across 9 versions & 1 rubygems