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< system = System(cpu = cpus, physmem = SimpleMemory())
< system.clock = options.sys_clock
---
> system = System(cpu = cpus, physmem = SimpleMemory(),
> clk_domain = SrcClockDomain(clock = '1GHz'))
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> # Create a seperate clock domain for components that should run at
> # CPUs frequency
> system.cpu.clk_domain = SrcClockDomain(clock = '2GHz')
>
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> # Create a separate clock domain for Ruby
> system.ruby.clk_domain = SrcClockDomain(clock = options.ruby_clock)
>