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3.5.  Use of the OpenRISC 1000 l.nop Instruction

The OpenRISC 1000 no-operation instruction, l.nop (32'h1500_0000), can take an optional 16-bit immediate parameter, which forms the least significant 16-bits of the instruction word. This value is ignored by the CPU, but may be monitored by test benches

In ORPSoC this is used to provide I/O and control functions for the C code running on the processor.

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