add gate for CSR read address #295
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* reduces switching activity (= dyn. power consumption) * minor control bus cleanup (ALU co-processor select)
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This small PR adds an AND-gate to the CSR read address bus. This eliminates unnecessary switching activity in the (large) CSR block as the read address is only propagated (from the instruction word) if there is an actual CSR access. (Somehow,) this also reduces area costs of the CSR system 😉