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MCR register is not readable from address `UART_REG_MC. The following fix :
`UART_REG_MS : wb_dat_o = msr;
`UART_REG_SR : wb_dat_o = scratch;
default: wb_dat_o = 8'b0; // ??
endcase // case(wb_addr_i) changed to : `UART_REG_MS : wb_dat_o = msr;
`UART_REG_SR : wb_dat_o = scratch;
`UART_REG_MC : wb_dat_o = {4'b000, mcr };
default: wb_dat_o = 8'b0; // ??
endcase // case(wb_addr_i)
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