APB user signalling

[rishyak]

We are definitely not implementing this right now

---

• Recommended that it's not used
• Not defined in APB protocol
• Causes interoperability problems if two components use the same signals
• Can only be added to APB5 protocol interfaces

---

Starter code:

interface APBCommon_if #(
  // Truncated
  UserReqWidth = 32,
  UserDataWidth = DataWidth/2,
  UserRespWidth = 16 
) (
  input clk,
  input nReset
);

  // Truncated
  logic wakeUp; 
  logic [UserReqWidth - 1:0] aUser;
  logic [UserDataWidth - 1:0] wUser;
  logic [UserDataWidth - 1:0] rUser;
  logic [UserRespWidth - 1:0] bUser;

  // Truncated

endinterface

[rishyak]

Differences in opinion are encouraged.