bus: ari: Add address operation structure

Signed-off-by: Ian M. <ian@aptel.org>

1 files changed, 18 insertions, 1 deletions

diff --git a/rtl/inc/bus/ari.svh b/rtl/inc/bus/ari.svh
index 86a3915..6c5a6e2 100644
--- a/rtl/inc/bus/ari.svh
+++ b/rtl/inc/bus/ari.svh
@@ -19,12 +19,29 @@ parameter PMA_XLEN          = 32;
 // ARI bus tags for determining payload type
 //
 // @ARI_NOP:  No-operation, as per the spec
+// @ARI_ADOP: Address operation
 //
 typedef enum logic [3:0] {
-    ARI_NOP
+    ARI_NOP,
+    ARI_ADOP
 } AriTag;
 
 //
+// Address operation structure
+//
+// @ad:         48-bit physical address
+// @data:       Data to write (if write_en=1)
+// @write_en:   If set, this is a write operation
+// @reserved:   Reserved, must be zero
+//
+typedef struct packed {
+    logic [PMA_XLEN-1:0] ad;
+    logic [63:0] data;
+    logic write_en;
+    logic [14:0] reserved;
+} AriAdop;
+
+//
 // Represents an ARI frame that encapsulates a payload.
 // Refer to the ARI specification.
 //