From d52d27e768e40de60c20b03405dc0431077bf76b Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sun, 13 Mar 2022 16:48:23 -0700
Subject: Adding packed keyword to structs and tweaking tag_t slightly.

---
 hdl/defs.svh | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/hdl/defs.svh b/hdl/defs.svh
index ea8dbc1..f8b1032 100644
--- a/hdl/defs.svh
+++ b/hdl/defs.svh
@@ -5,9 +5,11 @@
 
 `define PDP_ADDRESS_BITS    15
 
+`define NUM_PDPS            1
+
 `define UART_BYTE_BITS      8
 
-`define TAG_BITS            1
+`define TAG_BITS            $clog2(`NUM_PDPS+1)
 
 typedef bit             [`RAM_ADDRESS_BITS-1:0]                         ram_word_address_t;
 typedef bit             [`RAM_ADDRESS_BITS-1:$clog2(`RAM_LINE_WORDS)]   ram_line_address_t;
@@ -29,7 +31,7 @@ typedef bit             [`TAG_BITS-1:0]                                 tag_t;
 
 typedef bit             [`UART_BYTE_BITS-1:0]                           uart_byte_t;
 
-typedef struct {
+typedef struct packed {
     ram_line_address_t  address;
     bit                 write;
     ram_line_t          data;
@@ -37,22 +39,20 @@ typedef struct {
     tag_t               tag;
 } ram_command_t;
 
-typedef struct {
+typedef struct packed {
     ram_line_address_t  address;
     ram_line_t          data;
     tag_t               tag;
 } ram_read_response_t;
 
-typedef struct {
+typedef struct packed {
     pdp_line_address_t  address;
     bit                 write;
     ram_line_t          data;
     ram_line_mask_t     mask;
-    tag_t               tag;
 } pdp_command_t;
 
-typedef struct {
+typedef struct packed {
     pdp_line_address_t  address;
     ram_line_t          data;
-    tag_t               tag;
 } pdp_read_response_t;
-- 
cgit v1.2.3