1 files 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;