Updated Redundancy Cells dependency and used new features.

Author: Maurus Item

Bender.yml

@@ -8,7 +8,7 @@ package:
 dependencies:
   common_cells: {git: "https://github.com/pulp-platform/common_cells.git",         version: 1.21.0}
   fpu_div_sqrt_mvp: {git: "https://github.com/pulp-platform/fpu_div_sqrt_mvp.git", version: 1.0.4}
-  redundancy_cells: { git: "[email protected]:Lynx005F/redundancy_cells.git", rev: d1bc37491a9ca17383ded5c17eb2f40a6e42674a}
+  redundancy_cells: { git: "[email protected]:Lynx005F/redundancy_cells.git", rev: 68e741c2628db25825d0545de7f13fc0366e3854}
 
 sources:
   - src/fpnew_pkg.sv

src/fpnew_pkg.sv

@@ -327,11 +327,12 @@ package fpnew_pkg;
 
   // Different kinds of Redundancy that might be used
   typedef enum logic [2:0] {
-    NONE,       // No redundancy module is generated - redundancy can not be enabled
-    TMR_FAST,   // Operands will be tripplicated in time - if nothing goes wrong output after 2 cycles (longer critical path)
-    TMR_SMALL,  // Operands will be tripplicated in time - always output after 3 cycles (shorter critical path)
-    DMR,        // Operands will be duplicated in time and are retried on failure
-    DMR_INORDER // Operands will be duplicated in time and are retried on failure - always keeps the order of outputs the same
+    NONE,        // No redundancy module is generated - redundancy can not be enabled
+    TMR_FAST,    // Operands will be tripplicated in time - if nothing goes wrong output after 2 cycles (longer critical path)
+    TMR_SMALL,   // Operands will be tripplicated in time - always output after 3 cycles (shorter critical path)
+    DMR,         // Operands will be duplicated in time and are retried on failure
+    DMR_INORDER, // Operands will be duplicated in time and are retried on failure - always keeps the order of outputs the same
+    TMR_TINY     // Operands will be tripplicated in time, storage is deferred to handshake (might cause stalls)
   } redundancy_type_t;
 
   // FPU configuration: redundancy

src/fpnew_top.sv

@@ -83,8 +83,13 @@ module fpnew_top #(
     $clog2(MAX_DELAY) +
     // In case of a TMR approach we add extra ID Bits for the Division since it can take up to 12 cycles
     // For DMR this is not needed as we stall the unit instead
-    ((RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_FAST || RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_SMALL) 
-      && fpnew_pkg::division_enabled(Implementation.UnitTypes)
+    (
+      (
+        RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_FAST  || 
+        RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_SMALL || 
+        RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_TINY 
+      ) && 
+      fpnew_pkg::division_enabled(Implementation.UnitTypes)
     ) ? 4 : 0
   );
 
@@ -162,7 +167,11 @@ module fpnew_top #(
     // Stall Handshake when a division is going on and DMR is enabled
     logic division_stall;
 
-    if (RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_FAST || RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_SMALL) begin: gen_no_division_stall
+    if (
+      RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_FAST  || 
+      RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_SMALL ||
+      RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_TINY
+    ) begin: gen_no_division_stall
       assign division_stall = 0;
     end else begin: gen_division_stall
       logic division_busy_q;
@@ -206,11 +215,16 @@ module fpnew_top #(
     assign retry_ready = fpnew_pkg::DONT_CARE;
     assign retry_replacement_id = fpnew_pkg::DONT_CARE;
 
-  end else if (RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_FAST || RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_SMALL) begin: gen_in_tmr
+  end else if (
+    RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_FAST  || 
+    RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_SMALL ||
+    RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_TINY
+  ) begin: gen_in_tmr
     time_TMR_start #(
-        .DataType           ( tmr_in_stacked_t                         ),
-        .IDSize             ( ID_SIZE                                  ),
-        .InternalRedundancy ( RedundancyFeatures.TripplicateRepetition )
+        .DataType           ( tmr_in_stacked_t                                                   ),
+        .IDSize             ( ID_SIZE                                                            ),
+        .InternalRedundancy ( RedundancyFeatures.TripplicateRepetition                           ),
+        .EarlyReadyEnable   ( (RedundancyFeatures.RedundancyType != fpnew_pkg::TMR_TINY) ? 1 : 0 )
     ) i_time_TMR_start (
         .clk_i,
         .rst_ni,
@@ -274,7 +288,8 @@ module fpnew_top #(
         .DataType           ( tmr_in_stacked_t                         ),
         .IDSize             ( ID_SIZE                                  ),
         .InternalRedundancy ( RedundancyFeatures.TripplicateRepetition ),
-        .UseExternalId      ( 1                                        )
+        .UseExternalId      ( 1                                        ),
+        .EarlyReadyEnable   ( 1                                        ) // Low area overhead, always enable (If retry gets it as feature remove here)
     ) i_time_DMR_start (
         .clk_i,
         .rst_ni,
@@ -439,7 +454,11 @@ module fpnew_top #(
     assign retry_valid = fpnew_pkg::DONT_CARE;
     assign retry_lock = fpnew_pkg::DONT_CARE;
 
-  end else if (RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_FAST || RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_SMALL) begin : gen_out_tmr
+  end else if (
+    RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_FAST  || 
+    RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_SMALL || 
+    RedundancyFeatures.RedundancyType == fpnew_pkg::TMR_TINY
+  ) begin : gen_out_tmr
     time_TMR_end #(
         .DataType           ( tmr_out_stacked_t                                                  ),
         .LockTimeout        ( LOCK_TIMEOUT                                                       ),