From f2783a4fe3e54b7e43137cafa70063b1094aff2d Mon Sep 17 00:00:00 2001
From: Tobias Platen <tplaten@posteo.de>
Date: Wed, 27 May 2020 11:27:06 +0200
Subject: [PATCH] elaborate function for DataMerger

---
 src/soc/experiment/l0_cache.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/soc/experiment/l0_cache.py b/src/soc/experiment/l0_cache.py
index de6b4ca3..e9fdfcd8 100644
--- a/src/soc/experiment/l0_cache.py
+++ b/src/soc/experiment/l0_cache.py
@@ -190,6 +190,23 @@ class DataMerger(Elaboratable):
         self.data_i = Array(ul)
         self.data_o = DataMergerRecord()
 
+        def elaborate(self, platform):
+            m = Module()
+            comb, sync = m.d.comb, m.d.sync
+            #(1) pick a row
+            m.submodules.pick = pick = PriorityEncoder(self.array_size)
+            pick.i.eq(0)
+            for j in range(self.addr):
+                with m.If(self.addr_match_i[j]>0):
+                    pick.i.eq(pick.i||(1<<j))
+            valid = ~pick.n
+            idx = pick.o
+            #(2) merge
+            self.data_o.eq(0)
+            for j in range(self.array_size):
+                with m.If(self.addr_match_i[idx][j] && valid):
+                    self.data_o.eq(self.data_i[j]|self.data_o)
+
 
 class LDSTPort(Elaboratable):
     def __init__(self, idx, regwid=64, addrwid=48):
-- 
2.30.2