From efe110e830ca9e0def822fb43c28be16c081893c Mon Sep 17 00:00:00 2001
From: "N. Engelhardt" <nakengelhardt@gmail.com>
Date: Thu, 29 Mar 2018 19:20:17 +0800
Subject: [PATCH] Ensure Memory that has a port with async_read=True is
 actually implemented as distributed ram

---
 migen/fhdl/specials.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/migen/fhdl/specials.py b/migen/fhdl/specials.py
index a182bbf84..78fe3d347 100644
--- a/migen/fhdl/specials.py
+++ b/migen/fhdl/specials.py
@@ -278,6 +278,11 @@ def gn(e):
                 return verilog_printexpr(ns, e)[0]
         adrbits = bits_for(memory.depth-1)
 
+        for port in memory.ports:
+            if port.async_read:
+                r += "(* ram_style = \"distributed\" *) "
+                break
+
         r += "reg [" + str(memory.width-1) + ":0] " \
             + gn(memory) \
             + "[0:" + str(memory.depth-1) + "];\n"