From: Jean THOMAS <git0@pub.jeanthomas.me>
Date: Mon, 27 Jul 2020 13:10:58 +0000 (+0200)
Subject: Add Precharge-For-Refresh state
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7beb11e5c3183de30b9f781aeda701410d15575c;p=gram.git

Add Precharge-For-Refresh state
---

diff --git a/gram/core/bankmachine.py b/gram/core/bankmachine.py
index ad289d6..d956aac 100644
--- a/gram/core/bankmachine.py
+++ b/gram/core/bankmachine.py
@@ -176,7 +176,10 @@ class BankMachine(Elaboratable):
         with m.FSM():
             with m.State("Regular"):
                 with m.If(self.refresh_req):
-                    m.next = "Refresh"
+                    with m.If(row_opened):
+                        m.next = "Precharge-For-Refresh"
+                    with m.Else():
+                        m.next = "Refresh"
                 with m.Elif(cmd_buffer.source.valid):
                     with m.If(row_opened):
                         with m.If(row_hit):
@@ -216,6 +219,20 @@ class BankMachine(Elaboratable):
                     with m.If(self.cmd.ready):
                         m.next = "tRP"
 
+            with m.State("Precharge-For-Refresh"):
+                m.d.comb += row_close.eq(1)
+
+                with m.If(twtpcon.ready & trascon.ready):
+                    m.d.comb += [
+                        self.cmd.valid.eq(1),
+                        self.cmd.ras.eq(1),
+                        self.cmd.we.eq(1),
+                        self.cmd.is_cmd.eq(1),
+                    ]
+
+                    with m.If(self.cmd.ready):
+                        m.next = "Refresh"
+
             with m.State("Autoprecharge"):
                 m.d.comb += row_close.eq(1)