From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 16 Jul 2018 16:40:36 +0000 (+0200)
Subject: soc/integration/sdram_init: use fixed burst_length for each memtype (even in 1:2... 
X-Git-Tag: 24jan2021_ls180~1673
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7ecdcaca4b87378e0bda3c3092072df7cbdf9fd6;p=litex.git

soc/integration/sdram_init: use fixed burst_length for each memtype (even in 1:2, use BL8 for DDR3 since BL4 is not efficient)
---

diff --git a/litex/soc/integration/sdram_init.py b/litex/soc/integration/sdram_init.py
index 8ca1db00..edd6c0d4 100644
--- a/litex/soc/integration/sdram_init.py
+++ b/litex/soc/integration/sdram_init.py
@@ -68,7 +68,7 @@ const unsigned int sdram_dfii_pix_rddata_addr[{n}] = {{
     cl = sdram_phy_settings.cl
 
     if sdram_phy_settings.memtype == "SDR":
-        bl = sdram_phy_settings.nphases
+        bl = 1
         mr = log2_int(bl) + (cl << 4)
         reset_dll = 1 << 8
 
@@ -83,7 +83,7 @@ const unsigned int sdram_dfii_pix_rddata_addr[{n}] = {{
         ]
 
     elif sdram_phy_settings.memtype == "DDR":
-        bl = 2*sdram_phy_settings.nphases
+        bl = 4
         mr  = log2_int(bl) + (cl << 4)
         emr = 0
         reset_dll = 1 << 8
@@ -100,7 +100,7 @@ const unsigned int sdram_dfii_pix_rddata_addr[{n}] = {{
         ]
 
     elif sdram_phy_settings.memtype == "LPDDR":
-        bl = 2*sdram_phy_settings.nphases
+        bl = 4
         mr  = log2_int(bl) + (cl << 4)
         emr = 0
         reset_dll = 1 << 8
@@ -117,7 +117,7 @@ const unsigned int sdram_dfii_pix_rddata_addr[{n}] = {{
         ]
 
     elif sdram_phy_settings.memtype == "DDR2":
-        bl = 2*sdram_phy_settings.nphases
+        bl = 4
         wr = 2
         mr = log2_int(bl) + (cl << 4) + (wr << 9)
         emr = 0
@@ -141,7 +141,7 @@ const unsigned int sdram_dfii_pix_rddata_addr[{n}] = {{
             ("Load Extended Mode Register / OCD Exit", emr, 1, cmds["MODE_REGISTER"], 0),
         ]
     elif sdram_phy_settings.memtype == "DDR3":
-        bl = 2*sdram_phy_settings.nphases
+        bl = 8
 
         def format_mr0(bl, cl, wr, dll_reset):
             bl_to_mr0 = {