diff --git a/drivers/renesas/rcar/ddr/ddr_b/boot_init_dram.c b/drivers/renesas/rcar/ddr/ddr_b/boot_init_dram.c
index 1234fb6..ac83c9a 100644
--- a/drivers/renesas/rcar/ddr/ddr_b/boot_init_dram.c
+++ b/drivers/renesas/rcar/ddr/ddr_b/boot_init_dram.c
@@ -2080,8 +2080,8 @@
 	/* DBTR9.TRDPR : tRTP */
 	mmio_write_32(DBSC_DBTR(9), js2[js2_trtp]);
 
-	/* DBTR10.TWR : nWR + 1 */
-	mmio_write_32(DBSC_DBTR(10), js1[js1_ind].nwr + 1);
+	/* DBTR10.TWR : nWR */
+	mmio_write_32(DBSC_DBTR(10), js1[js1_ind].nwr);
 
 	/*
 	 * DBTR11.TRDWR : RL +  BL / 2 + Rounddown(tRPST) + PHY_ODTLoff -
diff --git a/drivers/renesas/rcar/ddr/ddr_b/boot_init_dram_regdef.h b/drivers/renesas/rcar/ddr/ddr_b/boot_init_dram_regdef.h
index dc153a6..56363eb 100644
--- a/drivers/renesas/rcar/ddr/ddr_b/boot_init_dram_regdef.h
+++ b/drivers/renesas/rcar/ddr/ddr_b/boot_init_dram_regdef.h
@@ -5,7 +5,7 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#define RCAR_DDR_VERSION	"rev.0.39"
+#define RCAR_DDR_VERSION	"rev.0.40"
 #define DRAM_CH_CNT		0x04
 #define SLICE_CNT		0x04
 #define CS_CNT			0x02