diff --git a/cores/gameboy/gb.qsf b/cores/gameboy/gb.qsf
index de2abac..98fd57b 100644
--- a/cores/gameboy/gb.qsf
+++ b/cores/gameboy/gb.qsf
@@ -311,4 +311,5 @@ set_global_assignment -name VHDL_FILE t80/T80_Pack.vhd
 set_global_assignment -name VHDL_FILE t80/T80_ALU.vhd
 set_global_assignment -name VHDL_FILE t80/GBse.vhd
 set_global_assignment -name VHDL_FILE t80/T80_MCode.vhd
+set_location_assignment PLL_1 -to pll|altpll_component|auto_generated|pll1
 set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
\ No newline at end of file
diff --git a/cores/gameboy/gb_mist.v b/cores/gameboy/gb_mist.v
index e8eda65..27c85a5 100644
--- a/cores/gameboy/gb_mist.v
+++ b/cores/gameboy/gb_mist.v
@@ -486,6 +486,6 @@ pll pll (
 	 .locked(pll_locked)
 );
 
-assign SDRAM_CLK = ~clk64;
+assign SDRAM_CLK = clk64;
 
 endmodule