diff --git a/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf b/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
index 1589d24..76727f5 100644
--- a/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
+++ b/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
@@ -21,7 +21,7 @@ CONFIG STEPPING = "ES";
 
 # Bus clock nets
 NET "clk" TNM_NET = "clk";
-TIMESPEC "TS_clk" = PERIOD "clk" 9.95 ns HIGH 50 %;
+TIMESPEC "TS_clk" = PERIOD "clk" 9.9 ns HIGH 50 %;
 
 NET "inst_vga_frontend/inst_vga_backend/inst_clkgen/vga_clk0" TNM_NET = "vga_clk";
 #TIMESPEC "TS_vga_clk" = PERIOD "vga_clk" 7.5 ns HIGH 50 %;
@@ -37,6 +37,9 @@ NET "rst" TIG;
 NET "sys_clk_in" CLOCK_DEDICATED_ROUTE = FALSE;
 PIN "inst_clockgen/inst_DCM_BASE_0.CLKIN" CLOCK_DEDICATED_ROUTE = FALSE;
 
+NET "sys_sdr_clk_fb" CLOCK_DEDICATED_ROUTE = FALSE;
+PIN "inst_clockgen/inst_DCM_BASE_0.CLKFB" CLOCK_DEDICATED_ROUTE = FALSE;
+
 # Locate DCM/BUFG - Tools can probably figure them out automatically
 #                   but just LOC them down to be safe
 #INST inst_ddr_sdr/ctrl.inst_DCM_BASE_0 LOC = DCM_ADV_X0Y2;
@@ -381,7 +384,7 @@ NET sys_flash_d<0>  LOC = AD13;
 NET sys_flash_rdn     LOC = AC6;
 NET sys_flash_wrn     LOC = AB6;
 NET sys_flash_ce      LOC = W7;
-NET sys_flash_rstn    LOC = AD10;
+NET sys_flash_ac97_rstn    LOC = AD10;
 NET sys_flash_byten   LOC = N22;
 
 NET sys_flash_a<*> IOSTANDARD = LVDCI_33;
@@ -405,10 +408,10 @@ NET sys_flash_ce           IOSTANDARD = LVDCI_33;
 NET sys_flash_ce SLEW = FAST;
 NET sys_flash_ce DRIVE = 8;
 
-NET sys_flash_rstn    IOSTANDARD = LVCMOS33;
-NET sys_flash_rstn    DRIVE = 8;
-NET sys_flash_rstn    SLEW = FAST;
-NET sys_flash_rstn    TIG;
+NET sys_flash_ac97_rstn    IOSTANDARD = LVCMOS33;
+NET sys_flash_ac97_rstn    DRIVE = 8;
+NET sys_flash_ac97_rstn    SLEW = FAST;
+NET sys_flash_ac97_rstn    TIG;
 
 NET sys_flash_byten    IOSTANDARD = LVCMOS33;
 NET sys_flash_byten    DRIVE = 8;
@@ -482,3 +485,16 @@ NET sys_vga_sync_n LOC = L23;
 NET sys_vga_sync_n SLEW = FAST;
 NET sys_vga_sync_n DRIVE = 8;
 NET sys_vga_sync_n IOSTANDARD = LVCMOS33;
+
+#------------------------------------------------------------------------------
+# IO Pad Location Constraints / Properties for AC97 Sound Controller
+#------------------------------------------------------------------------------
+
+NET sys_ac97_bit_clk   LOC = AE10;
+NET sys_ac97_bit_clk   IOSTANDARD = LVCMOS33;
+NET sys_ac97_bit_clk   PERIOD = 80;
+NET sys_ac97_sdata_in  LOC = AD16;
+NET sys_ac97_sdata_in  IOSTANDARD = LVCMOS33;
+NET sys_ac97_sdata_out LOC = C8;
+NET sys_ac97_ssync     LOC = D9;
+