diff --git a/doc/constraints/ulx3s_v17patch.lpf b/doc/constraints/ulx3s_v17patch.lpf
index 79f969a..b73c27f 100644
--- a/doc/constraints/ulx3s_v17patch.lpf
+++ b/doc/constraints/ulx3s_v17patch.lpf
@@ -48,23 +48,23 @@ LOCATE COMP "btn[3]" SITE "W1"; # UP
 LOCATE COMP "btn[4]" SITE "V1"; # DOWN
 LOCATE COMP "btn[5]" SITE "U1"; # LEFT
 LOCATE COMP "btn[6]" SITE "Y2"; # RIGHT
-IOBUF  PORT "btn[0]" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[1]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[2]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[3]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[4]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[5]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[6]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
+IOBUF  PORT "btn[0]" PULLMODE=UP IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[1]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[2]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[3]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[4]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[5]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[6]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
 
 ## DIP switch "blinkey", "gpio" sheet
 LOCATE COMP "sw[0]" SITE "E8"; # SW1
 LOCATE COMP "sw[1]" SITE "D8"; # SW2
 LOCATE COMP "sw[2]" SITE "D7"; # SW3
 LOCATE COMP "sw[3]" SITE "E7"; # SW4
-IOBUF  PORT "sw[0]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "sw[1]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "sw[2]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "sw[3]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
+IOBUF  PORT "sw[0]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "sw[1]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "sw[2]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "sw[3]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
 
 ## SPI OLED DISPLAY SSD1331 (Color) or SSD1306 (B/W) "blinkey", "usb" sheet
 LOCATE COMP "oled_clk" SITE "P4";
diff --git a/doc/constraints/ulx3s_v20.lpf b/doc/constraints/ulx3s_v20.lpf
index cf60daf..ac21203 100644
--- a/doc/constraints/ulx3s_v20.lpf
+++ b/doc/constraints/ulx3s_v20.lpf
@@ -47,27 +47,27 @@ IOBUF  PORT "led[7]" PULLMODE=NONE IO_TYPE=LVCMOS33 DRIVE=4;
 LOCATE COMP "btn[0]" SITE "D6";  # BTN_PWRn (inverted logic)
 LOCATE COMP "btn[1]" SITE "R1";  # FIRE1
 LOCATE COMP "btn[2]" SITE "T1";  # FIRE2
-LOCATE COMP "btn[3]" SITE "R18"; # UP W1->R18
+LOCATE COMP "btn[3]" SITE "R18"; # UP
 LOCATE COMP "btn[4]" SITE "V1";  # DOWN
 LOCATE COMP "btn[5]" SITE "U1";  # LEFT
-LOCATE COMP "btn[6]" SITE "H16"; # RIGHT Y2->H16
-IOBUF  PORT "btn[0]" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[1]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[2]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[3]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[4]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[5]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "btn[6]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
+LOCATE COMP "btn[6]" SITE "H16"; # RIGHT
+IOBUF  PORT "btn[0]" PULLMODE=UP IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[1]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[2]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[3]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[4]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[5]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "btn[6]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
 
 ## DIP switch "blinkey", "gpio" sheet
 LOCATE COMP "sw[0]" SITE "E8"; # SW1
 LOCATE COMP "sw[1]" SITE "D8"; # SW2
 LOCATE COMP "sw[2]" SITE "D7"; # SW3
 LOCATE COMP "sw[3]" SITE "E7"; # SW4
-IOBUF  PORT "sw[0]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "sw[1]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "sw[2]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
-IOBUF  PORT "sw[3]" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;
+IOBUF  PORT "sw[0]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "sw[1]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "sw[2]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
+IOBUF  PORT "sw[3]" PULLMODE=DOWN IO_TYPE=LVCMOS33;
 
 ## SPI OLED DISPLAY SSD1331 (Color) or SSD1306 (B/W) "blinkey", "usb" sheet
 LOCATE COMP "oled_clk" SITE "P4";