diff --git a/doc/nativeJtag/usb_connect.cfg b/doc/nativeJtag/usb_connect.cfg
index e9da2fc..313b919 100644
--- a/doc/nativeJtag/usb_connect.cfg
+++ b/doc/nativeJtag/usb_connect.cfg
@@ -6,7 +6,7 @@ ftdi_layout_init 0x00e8 0x60eb
 ftdi_tdo_sample_edge falling
 
 reset_config none
-adapter_khz 50000
+adapter_khz 5000
 
 source [find cpld/xilinx-xc7.cfg]
 source [find cpld/jtagspi.cfg]