diff --git a/firmware/cpld/sgpio_if/README.md b/firmware/cpld/sgpio_if/README.md
index d4093020..44fe9a8c 100644
--- a/firmware/cpld/sgpio_if/README.md
+++ b/firmware/cpld/sgpio_if/README.md
@@ -22,6 +22,25 @@ To program the SVF file into the CPLD:
   required, and the "program" script below expects it to be at the relative
   path "bsdl/xc2c/xc2c64.bsd".
 
+Generate an XSVF
+================
+
+After generating a programming file:
+
+* In the ISE Project Navigator, "Processes: top - Behavioral" pane, double-click "Configure Target Device".
+* Click "OK" to open iMPACT.
+* Ctrl-N to create a "New Project".
+* "Yes" to automatically create and save a project file.
+* Select "Prepare a Boundary-Scan File", choose "XSVF".
+* Select file name "default.xsvf".
+* Click "OK" to start adding devices.
+* Assign new configuration file: "top.jed".
+* Right-click the "xc2c64a top.jed" icon and select "Erase". Accept defaults.
+* Right-click the "xc2c64a top.jed" icon and select "Program".
+* Right-click the "xc2c64a top.jed" icon and select "Verify".
+* Choose menu "Output" -> "XSVF File" -> "Stop Writing to XSVF File".
+* Close iMPACT.
+
 To Program
 ==========