diff --git a/slsDetectorServers/slsDetectorServer/include/XILINX_FMC.h b/slsDetectorServers/slsDetectorServer/include/XILINX_FMC.h
new file mode 100644
index 000000000..99647ef28
--- /dev/null
+++ b/slsDetectorServers/slsDetectorServer/include/XILINX_FMC.h
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: LGPL-3.0-or-other
+// Copyright (C) 2021 Contributors to the SLS Detector Package
+
+void XILINX_FMC_enable_all();
+void XILINX_FMC_disable_all();
\ No newline at end of file
diff --git a/slsDetectorServers/slsDetectorServer/src/XILINX_FMC.c b/slsDetectorServers/slsDetectorServer/src/XILINX_FMC.c
new file mode 100644
index 000000000..6d55d8c7f
--- /dev/null
+++ b/slsDetectorServers/slsDetectorServer/src/XILINX_FMC.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: LGPL-3.0-or-other
+// Copyright (C) 2021 Contributors to the SLS Detector Package
+#include "XILINX_FMC.h"
+#include "arm64.h"
+#include "clogger.h"
+#include <math.h>
+#include <stdbool.h>
+#include <unistd.h>
+
+// clang-format off
+#define FMC_BASE_PATH "/root/fmc/"
+#define FMC_VADJ_EN "FMC_VADJ_EN"
+#define FMCP_VADJ_EN "FMCP_VADJ_EN"
+#define FMCP_3V3_EN "FMCP_3V3_EN"
+#define FMC_3V3_EN "FMC_3V3_EN"
+#define FMC_12V_EN "FMC_12V_EN"
+#define FMCP_12V_EN "FMCP_12V_EN"
+
+static const char *fmc_files[] = {
+    FMC_VADJ_EN,
+    FMCP_VADJ_EN,
+    FMCP_3V3_EN,
+    FMC_3V3_EN,
+    FMC_12V_EN,
+    FMCP_12V_EN
+};
+// clang-format on
+
+void XILINX_FMC_enable_all() {
+    LOG(logINFOBLUE, ("enable FMC power\n"));
+    #ifdef VIRTUAL
+        return;
+    #endif
+    char full_path[64];
+    for (size_t i = 0; i < sizeof(fmc_files) / sizeof(fmc_files[0]); ++i) {
+        snprintf(full_path, sizeof(full_path), "%s%s", FMC_BASE_PATH, fmc_files[i]);
+        FILE *fp = fopen(full_path, "w");
+        if (fp == NULL) {
+            LOG(logERROR,("XILINX_FMC: enable Error\n"));
+            continue;
+        }
+
+        fprintf(fp, "1\n");
+        fclose(fp);
+    }
+}
+
+void XILINX_FMC_disable_all() {
+    LOG(logINFOBLUE, ("disable FMC power\n"));
+    #ifdef VIRTUAL
+        return;
+    #endif
+    char full_path[64];
+    for (size_t i = 0; i < sizeof(fmc_files) / sizeof(fmc_files[0]); ++i) {
+        snprintf(full_path, sizeof(full_path), "%s%s", FMC_BASE_PATH, fmc_files[i]);
+        FILE *fp = fopen(full_path, "w");
+        if (fp == NULL) {
+            LOG(logERROR,("XILINX_FMC: disable Error\n"));
+            continue;
+        }
+        fprintf(fp, "0\n");
+        fclose(fp);
+    }
+}
\ No newline at end of file
diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/CMakeLists.txt b/slsDetectorServers/xilinx_ctbDetectorServer/CMakeLists.txt
index fa72ff586..284c9b6fc 100644
--- a/slsDetectorServers/xilinx_ctbDetectorServer/CMakeLists.txt
+++ b/slsDetectorServers/xilinx_ctbDetectorServer/CMakeLists.txt
@@ -7,6 +7,7 @@ add_executable(xilinx_ctbDetectorServer_virtual
     ../slsDetectorServer/src/communication_funcs.c
     ../slsDetectorServer/src/arm64.c
     ../slsDetectorServer/src/XILINX_PLL.c
+    ../slsDetectorServer/src/XILINX_FMC.c
     ../slsDetectorServer/src/common.c
     ../slsDetectorServer/src/sharedMemory.c
     ../slsDetectorServer/src/loadPattern.c
diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/Makefile b/slsDetectorServers/xilinx_ctbDetectorServer/Makefile
index f08ac3792..487959d6f 100755
--- a/slsDetectorServers/xilinx_ctbDetectorServer/Makefile
+++ b/slsDetectorServers/xilinx_ctbDetectorServer/Makefile
@@ -23,7 +23,7 @@ DESTDIR		?= 	bin
 INSTMODE	= 	0777
 
 SRCS 		= 	slsDetectorFunctionList.c  
-SRCS		+=	$(main_src)slsDetectorServer.c $(main_src)slsDetectorServer_funcs.c $(main_src)communication_funcs.c $(main_src)arm64.c $(main_src)XILINX_PLL.c $(main_src)common.c $(main_src)/sharedMemory.c $(main_src)/loadPattern.c $(md5_dir)md5.c $(main_src)programViaArm.c $(main_src)LTC2620_Driver.c 
+SRCS		+=	$(main_src)slsDetectorServer.c $(main_src)slsDetectorServer_funcs.c $(main_src)communication_funcs.c $(main_src)arm64.c $(main_src)XILINX_PLL.c $(main_src)XILINX_FMC.c $(main_src)common.c $(main_src)/sharedMemory.c $(main_src)/loadPattern.c $(md5_dir)md5.c $(main_src)programViaArm.c $(main_src)LTC2620_Driver.c 
 
 OBJS 		= 	$(SRCS:.c=.o) 
  
diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer b/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer
deleted file mode 100755
index d28cb6db7..000000000
Binary files a/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer and /dev/null differ
diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
index 992d11f18..8598c0d80 100644
--- a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
@@ -10,6 +10,7 @@
 
 #include "LTC2620_Driver.h"
 #include "XILINX_PLL.h"
+#include "XILINX_FMC.h"
 
 #include "loadPattern.h"
 #ifdef VIRTUAL
@@ -405,6 +406,10 @@ void setupDetector() {
 
     LTC2620_D_SetDefines(DAC_MIN_MV, DAC_MAX_MV, DAC_DRIVER_FILE_NAME, NDAC,
                          NPWR, DAC_POWERDOWN_DRIVER_FILE_NAME);
+    
+    // power LTC2620 before talking to it:
+    XILINX_FMC_enable_all();
+
     LOG(logINFOBLUE, ("Powering down all dacs\n"));
     for (int idac = 0; idac < NDAC; ++idac) {
         setDAC(idac, LTC2620_D_GetPowerDownValue(), 0);
@@ -579,6 +584,7 @@ int powerChip(int on, char *mess) {
     } else {
         LOG(logINFOBLUE, ("Powering chip: off\n"));
         bus_w(addr, bus_r(addr) & ~mask);
+        XILINX_FMC_disable_all();
 
         chipConfigured = 0;