diff --git a/libopenfpga/libpcf/src/io/pcf_reader.cpp b/libopenfpga/libpcf/src/io/pcf_reader.cpp
new file mode 100644
index 000000000..cb9259d83
--- /dev/null
+++ b/libopenfpga/libpcf/src/io/pcf_reader.cpp
@@ -0,0 +1,78 @@
+/******************************************************************************
+ * Inspired from https://github.com/genbtc/VerilogPCFparser
+ ******************************************************************************/
+#include <sstream>
+
+/* Headers from vtrutil library */
+#include "vtr_log.h"
+#include "vtr_assert.h"
+#include "vtr_time.h"
+
+/* Headers from openfpgautil library */
+#include "openfpga_digest.h"
+
+#include "pcf_reader.h"
+
+/* begin namespace openfpga */
+namespace openfpga {
+
+/**************************************************
+ * Constants
+ *************************************************/
+constexpr char COMMENT = '#';
+
+/********************************************************************
+ * A writer to output a repack pin constraint object to XML format
+ *
+ * Return 0 if successful
+ * Return 1 if there are serious errors when parsing data
+ * Return 2 if fail when opening files
+ *******************************************************************/
+int read_pcf(const char* fname,
+             PcfData& pcf_data) {
+  vtr::ScopedStartFinishTimer timer("Read " + std::string(fname));
+
+  /* Create a file handler */
+  std::ifstream fp(fname);
+  if (!fp.is_open()) {
+    VTR_LOG_ERROR("Fail to open pcf file '%s'!", fname);
+    return 2;
+  } 
+
+  int num_err = 0;
+
+  /* Get line by line */
+  std::string line;
+  while (std::getline(fp, line)) {
+    std::stringstream ss(line);
+    while (ss) {
+      std::string word;
+      /* TODO: Use command parser */
+      if (ss >> word) {
+        if (word.find("set_io") == 0) {
+          std::string net_name;
+          std::string pin_name;
+          ss >> net_name >> pin_name;
+          /* Decode data */
+          PcfIoConstraintId io_id = pcf_data.create_io_constraint(); 
+          pcf_data.set_io_net(io_id, net_name);
+          pcf_data.set_io_pin(io_id, pin_name);
+        } else if (word[0] == COMMENT) { // if it's a comment
+          break;  //or ignore the full line comment and move on
+        } else {
+          /* Reach unknown command, error out */
+          VTR_LOG_ERROR("Unknown command '%s'!\n", word.c_str());
+          num_err++;
+          break; //and move onto next line. without this, it will accept more following values on this line
+        }
+      }
+    }
+  }
+
+  if (num_err) {
+    return 1;
+  }
+  return 0;
+}
+
+} /* end namespace openfpga */