diff --git a/src/ftdiJtagMPSSE.cpp b/src/ftdiJtagMPSSE.cpp
index 02e5efe..dfd5fd7 100644
--- a/src/ftdiJtagMPSSE.cpp
+++ b/src/ftdiJtagMPSSE.cpp
@@ -31,7 +31,8 @@ using namespace std;
 FtdiJtagMPSSE::FtdiJtagMPSSE(const FTDIpp_MPSSE::mpsse_bit_config &cable,
 			string dev, const string &serial, uint32_t clkHZ, int8_t verbose):
 			FTDIpp_MPSSE(cable, dev, serial, clkHZ, verbose), _ch552WA(false),
-			_write_mode(0), _read_mode(0)
+			_write_mode(MPSSE_WRITE_NEG),  // always write on neg edge
+			_read_mode(0)
 {
 	init_internal(cable);
 }
@@ -89,16 +90,10 @@ void FtdiJtagMPSSE::config_edge()
 	 * opposite edges must be used.
 	 * Not required with classic FT2232
 	 */
-	if (!strncmp((const char *)_iproduct, "Digilent USB Device", 19)) {
-		if (FTDIpp_MPSSE::getClkFreq() < 15000000) {
-			_write_mode = MPSSE_WRITE_NEG;
-			_read_mode = 0;
-		} else {
-			_write_mode = 0;
-			_read_mode = MPSSE_READ_NEG;
-		}
+	if (FTDIpp_MPSSE::getClkFreq() >= 15000000 &&
+			!strncmp((const char *)_iproduct, "Digilent USB Device", 19)) {
+		_read_mode = MPSSE_READ_NEG;
 	} else {
-		_write_mode = MPSSE_WRITE_NEG;
 		_read_mode = 0;
 	}
 }