1. GV7600 or GV7601 does not work at all Check 1) All power supply voltages The voltage on VCO_VDD pin is about 0.7~0.8V. The serial resistor should be 105 ohm (or you can use 100 ohm), not 1M (10x105) ohm. 2) Is there a 1ms low pulse on RESETb pin after power on? After that, is RESETb high? 3) Is STANDBY pin low? 4) Is JTAG_EN pin low? 5) Are GV7600 D5, F7, H8 pins connected ..