A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the signal traces short and away from noise sources. Use a decoupling capacitor (e.g., 0.1uF) close to the VCC pin.
Use a clock frequency of 50 MHz or less, and ensure that the slave select (SS) signal is asserted before sending data. Also, use a pull-up resistor (e.g., 1kΩ) on the SS line to prevent floating.
The device is rated for operation from -40°C to +85°C. However, it's recommended to operate within -20°C to +70°C for optimal performance and reliability.
Power up the device in the following sequence: VCC, then VIO, then clock and input signals. Power down in the reverse sequence. Ensure that VCC is stable before applying clock and input signals.
Use the Cypress Semiconductor's Quad-SPI Flash Programmer tool or a third-party programmer that supports the CYP15G0403DXB-BGXC. Ensure that the device is properly powered and connected to the programmer.