Thank you for your reply.
It's important to mention that the LPC546xx and LPC541xx don't have a specific HS-SPI controller like the LPC55xx does. The SPI communication on the LPC546xx and LPC541xx is done through the Flexcomm peripheral and both have a maximum data rate of 48Mbit/s in master mode. The SPI examples can be found at the corresponding SDK of each device.
Regarding the USB examples, each SDK has USB Mass storage examples.
Let me know if this is helpful, if you have more questions do not hesitate to ask me.
Best regards,
Omar