What is the difference between the qspi interface and the ordinary four-wire SPI interface?

qspi interface: data appears on 4 data lines when reading and writing data.The ordinary spi interface only has data on one line.The rate of qspi is 4 times that of ordinary SPI.

If the mcu has a spi controller, if it supports qspi, then he has a register that can be set, and the setting is currently a single line output data.Still 4 lines of output data.

Therefore, in essence, operating qspi and ordinary spi, this is the difference in programming, only to set single-line output or 4-line output before output, there is no difference in other.