QSPI PSRAM for Teensy 4.0?

[ianloic]

The lovely little PSRAM chips that PJRC sells support QSPI and SPI. From staring at high-res photos of the Teensy 4.1 like they're wired up with QSPI on the 4.1, but on the audio board only the SPI pins are connected. And the pinout diagrams for the 4.0 and 4.1 only list regular SPI pins as being broken out.

Is it possible for me to build a board with memory chips that the Teensy can speak QSPI to?

Also, this is all premised on the idea that this would have some speed benefit, but maybe the limiting factor isn't going to be SPI speed.

[PaulStoffregen]

Is it possible for me to build a board with memory chips that the Teensy can speak QSPI to?

No, not with Teensy 4.0. The QSPI pins aren't accessible on Teensy 4.0. They're only available on Teensy 4.1.

Also, this is all premised on the idea that this would have some speed benefit, but maybe the limiting factor isn't going to be SPI speed.

Most audio projects use only the internal memory.