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replace AXI with OBI and remove QSPI #3

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* Changed AXI to OBI

* Changed to one FSM

* Changed names in the axi_spi_slave file and
changes due to running hello-world

* Integrated the perpheral into x-heep

* Removed rready

* Impemented changes to the OBI FSM as discussed in the meeting

* Impemented changes to the OBI FSM as discussed in the meeting

* Removed the quadspi function

* removed quad_spi

* Added back the wrap_length and increase address
features

* Adapted the module inputs and outputs to fit
with x-heep i/o signals

* removed warnings and errors when simulating

* added the waver file in the core file

* Updated code to make the simulation work

* Fixed small issue with the simulation

* final minor changes to the IP

* Optimized the SPI slave FSM
@davideschiavone davideschiavone marked this pull request as draft January 10, 2025 07:32
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