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30 lines
845 B
Markdown
30 lines
845 B
Markdown
# External code for SummerCart64 Firmware
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This folder contains code downloaded directly from external repositories with minor modifications.
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## qflexpress.v
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### Source
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[https://github.com/ZipCPU/qspiflash/blob/master/rtl/qflexpress.v](https://github.com/ZipCPU/qspiflash/blob/master/rtl/qflexpress.v)
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### Documentation
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There's [comprehensive documentation](https://zipcpu.com/blog/2019/03/27/qflexpress.html) for this module:
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### Modifications
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- Changed initialization sequence.
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- Extended address space for 16-bit address alignment.
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## wbsdram.v
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### Source
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[https://github.com/ZipCPU/arrowzip/blob/master/rtl/arrowzip/wbsdram.v](https://github.com/ZipCPU/arrowzip/blob/master/rtl/arrowzip/wbsdram.v)
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### Modifications
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- Changed refresh interval that suits 90 MHz clock and used SDRAM chip.
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- Changed column and row address widths.
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