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// Creator: Dan Gisselquist, Ph.D.
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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// Gisselquist Technology, LLC
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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// Copyright (C) 2015-2016, Gisselquist Technology, LLC
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// Copyright (C) 2015-2019, Gisselquist Technology, LLC
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//
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//
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// This program is free software (firmware): you can redistribute it and/or
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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// your option) any later version.
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//
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//
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// The first couple options control the Zip CPU instruction set, and how
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// The first couple options control the Zip CPU instruction set, and how
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// it handles various instructions within the set:
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// it handles various instructions within the set:
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//
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//
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//
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//
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// OPT_ILLEGAL_INSTRUCTION is part of a new section of code that is supposed
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// to recognize illegal instructions and interrupt the CPU whenever one such
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// instruction is encountered. The goal is to create a soft floating point
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// unit via this approach, that can then be replaced with a true floating point
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// unit. As I'm not there yet, it just catches illegal instructions and
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// interrupts the CPU on any such instruction--when defined. Otherwise,
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// illegal instructions are quietly ignored and their behaviour is ...
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// undefined. (Many get treated like NOOPs ...)
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//
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// I recommend setting this flag so highly, that I'm likely going to remove
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// the option to turn this off in future versions of this CPU.
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//
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`define OPT_ILLEGAL_INSTRUCTION
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//
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//
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//
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//
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// OPT_MULTIPLY controls whether or not the multiply is built and included
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// OPT_MULTIPLY controls whether or not the multiply is built and included
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// in the ALU by default. Set this option and a parameter will be set that
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// in the ALU by default. Set this option and a parameter will be set that
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// includes the multiply. (This parameter may still be overridden, as with
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// includes the multiply. (This parameter may still be overridden, as with
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// any parameter ...) If the multiply is not included and
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// any parameter ...) If the multiply is not included and
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`define OPT_TRADITIONAL_PFCACHE
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`define OPT_TRADITIONAL_PFCACHE
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//
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//
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//
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//
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//
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//
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//
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//
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// OPT_DCACHE enables a CPU data cache for (hopefully) better performance
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// in terms of speed. It requires telling the CPU which parts of memory
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// can be cachable in terms of three separate address regions: one for the
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// SDRAM, one for the flash, and another for the block RAM.
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//
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`define OPT_DCACHE
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//
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//
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//
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// OPT_PIPELINED_BUS_ACCESS controls whether or not LOD/STO instructions
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// OPT_PIPELINED_BUS_ACCESS controls whether or not LOD/STO instructions
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// can take advantaged of pipelined bus instructions. To be eligible, the
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// can take advantaged of pipelined bus instructions. To be eligible, the
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// operations must be identical (cannot pipeline loads and stores, just loads
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// operations must be identical (cannot pipeline loads and stores, just loads
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// only or stores only), and the addresses must either be identical or one up
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// only or stores only), and the addresses must either be identical or one up
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// from the previous address. Further, the load/store string must all have
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// from the previous address. Further, the load/store string must all have
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//
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//
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`endif // OPT_DOUBLE_FETCH
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`endif // OPT_DOUBLE_FETCH
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`endif // OPT_SINGLE_FETCH
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`endif // OPT_SINGLE_FETCH
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//
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//
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//
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//
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// [EXPERIMENTAL--and not (yet) finished]
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// OPT_MMU determines whether or not an MMU will be included in the ZipSystem
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// containing the ZipCPU. When set, the ZipCPU will route all memory accesses
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// through the MMU as an address translator, creating a form of Virtual memory.
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//
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// `define OPT_MMU
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//
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//
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// Now let's talk about peripherals for a moment. These next two defines
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// Now let's talk about peripherals for a moment. These next two defines
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// control whether the DMA controller is included in the Zip System, and
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// control whether the DMA controller is included in the Zip System, and
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// whether or not the 8 accounting timers are also included. Set these to
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// whether or not the 8 accounting timers are also included. Set these to
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// include the respective peripherals, comment them out not to.
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// include the respective peripherals, comment them out not to.
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