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[/] [zipcpu/] [trunk/] - Rev 58

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Rev	Log message	Author	Age	Path
38	A couple of quick updates: - The Zip CPU now supports pipelined memory access at one clock per instruction (assuming all the instructions are in the cache) - There is now a 'zipbones' module to build a Zip System without peripherals. Any peripherals would then need to be external to the CPU. - Some bug fixes. Documentation changes coming shortly.	dgisselq	3131d 10h	/zipcpu/trunk/
37	Fixed some minor spelling errors.	dgisselq	3140d 01h	/zipcpu/trunk/
36	Lots of changes to increase processing speed and remove pipeline stalls. Removed the useless flash cache, replacing it with a proper DMA controller. "make test" in the main directory now runs a test program in Verilator and reports on the results.	dgisselq	3140d 14h	/zipcpu/trunk/
35	I updated the system diagram to reflect the new version that has a direct memory access controller, rather than the (useless) manual cache.	dgisselq	3157d 04h	/zipcpu/trunk/
34	Bunches of changes, although very little changed with the core itself. Regarding the core, some bugs were fixed within zipcpu.v (the CPU part of the core), so that the debugger can change the program counter. The debugger can now halt the CPU and then view, examine, and modify registers to include the program counter, although live changes to the CC register have not been tested. There was also a bug in the stall handling of the wishbone bus delay line. This has now been fixed. Moving outwards to the system, some parameters have been added to zipsystem to make it more configurable for whatever environment you might wish to place it within. Other minor clean ups have taken place, mostly to the internal documentation. Lots of changes, though, to the assembler. The big one is the implementation of #define macros, C style. Several buggy macros were in sys.i. These have been fixed. The Makefile has been adjusted so that the build of test.S, which depends upon sys.i, is now properly dependent upon sys.i for make purposes. Further, not only will zpp, the assembler preprocessor, handle #define macros, it will also recursive #defines. The assembler expression evaluator has also been updated to properly handle both operator precedence, as well as modulo arithmetic. The master system test file, test.S, found in the sw/zasm directory has been updated to reflect these new capabilities. (I really need to move it to the bench/asm directory, so you may expect that change sometime later.)	dgisselq	3166d 08h	/zipcpu/trunk/
33	Finally finished a first draft of the full specification!	dgisselq	3169d 07h	/zipcpu/trunk/
32	Updated the document to match the most recent changes to the CPU. Specifically, these include the re-instatement of the full SUB command with immediate offset, and ... others I cannot remember. The new document also describes what conditions create pipeline stalls, together with how many cycles each stall condition will create.	dgisselq	3169d 15h	/zipcpu/trunk/
31	README now comments on the relationship between the debugger and the test bench. (They came from the same code at one time ...)	dgisselq	3169d 16h	/zipcpu/trunk/
30	Here's a 20% increase in performance: We've gone from 0.44 clocks per instruction up to 0.53 clocks per instruction on the test.S testset. The cost? Oh, only about 300 slices. Not bad. The specification document will also soon be updated with a list of conditions that create stalls, as eliminating stalls was how I managed to get the performance up like I did.	dgisselq	3169d 16h	/zipcpu/trunk/
29	Not sure what this file was, but it isn't a part of the project anymore.	dgisselq	3170d 01h	/zipcpu/trunk/

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