| Rev |
Log message |
Author |
Age |
Path |
| 57 |
Some bug fixes to the dhrystone benchmark, and some compile time defines for
the test bench processor. Of the most important note is the fix to detect
lockups on the debug/wishbone bus--that has been a real help in getting the
ZipCPU installed and the debugger working on the various boards I'm working
with. (i.e., it's helped me find and figure out why/when things haven't worked)
Of other note is the new 'G' key in the testbench code, to cause the test
bench to run without user interaction until the next keystroke. This is
very valuable in long programs, as it makes getting to/from breakpoints
easier (i.e. you don't have to wait as long, hit 'G', breathe, hit 'space'
and you're there). |
dgisselq |
3171d 18h |
/zipcpu/trunk |
| 56 |
Here's a bit of work in progress for getting the Zip CPU working on a XuLA2
board. Many changes include: the existence of a cpudefs.v file to control
what "options" are included in the ZipCPU build. This allows build control
to be separated from the project directory (one build for a XuLA2 board,
another for a Basys-3 development board). Other changes have made things
perhaps harder to read, but they get rid of warnings from XST.
A big change was the addition of the (* ram_style="distributed" *) comment
for the register set. This was necessary to keep XST from inferring a block
RAM and breaking the logic that was supposed to take place between a register
read and when it was used. |
dgisselq |
3171d 18h |
/zipcpu/trunk |
| 55 |
A test was added to double check whether carry following right shifts worked.
This was a necessary part of getting two cycle linear feedback shift register
operations working for a memory test on a XuLA2 board. With this, I can now
verify that such feedback registers work for pseudorandom number purposes. |
dgisselq |
3171d 18h |
/zipcpu/trunk |
| 54 |
This builds on the support for backslash character escapes in both single
and multicharacter expressions. Backslash character escapes are now
possible with quotations and backslashes, and the same code to interpret
the escapes is applied to both single and multicharacter sequences. |
dgisselq |
3171d 18h |
/zipcpu/trunk |
| 53 |
Updated the #include/#define directives to work properly for nested includes.
(They were supposed to work properly for nested includes before ... and didn't)
This fixes those bugs. |
dgisselq |
3171d 18h |
/zipcpu/trunk |
| 52 |
Added the capability to "see" character's encoded within a binary file,
by printing the character value(s) of each opcode (if they are printable)
on each line. |
dgisselq |
3171d 18h |
/zipcpu/trunk |
| 51 |
Added the capability to look at binary files and 'see' characters as they
are encoded in memory. |
dgisselq |
3171d 18h |
/zipcpu/trunk |
| 50 |
Dhrystone benchmark updates--added the copyright notice. (Oops!) |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 49 |
Final set of changes finishing the Dhrystone package. Dhrystone, as
implemented by hand in assembly, now works. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 48 |
Files added/updated to get Dhrystone benchmark to work. Several fixes
to the CPU in the process, 'cause it wasn't working. Stall-less ALU
ops now work better, to include grabbing the memory result as it comes out
of the memory unit and placing it straight into either ALU or memory unit
for the next instruction. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 47 |
Added some new graphics, includes the file for the Zip Bones system. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 46 |
A series of updates associated with getting Dhrystone to work. Includes
updates to getting multiple files to link/work together within the assembler,
as well as getting quoted quotations to work in the lexer, and better
include file support in the preprocessor. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 45 |
Library routines for 32-bit multiply and divide, both signed and unsigned. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 44 |
?? |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 43 |
Minor edits to the C++ testbench. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 42 |
Oops -- forgot to add the stack. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 41 |
Assembly file for the Dhrystone benchmark added. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 40 |
Quick update, updates the assembly for the new version of the assembler. |
dgisselq |
3181d 10h |
/zipcpu/trunk |
| 39 |
Here's the documentation update to support the pipelined read/writes of
the bus from the CPU, as well as the test file that proved they worked. |
dgisselq |
3184d 13h |
/zipcpu/trunk |
| 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 |
3184d 15h |
/zipcpu/trunk |
| 37 |
Fixed some minor spelling errors. |
dgisselq |
3193d 06h |
/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 |
3193d 19h |
/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 |
3210d 09h |
/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 |
3219d 13h |
/zipcpu/trunk |
| 33 |
Finally finished a first draft of the full specification! |
dgisselq |
3222d 12h |
/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 |
3222d 20h |
/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 |
3222d 21h |
/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 |
3222d 21h |
/zipcpu/trunk |
| 29 |
Not sure what this file was, but it isn't a part of the project anymore. |
dgisselq |
3223d 06h |
/zipcpu/trunk |
| 28 |
I got tired of running the make files across multiple directories, so I
built this makefile to coordinate building across each directory. |
dgisselq |
3223d 06h |
/zipcpu/trunk |
