| Rev |
Log message |
Author |
Age |
Path |
| 69 |
This implements the "new Instruction Set" architecture for the Zip CPU. It's
a massive change set, that touches just about everything but probably not
enough of everything. Please see the spec.pdf for a description of this
new architecture. |
dgisselq |
3052d 18h |
/zipcpu/trunk |
| 68 |
Updated specification, includes well illustrated pipeline discussion. |
dgisselq |
3087d 18h |
/zipcpu/trunk |
| 67 |
Includes timing diagrams in support of a very descriptive specification section. |
dgisselq |
3087d 18h |
/zipcpu/trunk |
| 66 |
Adjusted the support for the DEBUG_SCOPE within these so that it can be
compiled in, or not, based upon an external build configuration file: cpudefs.v.
That allows me to make that file project specific, while the rest of the CPU
is shared among all projects. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 65 |
Lots of logic simplifications to the core, in addition to better support for
illegal instruction detection and bus error detection. The biggest change
had to deal with pushing the debug write interface into the ALU write
processing path. This simplifies the logic of adjusting the PC and CC
registers primarily, but also any writes to other registers. It also delays
these register writes by a clock, but since the debug interface is already
ridiculously slow I doubt that matters any. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 64 |
Shuffled some comments into here from elsewhere. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 63 |
Simplified bus interactions, and added support for detecting illegal
instructions (i.e. bus errors) in the pipefetch routine. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 62 |
Simplified the subtraction logic, so the carry bit no longer depends on
a separate 32-bit operation but becomes part of the subtract operation. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 61 |
Simplified the bus delay logic. Depends upon the stall line being irrelevant
outside of a bus cycle. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 60 |
Fixed assembler processing of jump instructions, so that the new fast
return instruction can be used. The test file was modified to test
pipelined value passing within the CPU. That's where the value gets
(re)used before being stored back in the register file. As of this release,
all tests work. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 59 |
Adjusted these library routines to use the new stack frame and calling
conventions. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 58 |
Added a rudimentary profiling support to the simulator. |
dgisselq |
3113d 18h |
/zipcpu/trunk |
| 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 |
3123d 20h |
/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 |
3123d 20h |
/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 |
3123d 20h |
/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 |
3123d 21h |
/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 |
3123d 21h |
/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 |
3123d 21h |
/zipcpu/trunk |
| 51 |
Added the capability to look at binary files and 'see' characters as they
are encoded in memory. |
dgisselq |
3123d 21h |
/zipcpu/trunk |
| 50 |
Dhrystone benchmark updates--added the copyright notice. (Oops!) |
dgisselq |
3133d 12h |
/zipcpu/trunk |
