Rev |
Log message |
Author |
Age |
Path |
87 |
Adjusted the operator input line to reflect actual logic inputs, rather
than the registered inputs which may have been out of date. (Indeed, they
were out of date for the bug I was chasing and fixed ...) |
dgisselq |
3086d 00h |
/zipcpu |
86 |
Removed the requirement to have the dev.scope.cpu hardware defined outside
of the Zip CPU (it was defined in another project). This was causing a bus
error in the simulator (which it should have), but taking it out fixes things
in the simulator (while removing capability from one special piece of H/W). |
dgisselq |
3086d 00h |
/zipcpu |
85 |
Minor update/correction to operand B definition. |
dgisselq |
3086d 00h |
/zipcpu |
84 |
Minor updates. |
dgisselq |
3086d 00h |
/zipcpu |
83 |
Added a flag to indicate whether an exception took place on the first
or second half of a VLIW instruction--will be zero in non-VLIW mode,
equivalent to the second half of the instruction having caused the
exception. (Expect these flags to be reordered some time in the future into
a less haphazard ordering ...)
Vastly simplified the pipeline logic, primarily for op_stall, but also touched
opA and opB. (Trying to fit within timing on Spartan 6 ...)
Changed division instruction to include a reset on clear_pipeline, to make
certain [BC $addr; DIV Rx,Ry ] works regardless of whether the condition is
true. |
dgisselq |
3086d 00h |
/zipcpu |
82 |
Found and (I hope) fixed a nasty bug that would send the prefetch into an
endless loop whenever you jumped to an instruction at the last location
in an unloaded cache line. |
dgisselq |
3086d 00h |
/zipcpu |
81 |
Trying to clean up ISE generated warnings. |
dgisselq |
3086d 01h |
/zipcpu |
80 |
Bug fix: declared the (combined) multiply to be signed again. Also
changed the name of the generate'd for block, to keep ISE from complaining. |
dgisselq |
3086d 01h |
/zipcpu |
79 |
Adjusted the opcodes for NOOP, BREAK, and LOCK. |
dgisselq |
3090d 04h |
/zipcpu |
78 |
Found/corrected annoying bug in floating point documentation of the opcode
table. |
dgisselq |
3090d 04h |
/zipcpu |
77 |
First check-in: the test bench for the divide instruction. |
dgisselq |
3091d 03h |
/zipcpu |
76 |
The biggest change here was to zippy_tb, to make it more similar to the debugger
and to make it work with VLIW-type instructions. |
dgisselq |
3091d 03h |
/zipcpu |
75 |
Modified for VLIW instructions. |
dgisselq |
3091d 03h |
/zipcpu |
74 |
Added a bunch of debugging code to the Dhrystone benchmark assembly file, as
well as two new testing assembly files. |
dgisselq |
3091d 03h |
/zipcpu |
73 |
Documentations updates. |
dgisselq |
3091d 04h |
/zipcpu |
72 |
Some updated graphics, now containing images of the CPU that include the
divide and (currently non-existant) floating point unit. |
dgisselq |
3091d 04h |
/zipcpu |
71 |
This contains a bunch of bug fixes. (A lot ...) For example, the pipeline
stall code has also seriously changed, to fixed the pipeline memory load/op
stage conflict, while maintaining no-stall operation for operands that don't
need an offset. This had a cascading effect, however, so that the multiply
could no longer complete in a single cycle. Therefore, the timing on the
multiplies was slowed down to two cycles from a single cycle. (It's the
only two-cycle ALU operation ...) The illegal instruction code has also been
fixed, so that illegal instructions no longer stalls the prefetch bus. |
dgisselq |
3091d 04h |
/zipcpu |
70 |
Updated the assembler support files, zopcodes in particular, to handle
the disassembly of the new very long instruction word codes. |
dgisselq |
3091d 04h |
/zipcpu |
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 |
3097d 08h |
/zipcpu |
68 |
Updated specification, includes well illustrated pipeline discussion. |
dgisselq |
3132d 09h |
/zipcpu |