| Rev |
Log message |
Author |
Age |
Path |
| 196 |
Updated internal documentation. |
dgisselq |
2723d 07h |
/zipcpu/trunk/rtl/core/ |
| 194 |
Cleaned up some parameters, trying to create more consistency. |
dgisselq |
2723d 07h |
/zipcpu/trunk/rtl/core/ |
| 193 |
These changes make it so the ALU multiplies pass a test-bench. |
dgisselq |
2723d 07h |
/zipcpu/trunk/rtl/core/ |
| 179 |
Lots of changes, most (all?) of them to the non-pipelined core. The resulting
core is now about 100-120 LUTs smaller when not-pipelined, and yet maintains
the pipelined logic when necessary. |
dgisselq |
2772d 05h |
/zipcpu/trunk/rtl/core/ |
| 178 |
Rewrote the parameter controlled logic to be just that: perameter controller,
rather than depending upon generics. The result reduces our area by a couple
LUTs. |
dgisselq |
2772d 05h |
/zipcpu/trunk/rtl/core/ |
| 177 |
Fixed the illegal address logic to be more precise. |
dgisselq |
2772d 05h |
/zipcpu/trunk/rtl/core/ |
| 176 |
Switched from distributed to block RAM, and adjusted the logic to help
timing closure. The resulting core will build in designs up to 200MHz in
speed. |
dgisselq |
2772d 05h |
/zipcpu/trunk/rtl/core/ |
| 175 |
Fixed the carry bit for logical shifts: it is the last bit shifted out of the
register. 0x80000000>>32 yields a 0 with carry set. Anything logically
shifted by a number greater than thirty two clears carry and register. |
dgisselq |
2772d 05h |
/zipcpu/trunk/rtl/core/ |
| 174 |
Simplified the divide to improve timing performance. |
dgisselq |
2772d 05h |
/zipcpu/trunk/rtl/core/ |
| 160 |
Logic updates, and bug fix corrections to bring this in line with the current
XuLA2-LX25 SoC version. (i.e., the XuLA version was debugged and improved,
this update pushes those improvements to the mainline.) |
dgisselq |
2865d 01h |
/zipcpu/trunk/rtl/core/ |
| 145 |
This fixes the pipelined memory problem that was introduced a while back to
fix ... pipelined memory conflicts. This appears to maintain the success
of the fix, while recovering the pipeline memory performance that was had
before. |
dgisselq |
2897d 23h |
/zipcpu/trunk/rtl/core/ |
| 140 |
Minor changes, but fixes build of zippy_tb.cpp. |
dgisselq |
2901d 13h |
/zipcpu/trunk/rtl/core/ |
| 138 |
This updates the CPU multiply instruction into a set of three instructions.
MPY is a 32x32-bit multiply instruction, returning the low 32-bit result,
MPYUHI returns the upper 32-bits assuming the result was unsigned and MPYSHI
returns the upper 32-bits assuming the result was signed. |
dgisselq |
2904d 10h |
/zipcpu/trunk/rtl/core/ |
| 133 |
Changes preceding an instruction set update, which will change the multiply
operation from a 16x16 bit multiply to three types of 32x32-bit multiplies. |
dgisselq |
2919d 01h |
/zipcpu/trunk/rtl/core/ |
| 132 |
Lots of minor bug fixes. |
dgisselq |
2919d 01h |
/zipcpu/trunk/rtl/core/ |
| 131 |
Fixed a variable use before declaration error. |
dgisselq |
2919d 01h |
/zipcpu/trunk/rtl/core/ |
| 130 |
Simplified the lock logic, and removed it when pipelining was not defined. This
also means the file is now dependent upon cpudefs.v. In another change, brev
was modified so as not to update the flags. This makes it useable with GCC
as a potential move or load immediate instruction. |
dgisselq |
2919d 01h |
/zipcpu/trunk/rtl/core/ |
| 129 |
Bug fix. Fixes some ugly race conditions that would cause code from the wrong
address to be executed. |
dgisselq |
2919d 01h |
/zipcpu/trunk/rtl/core/ |
| 118 |
Fixes two bugs: 1) in the early branching code within the instruction decoder.
This prevented the early branching from working when built with Xilinx's tools,
while the code worked with Verilator. 2) The CPU was not working with the
traditional cache and early branching disabled. These two bugs masked each
other. The replacement code is simpler. |
dgisselq |
2938d 02h |
/zipcpu/trunk/rtl/core/ |
| 105 |
Fixed some nasty early branching bugs. Adjusted the Makefile to declare that
cpudefs.h was automatically generated from cpudefs.v, and made sure that
zipbones included the cpudefs.v so it could get the DEBUG_SCOPE define.
In addition, the test.S was updated to test long jumps, the early branching
bug we found, and all three early branching instructions: ADD #x,PC, LOC(PC),PC,
and LDI #x,PC. |
dgisselq |
2962d 10h |
/zipcpu/trunk/rtl/core/ |
