Rev |
Log message |
Author |
Age |
Path |
184 |
Adjusted the illegal instruction option documentation. |
dgisselq |
2840d 15h |
/zipcpu/trunk/rtl |
183 |
Cleaned up the system so that !CYC implies !STB as well. |
dgisselq |
2840d 15h |
/zipcpu/trunk/rtl |
182 |
Bug fix for fast memories. This now works for memories with single cycle
latencies. |
dgisselq |
2840d 15h |
/zipcpu/trunk/rtl |
181 |
Adjusted the wishbone logic to include our wishbone simplification that if
CYC is ever low, STB must be low as well. |
dgisselq |
2840d 15h |
/zipcpu/trunk/rtl |
180 |
Cleaned up the stall logic--made it independent of whether or not we are
designed to be alternating or not. |
dgisselq |
2840d 15h |
/zipcpu/trunk/rtl |
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 |
2840d 15h |
/zipcpu/trunk/rtl |
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 |
2840d 15h |
/zipcpu/trunk/rtl |
177 |
Fixed the illegal address logic to be more precise. |
dgisselq |
2840d 15h |
/zipcpu/trunk/rtl |
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 |
2840d 15h |
/zipcpu/trunk/rtl |
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 |
2840d 15h |
/zipcpu/trunk/rtl |
174 |
Simplified the divide to improve timing performance. |
dgisselq |
2840d 15h |
/zipcpu/trunk/rtl |
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 |
2933d 11h |
/zipcpu/trunk/rtl |
157 |
Added the divide unit to the list of ZipCPU dependencies. |
dgisselq |
2933d 11h |
/zipcpu/trunk/rtl |
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 |
2966d 10h |
/zipcpu/trunk/rtl |
144 |
Makes the auto-reload capability a configuration option, and fills out the
reset so that it is properly implemented. |
dgisselq |
2966d 10h |
/zipcpu/trunk/rtl |
140 |
Minor changes, but fixes build of zippy_tb.cpp. |
dgisselq |
2969d 23h |
/zipcpu/trunk/rtl |
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 |
2972d 21h |
/zipcpu/trunk/rtl |
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 |
2987d 11h |
/zipcpu/trunk/rtl |
132 |
Lots of minor bug fixes. |
dgisselq |
2987d 11h |
/zipcpu/trunk/rtl |
131 |
Fixed a variable use before declaration error. |
dgisselq |
2987d 11h |
/zipcpu/trunk/rtl |
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 |
2987d 11h |
/zipcpu/trunk/rtl |
129 |
Bug fix. Fixes some ugly race conditions that would cause code from the wrong
address to be executed. |
dgisselq |
2987d 11h |
/zipcpu/trunk/rtl |
128 |
Cleaned up some comments. |
dgisselq |
2987d 11h |
/zipcpu/trunk/rtl |
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 |
3006d 12h |
/zipcpu/trunk/rtl |
115 |
A bug fix, applies to when there are more than 9 interrupt lines into the CPU. |
dgisselq |
3006d 20h |
/zipcpu/trunk/rtl |
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 |
3030d 20h |
/zipcpu/trunk/rtl |
91 |
Minor updates. |
dgisselq |
3071d 13h |
/zipcpu/trunk/rtl |
90 |
Removed MOV x(PC),PC from the list of possible early branching instructions.
ADD X,PC and LDI X,PC are now the only recognized early branching instructions.
This was done to spare logic, although I don't think I spared more than a
LUT or two. |
dgisselq |
3071d 13h |
/zipcpu/trunk/rtl |
88 |
Eliminated some warnings. The div fixes were to simplify the logic, even though
the result is less readable ... |
dgisselq |
3095d 13h |
/zipcpu/trunk/rtl |
84 |
Minor updates. |
dgisselq |
3097d 12h |
/zipcpu/trunk/rtl |