Rev |
Log message |
Author |
Age |
Path |
201 |
RTL files for the 8-bit capable ZipCPU. |
dgisselq |
2635d 12h |
/zipcpu/trunk/rtl |
196 |
Updated internal documentation. |
dgisselq |
2761d 12h |
/zipcpu/trunk/rtl |
195 |
Adds a new mode that can handle a delayed stall signal. |
dgisselq |
2761d 12h |
/zipcpu/trunk/rtl |
194 |
Cleaned up some parameters, trying to create more consistency. |
dgisselq |
2761d 12h |
/zipcpu/trunk/rtl |
193 |
These changes make it so the ALU multiplies pass a test-bench. |
dgisselq |
2761d 12h |
/zipcpu/trunk/rtl |
184 |
Adjusted the illegal instruction option documentation. |
dgisselq |
2810d 10h |
/zipcpu/trunk/rtl |
183 |
Cleaned up the system so that !CYC implies !STB as well. |
dgisselq |
2810d 10h |
/zipcpu/trunk/rtl |
182 |
Bug fix for fast memories. This now works for memories with single cycle
latencies. |
dgisselq |
2810d 10h |
/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 |
2810d 10h |
/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 |
2810d 10h |
/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 |
2810d 10h |
/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 |
2810d 10h |
/zipcpu/trunk/rtl |
177 |
Fixed the illegal address logic to be more precise. |
dgisselq |
2810d 10h |
/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 |
2810d 10h |
/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 |
2810d 10h |
/zipcpu/trunk/rtl |
174 |
Simplified the divide to improve timing performance. |
dgisselq |
2810d 10h |
/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 |
2903d 06h |
/zipcpu/trunk/rtl |
157 |
Added the divide unit to the list of ZipCPU dependencies. |
dgisselq |
2903d 06h |
/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 |
2936d 04h |
/zipcpu/trunk/rtl |
144 |
Makes the auto-reload capability a configuration option, and fills out the
reset so that it is properly implemented. |
dgisselq |
2936d 05h |
/zipcpu/trunk/rtl |
140 |
Minor changes, but fixes build of zippy_tb.cpp. |
dgisselq |
2939d 18h |
/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 |
2942d 15h |
/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 |
2957d 06h |
/zipcpu/trunk/rtl |
132 |
Lots of minor bug fixes. |
dgisselq |
2957d 06h |
/zipcpu/trunk/rtl |
131 |
Fixed a variable use before declaration error. |
dgisselq |
2957d 06h |
/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 |
2957d 06h |
/zipcpu/trunk/rtl |
129 |
Bug fix. Fixes some ugly race conditions that would cause code from the wrong
address to be executed. |
dgisselq |
2957d 06h |
/zipcpu/trunk/rtl |
128 |
Cleaned up some comments. |
dgisselq |
2957d 06h |
/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 |
2976d 07h |
/zipcpu/trunk/rtl |
115 |
A bug fix, applies to when there are more than 9 interrupt lines into the CPU. |
dgisselq |
2976d 14h |
/zipcpu/trunk/rtl |