OpenCores
URL https://opencores.org/ocsvn/zipcpu/zipcpu/trunk

Subversion Repositories zipcpu

[/] [zipcpu/] [trunk/] [rtl/] - Rev 181

Rev

Go to most recent revision

Filtering Options

Clear current filter

Rev Log message Author Age Path
181 Adjusted the wishbone logic to include our wishbone simplification that if
CYC is ever low, STB must be low as well.
dgisselq 2716d 09h /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 2716d 09h /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 2716d 09h /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 2716d 09h /zipcpu/trunk/rtl/
177 Fixed the illegal address logic to be more precise. dgisselq 2716d 09h /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 2716d 09h /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 2716d 09h /zipcpu/trunk/rtl/
174 Simplified the divide to improve timing performance. dgisselq 2716d 09h /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 2809d 05h /zipcpu/trunk/rtl/
157 Added the divide unit to the list of ZipCPU dependencies. dgisselq 2809d 05h /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 2842d 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 2842d 04h /zipcpu/trunk/rtl/
140 Minor changes, but fixes build of zippy_tb.cpp. dgisselq 2845d 17h /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 2848d 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 2863d 05h /zipcpu/trunk/rtl/
132 Lots of minor bug fixes. dgisselq 2863d 05h /zipcpu/trunk/rtl/
131 Fixed a variable use before declaration error. dgisselq 2863d 05h /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 2863d 05h /zipcpu/trunk/rtl/
129 Bug fix. Fixes some ugly race conditions that would cause code from the wrong
address to be executed.
dgisselq 2863d 05h /zipcpu/trunk/rtl/
128 Cleaned up some comments. dgisselq 2863d 05h /zipcpu/trunk/rtl/

1 2 Next >

Show All

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.