| Rev |
Log message |
Author |
Age |
Path |
| 185 |
1) Fixed an apparently long-standing bug where the interrupt bit wasn't being cleared after an RTI
2) Modified the program counter logic to be simpler. It now always increments, and states control the increment using the offset field. A new set of constants was added to replace the old states.
3) Modified the ALU to always use Operand1 instead of ALU_Ctrl.Data (and removed the field in the record). A new ALU command, ALU_GMSK, was added, as it was the only instruction to set the .Data field to something other than Operand1 (Int_Mask)
4) Modified the package file so that flag names match what the assembler calls them. FL_Z is now PSR_Z, FL_GP1 is now PSR_GP4, etc.
5) Cleaned up the comments and code formatting |
jshamlet |
1608d 20h |
/open8_urisc/trunk/ |
| 184 |
More file/entity renaming to match private versions. |
jshamlet |
1610d 20h |
/open8_urisc/trunk/ |
| 183 |
Renamed core to o8_cpu to match new naming scheme |
jshamlet |
1610d 20h |
/open8_urisc/trunk/ |
| 182 |
Simplified the address generation logic at the expense of making LDX take one additional clock cycle. This allowed the address logic to be split out of the main state machine and simplified (greatly). During this process, a bug in SDO was found and fixed that caused it to return through the wrong pipe fill state wnen auto increment was disabled. |
jshamlet |
1610d 20h |
/open8_urisc/trunk/ |
| 181 |
Altered the RSP instruction to allow the stack pointed to either be restored from registers or stored to registers based on the status of a processor bit. Also modified LDX to simplify the address logic. |
jshamlet |
1611d 17h |
/open8_urisc/trunk/ |
| 180 |
Added additional Open8 compatible modules |
jshamlet |
1615d 21h |
/open8_urisc/trunk/ |
| 179 |
Replacing files accidentally deleted during check-in |
jshamlet |
1625d 16h |
/open8_urisc/trunk/ |
| 178 |
Adding Open8 toolset for pure assembly |
jshamlet |
1625d 17h |
/open8_urisc/trunk/ |
| 177 |
Fixed comments in RTC module |
jshamlet |
2935d 21h |
/open8_urisc/trunk/ |
| 176 |
Fixed documentation errors,
Modified uSec_Tick such that it is always generated regardless of the interval. |
jshamlet |
2940d 19h |
/open8_urisc/trunk/ |
| 175 |
Added 4 and 8-bit LCD interfaces with backlight and contrast DACs |
jshamlet |
2940d 23h |
/open8_urisc/trunk/ |
| 174 |
Added ROM/RAM wrappers |
jshamlet |
3135d 18h |
/open8_urisc/trunk/ |
| 173 |
Added a couple of useful interfaces for detecting button presses and clock changes. |
jshamlet |
3135d 18h |
/open8_urisc/trunk/ |
| 172 |
General code cleanup |
jshamlet |
3135d 18h |
/open8_urisc/trunk/ |
| 171 |
Fixed comments for offsets 0x0 - 0x3 to indicate the read value |
jshamlet |
3135d 18h |
/open8_urisc/trunk/ |
| 170 |
Added 24-bit resolution epoch timer / alarm clock |
jshamlet |
3135d 19h |
/open8_urisc/trunk/ |
| 169 |
Corrected issue with CMP and SBC generating an inverted carry flag and added new constants to the package file to simplify interfacing new modules. |
jshamlet |
3190d 19h |
/open8_urisc/trunk/ |
| 168 |
Simplified write data path logic,
Converted RTC to packed BCD,
Corrected several bugs in real time clock component, |
jshamlet |
3969d 15h |
/open8_urisc/trunk/ |
| 167 |
Updated CPU model; Pipelined ALU control signals to improve fMAX, corrected issue with interrupt controller priority not being obeyed, fixed bug in auto-indexing instructions where the upper register wasn't being properly incremented, cleaned up code to make the processor model easier to follow.
Added several useful modules that use the Open8 bus. |
jshamlet |
3977d 14h |
/open8_urisc/trunk/ |
| 166 |
fixed additional issues with range checking on PCREL relocations for open8, added test cases to verify, catch tree up with binutils datestamp 20120301 |
khays |
4541d 15h |
/open8_urisc/trunk/ |
| 165 |
fixed issues with PC relative fixups in the linker |
khays |
4542d 22h |
/open8_urisc/trunk/ |
| 164 |
Modified the data path to allow the bus to go idle while waiting for an interrupt. This makes it easier to debug code that uses the WAI instruction, as both Wr_Enable and Rd_Enable go low. |
jshamlet |
4613d 09h |
/open8_urisc/trunk/ |
| 163 |
sync with binutils 2.22.51.20111114 |
khays |
4650d 21h |
/open8_urisc/trunk/ |
| 162 |
Added optional generic to specify that the BRK instruction implements a WAit_for_Interrupt (WAI) instruction instead. Logically emulates INT, but without triggering a soft interrupt. Note that the NOP instruction maps to BRK, and will not function correctly if this option is set. |
jshamlet |
4704d 02h |
/open8_urisc/trunk/ |
| 161 |
synchronize binutils/ with gnu dev tree of 2.21.53.20110828 |
khays |
4727d 21h |
/open8_urisc/trunk/ |
| 160 |
synchronize binutils/gas with gnu dev tree of 2.21.53.20110828 |
khays |
4727d 21h |
/open8_urisc/trunk/ |
| 159 |
synchronize binutils/gold with gnu dev tree of 2.21.53.20110828 |
khays |
4727d 21h |
/open8_urisc/trunk/ |
| 158 |
synchronize binutils/opcodes with gnu dev tree of 2.21.53.20110828 |
khays |
4727d 21h |
/open8_urisc/trunk/ |
| 157 |
synchronize binutils/ld with gnu dev tree of 2.21.53.20110828 |
khays |
4727d 21h |
/open8_urisc/trunk/ |
| 156 |
Optimized for timing,
Flattened block structure to single entity. |
jshamlet |
4760d 17h |
/open8_urisc/trunk/ |
