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[/] [open8_urisc/] - Rev 221

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Rev Log message Author Age Path
221 o8_vdsm8.vhd now has a default value assigned at compile time, o8_register.vhd was cleaned up some more. jshamlet 1515d 22h /open8_urisc/
220 More revision sections added jshamlet 1515d 22h /open8_urisc/
219 Added revision block and corrected creation date. jshamlet 1515d 22h /open8_urisc/
218 Revision sections added,
vdsm8.vhd added.		 jshamlet 1515d 22h /open8_urisc/
217 Broke out the vdsm8 as a separate entity, since it is used in several places,
Even MORE code cleanup.		 jshamlet 1515d 22h /open8_urisc/
216 Fixed missing parenthesis jshamlet 1516d 00h /open8_urisc/
215 More code cleanup jshamlet 1516d 01h /open8_urisc/
214 Initial add of some older code jshamlet 1519d 23h /open8_urisc/
213 Code and comment cleanup jshamlet 1519d 23h /open8_urisc/
212 Fixed issue with rewritten epoch timer not clearing alarm on set point write. jshamlet 1520d 05h /open8_urisc/
211 Ok, this time with feeling. Timer should now properly reset on interval update. jshamlet 1521d 03h /open8_urisc/
210 Modified the timers to reset on new interval write. This avoids an issue in the original design where the timer had to reach zero before updating, potentially causing unwanted interrupts.
Also added a flag to the CPU to allow interrupts to be processed sequentially based on the state of the I bit. This one is set to false by default, as it is a significant change in interrupt behavior. Long, and reentrant, ISRs can clear the I bit prematurely to allow themselves to be interrupted.
Lastly, added the I bit to the exported flags for possible use in memory protection schemes.		 jshamlet 1521d 05h /open8_urisc/
209 Fixed an issue in the PIT timer that caused an immediate interrupt on interval write,
Fixed an issue in the epoch timer that resulted in a spurious interrupt due to extra LSB's being set by default in the set point register,
While cleaning elsewhere, founding a spacing issue in the CPU HDL,
Added a 4k ROM and MW core.		 jshamlet 1521d 18h /open8_urisc/
208 Removed unnecessary package references jshamlet 1522d 03h /open8_urisc/
207 Added a simple 8-bit, fixed asynchronous serial interface with compile time settable bit-rate, parity enable, and parity mode generics. jshamlet 1522d 20h /open8_urisc/
206 Merged interrupt logic with other clocked process. jshamlet 1526d 15h /open8_urisc/
205 More code and comment cleanup for the new SDLC engine jshamlet 1526d 15h /open8_urisc/
204 Fixed more incorrect comments jshamlet 1526d 16h /open8_urisc/
203 Removed an extra delay FF from the bitclock rising edge signal for the clock slave configuration to better center the rising edge pulse on the receive signal. jshamlet 1526d 22h /open8_urisc/
202 Fixed receiver bug that caused false flag detection,
Split the large sdlc_serial_ctrl entity into sub-entities to make debugging easier.		 jshamlet 1526d 23h /open8_urisc/

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