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[/] [open8_urisc/] [trunk/] [VHDL/] - Rev 282

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260 Added missing comments for Sequential_Interrupts generic, as well as comments explaining portions of the CPU operations. jshamlet 1490d 15h /open8_urisc/trunk/VHDL
259 Fixed issue where Write_Fault wasn't defaulting to '0' when Write_Protect was set to FALSE,
Added a pulse interval measurement entity,
Fixed comments.		 jshamlet 1490d 17h /open8_urisc/trunk/VHDL
258 Fixed write bug in o8_ltc2355_2p.vhd, added a newer Open8_cfg.vhd, and the sys_tick.vhd utility entity. jshamlet 1491d 14h /open8_urisc/trunk/VHDL
257 Fixed misnamed signal in o8_7seg.vhd and added a replacement switch interface that handles both static and pushbutton switches. jshamlet 1491d 15h /open8_urisc/trunk/VHDL
256 Removed unused generic from the status_led.vhd and cleaned up comments on the CPU jshamlet 1491d 16h /open8_urisc/trunk/VHDL
255 Modified code to make ModelSim happy (It didn't like the generate blocks for some reason). Also added a block describing the new generic. jshamlet 1491d 20h /open8_urisc/trunk/VHDL
254 Simplified the ISR address logic so that the upper 12 bits are constant (set by generic) and only the lower 4 bits are registered/computed. jshamlet 1492d 11h /open8_urisc/trunk/VHDL
253 Fixed spelling error in comment jshamlet 1492d 11h /open8_urisc/trunk/VHDL
252 (This time the CPU model was included...)
Added the ability to use unsigned offsets to the LDO/STO instructions. The original behavior of signed offsets is preserved if the Unsigned_Index_Offsets is left unset or set to FALSE. While inserting this code, pipeline registers were also inserted into the address generation logic for indexed instructions. This simplifies the final multiplexor and improves FMax at the slight expense of LDO/SDO now taking one additional clock cycle to execute.		 jshamlet 1492d 12h /open8_urisc/trunk/VHDL
251 Added RAM write fault detection, which can be used to indicate a memory write violation by the CPU. This allows a clean shutdown in the event of a memory problem/program crash.

Fixed a bug in the status_led.vhd entity that kept the flashing light function from working. The new code uses a maximal length 24-bit LFSR to create long delays. This is more efficient than a binary counter, but results in non-exact frequencies as a function of SYSTEM_FREQUENCY / (2^24-1).

Added the ability to use unsigned offsets to the LDO/STO instructions. The original behavior of signed offsets is preserved if the Unsigned_Index_Offsets is left unset or set to FALSE. While inserting this code, pipeline registers were also inserted into the address generation logic for indexed instructions. This simplifies the final multiplexor and improves FMax at the slight expense of LDO/SDO now taking one additional clock cycle to execute.		 jshamlet 1492d 12h /open8_urisc/trunk/VHDL

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