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[/] [open8_urisc/] [trunk/] [VHDL/] [status_led.vhd] - Rev 309

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299 Modified the status_led.vhd to slow down the DIM50PCT signal to 1/32 instead of 1/2 for use with shift-register based discrete LEDs and added the ability to chain the toggle signal to save on resources as well as synchronize the "toggling" jshamlet 845d 13h /open8_urisc/trunk/VHDL/status_led.vhd
256 Removed unused generic from the status_led.vhd and cleaned up comments on the CPU jshamlet 1608d 21h /open8_urisc/trunk/VHDL/status_led.vhd
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 1609d 17h /open8_urisc/trunk/VHDL/status_led.vhd
249 Added a 32-bit wide register and split the status_led core from o8_status_led.vhd, allowing it to be used as a subcomponent elsewhere. jshamlet 1625d 17h /open8_urisc/trunk/VHDL/status_led.vhd

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