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[/] [open8_urisc/] [trunk/] [VHDL/] [o8_cpu.vhd] - Rev 231

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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 4584d 08h /open8_urisc/trunk/VHDL/o8_cpu.vhd
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 4675d 01h /open8_urisc/trunk/VHDL/o8_cpu.vhd
156 Optimized for timing,
Flattened block structure to single entity.		 jshamlet 4731d 16h /open8_urisc/trunk/VHDL/o8_cpu.vhd
155 Fixed additional interrupt logic bug,
Optimized several blocks - including ALU, stack, program counter, and data path.		 jshamlet 4732d 11h /open8_urisc/trunk/VHDL/o8_cpu.vhd
154 Fixed problem with missing data path override in interrupt logic. Should resolve issues with processor crashing when an interrupt occurs as a STO instruction is being executed. jshamlet 4737d 13h /open8_urisc/trunk/VHDL/o8_cpu.vhd
153 Fixed bug in interrupt logic that caused stack pointer to increment if interrupt occurred as specific instructions were being decoded,
Fixed bug in interrupt logic where instruction caching would remain enabled during an interrupt, causing improper execution depending on what instruction was in the decode stage as the interrupt is trigered.		 jshamlet 4764d 09h /open8_urisc/trunk/VHDL/o8_cpu.vhd
151 Fixed STO instruction and interrupt logic to avoid address bus corruption issues. jshamlet 4774d 12h /open8_urisc/trunk/VHDL/o8_cpu.vhd
10 corrected implementation for BTT to match V8/ARClite definition, changed sense of reset, corrected comments to match source values khays 4915d 21h /open8_urisc/trunk/VHDL/o8_cpu.vhd
8 Need to learn SVN... jshamlet 5244d 08h /open8_urisc/trunk/VHDL/o8_cpu.vhd
7 Initial Upload jshamlet 5244d 08h /open8_urisc/trunk/open8_urisc/VHDL/o8_cpu.vhd

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