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[/] [open8_urisc/] [trunk/] [VHDL/] [o8_cpu.vhd] - Rev 227

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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 4783d 14h /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 4874d 07h /open8_urisc/trunk/VHDL/o8_cpu.vhd
156 Optimized for timing,
Flattened block structure to single entity.		 jshamlet 4930d 21h /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 4931d 16h /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 4936d 19h /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 4963d 15h /open8_urisc/trunk/VHDL/o8_cpu.vhd
151 Fixed STO instruction and interrupt logic to avoid address bus corruption issues. jshamlet 4973d 18h /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 5115d 03h /open8_urisc/trunk/VHDL/o8_cpu.vhd
8 Need to learn SVN... jshamlet 5443d 14h /open8_urisc/trunk/VHDL/o8_cpu.vhd
7 Initial Upload jshamlet 5443d 14h /open8_urisc/trunk/open8_urisc/VHDL/o8_cpu.vhd

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