Changelong
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Changelong
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----------
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16.07.14
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- decoders.v : decode of some opcodes modified to improve size & speed
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- MC6809_cpu.v : Removed dec_o_optype and added single wire signals for common opcodes
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06.07.14
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06.07.14
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- decoders.v : fixed missing left/dest paths for sex
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- decoders.v : fixed missing left/dest paths for sex
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- alu16.v : fixed sex, mul, c flag for shifts, ror
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- alu16.v : fixed sex, mul, c flag for shifts, ror
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- MC6809_cpu.v : fixed indirect indexed
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- MC6809_cpu.v : fixed indirect indexed
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05.07.14
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05.07.14
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- decoders.v : fixed missing left/dest paths for daa
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- decoders.v : fixed missing left/dest paths for daa
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- alu16.v : fixed daa, h flag store and generation
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- alu16.v : fixed daa, h flag store and generation
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04.07.14
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04.07.14
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- decoders.v : fixed page 2&3 operands, jmp, cmp
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- decoders.v : fixed page 2&3 operands, jmp, cmp
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- MC6809_cpu.v : fixed jmp
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- MC6809_cpu.v : fixed jmp
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02.07.14
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02.07.14
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- decoders.v : fixed dec, fixed inc (didn't read before write), fixed clr for ea direct, extended, indexed
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- decoders.v : fixed dec, fixed inc (didn't read before write), fixed clr for ea direct, extended, indexed
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added a path with the decoded sources/destination for the decode stage
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added a path with the decoded sources/destination for the decode stage
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- MC6809_cpu.v : implemented two paths for source/dest from the decoder
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- MC6809_cpu.v : implemented two paths for source/dest from the decoder
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- rumsim.bat : added batch file for simulation
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- rumsim.bat : added batch file for simulation
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22.06.14
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22.06.14
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- decoders.v : fixed wrong left/right/dest paths for several extended, page 2, 3 opcodes.
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- decoders.v : fixed wrong left/right/dest paths for several extended, page 2, 3 opcodes.
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- MC6809_cpu.v : fixed jsr extended, indexed
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- MC6809_cpu.v : fixed jsr extended, indexed
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06.02.14
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06.02.14
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- regblock.v : dropped double write of PC
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- regblock.v : dropped double write of PC
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- MC6809_cpu.v : fixed loading of new PC from reset vector, rel8 displacement calculation.
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- MC6809_cpu.v : fixed loading of new PC from reset vector, rel8 displacement calculation.
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06.01.14
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06.01.14
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- decoders.v : added registered outputs for the source/destination address registers
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- decoders.v : added registered outputs for the source/destination address registers
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05.01.14
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05.01.14
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- MC6809_cpu.v : fixed exg (wrong source), implemented SYNC
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- MC6809_cpu.v : fixed exg (wrong source), implemented SYNC
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- decoders.v : fixed destination for BIT
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- decoders.v : fixed destination for BIT
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- defs.v : reduced the number of ALU opcodes
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- defs.v : reduced the number of ALU opcodes
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- alu16.v : reduced the number of ALU opcodes, fused BIT with AND, CMP with SUB
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- alu16.v : reduced the number of ALU opcodes, fused BIT with AND, CMP with SUB
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01.01.14
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01.01.14
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- alu16.v : the alu has been bronken in two units
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- alu16.v : the alu has been bronken in two units
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- MC6809_cpu.v : added CWAI states and decoding
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- MC6809_cpu.v : added CWAI states and decoding
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- decodres.v : added CWAI decoding
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- decodres.v : added CWAI decoding
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31.12.13
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31.12.13
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- Implemented TFR/EXG
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- Implemented TFR/EXG
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- MC6809_cpu.v: Added one more state to execute TFR or EXG
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- MC6809_cpu.v: Added one more state to execute TFR or EXG
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- decoders.v: added source/dest for TFR and EXG
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- decoders.v: added source/dest for TFR and EXG
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- regblock.v : added second write path to the registers for TFR&EXG
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- regblock.v : added second write path to the registers for TFR&EXG
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- defs.v defined new SEQ_TFREXG for tfr&exg execution
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- defs.v defined new SEQ_TFREXG for tfr&exg execution
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30.12.13
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30.12.13
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- Fixed increment/decrement of the stack pointer
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- Fixed increment/decrement of the stack pointer
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- MC6809_cpu.v: Push/pull increment/decrement the stack pointr in their own states
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- MC6809_cpu.v: Push/pull increment/decrement the stack pointr in their own states
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Added eamem source to the left alu data path to check for zero in the ea (leax/leay)
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Added eamem source to the left alu data path to check for zero in the ea (leax/leay)
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29.12.13
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29.12.13
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- Fixed wrong byte in SEQ_MEM_WRITE_H
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- Fixed wrong byte in SEQ_MEM_WRITE_H
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- Fixed unaffected Z flag for LEAX/LEAY
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- Fixed unaffected Z flag for LEAX/LEAY
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- Moved increment of pc from FETCH_2 to FETCH_1
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- Moved increment of pc from FETCH_2 to FETCH_1
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- Fixed CMPA/CMPB/CMPX, they don't write a register back
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- Fixed CMPA/CMPB/CMPX, they don't write a register back
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- Fixed late write of pc
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- Fixed late write of pc
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- decoders.v: Merged separated write_dest_x into one wire
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- decoders.v: Merged separated write_dest_x into one wire
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Added a source_size wire to indicate the width of the source argument
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Added a source_size wire to indicate the width of the source argument
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Added the recognition of LEA as an alu mnemonic to modify the Z flag for LEAX/LEAY
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Added the recognition of LEA as an alu mnemonic to modify the Z flag for LEAX/LEAY
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- MC6809_cpu.v: Dropped checks for source size from the individual states and moved
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- MC6809_cpu.v: Dropped checks for source size from the individual states and moved
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into SEQ_MEM_READ_H
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into SEQ_MEM_READ_H
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Merged write flags into k_dest_write
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Merged write flags into k_dest_write
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- alu.v: Added a LEA instruction for LEAX/LEAY where only the Z flag will be affected
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- alu.v: Added a LEA instruction for LEAX/LEAY where only the Z flag will be affected
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- defs.v : added a LEA define to the ALU section
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- defs.v : added a LEA define to the ALU section
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