March 2010: Oregano Systems - Design & Consulting GesmbH
============================================================
Changes:
- In certain interrupt situations the stack pointer still
has been erroneously set in control_mem_rtl.vhd, revision
1.10 and below. This has been corrected again in revision
1.11 of this file.
- The Serial Unit did not handle receives with only one
stop bit correctly in Mode1 in file mc8051_siu_rtl.vhd,
revision 1.9 and below. This has been corrected with
revision 1.10 of this file.
- The CJNE opcode did not clear the carry flag when it
should in file control_fsm_rtl.vhd, revision 1.9 and
below. This has been corrected with revision 1.10 of this
file.
************************************************************
This is version 1.5 of the MC8051 IP core.
September 2006: Oregano Systems - Design & Consulting GesmbH
============================================================
Changes:
- When an interrupt is pending and the instruction executed
is RETI or a write access to IE or IP one more instruction
is executed before vectoring to the interrupt routine.
- The synchronization stage of the interrupt inputs in the
timer/counter unit has been hardended with additional
series flip-flops due to the high operating frequencies
nowadays in use.
- A prescaler in the serial interface unit has been changed
to 1/12 instead of 1/16 to conform to mode 0 databook
descriptions.
- The carry flag was incorrectly reset during a special
situation. This has been corrected.
- tmr/ctr1 erroneously used his run flag when tmr/ctr0 was
in mode 3. This has been corrected.
- In certain interrupt situations the stack pointer has
been erroneously set. This has been corrected.
============================================================
Oregano Systems - Design & Consulting GesmbH
Phorusgasse 8, A-1040 Vienna
************************************************************
This is version 1.4 of the MC8051 IP core.
November 2004: Oregano Systems - Design & Consulting GesmbH
============================================================
Changes:
- corrected behaviour of RETI instruction handling
- added synchronization for interrupt signals
- corrected timer problems
************************************************************
This is version 1.3 of the MC8051 IP core.
September 2002: Oregano Systems - Design & Consulting GesmbH
============================================================
Change history:
- Improved tb_mc8051_siu_sim.vhd to verify duplex operation.
- Corrected problem with duplex operation in file
mc8051_siu_rtl.vhd
************************************************************
This is version 1.2. of the MC8051 IP core.
June 2002 - Oregano Systems - Design & Consulting GesmbH
============================================================
Change history:
- Eliminated the scr subdirectory form the distribution.
- Improved documentation.
- Corrected several bugs in the source code (see the
website for more details).
- Improved the testbench with respect to the I/O port
behavior.
- Enriched the msim directory with the assembler source
code of an example program.
- Provided the source code of a Intel hex to binary
textfile converter to ease simulation of the user's
assambler programs.
************************************************************
This is version 1.1. of the MC8051 IP core.
Jan 31st 2002 - Oregano Systems - Design & Consulting GesmbH
mc8051_design_v1.6.zip
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