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1993-11-09
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Release Notes for SIMIC Version 1
---------------------------------
Release History:
Version 1.01.00
-------------------------------------------------------------------------------
(1) JK timing checks could not be disabled properly. This has been
corrected.
(2) The SIMIC circuit compiler did not accept by pin-name connections
in the form: "<signal_list(pin_list)>", only "<signal(pin)>", or
"signal(pin)". This has been corrected.
(3) Corrected problem with the compilation of the RAM primitives.
(4) Reduced storage requirements for small RAMs (< 1024 words).
(5) Fixed problem with BTGBUS elements with drivers that can vary
delays. This could result in the program crashing.
(6) Added Fault sensitization analysis. See SENSITIZE command in
manual for full documentation.
(7) Added Fault grading analysis. See FAULT command in manual for
full documentation.
Version 1.00.04
--------------------------------------------------------------------------------
(1) Added NQ output option for the D-latch and all flip-flop primitives.
This output is is treated independent of Q in terms of hazard analysis
and delay parameters.
(2) Allow a macro to be specified without any internal parts, if the macro
has only input pins. This allows non-simulation entities (such as bus
terminators) to be included in the description without adding any
elements to the circuit.
(3) Fixed simulation topology error when primitive inputs were connected
to UNUSED.
(4) Fixed Boolean equation parser to match literals exactly, rather than
accepting prefix.
(5) Boolean state variables remained at an X value. States are now
properly updated.
(6) Warning message was not issued if applied pattern's width was not the
same as the list of signals designated. The message comes out now.
(7) Writing to ram would set to zero 4 bits in the following address, if
the number of data lines was a multiple of 4. This has been corrected.
(8) Patterns specified with format option characters (%#*^) following
a duration (&) or absolute position (@) specification, did not
process the & or @ specification correctly. These specifications are
now properly processed.
(9) WARN FILE, BREAK FILE, TRACE FILE, or WRITE FILE commands specifying
previously specified file caused 'File allocation error' message.
This has been fixed.
(10) Added FILE option to query (?) commands. This allows queried
information to be directed into files. The default extension for this
file is ".qry". This option is NOT sticky and only applies to the
current query command. If the same file name is used in subsequent
query commands in the same SIMIC session, then the information will be
appended to the file. For Example:
?LOADING LIST: FILE:
sends the loading information to a file with the default file's name
with the extension ".qry,
?DELAY LIST: FILE=delays
sends the delay information to the file, delays.qry.
Version 1.00.03
--------------------------------------------------------------------------------
(1) It has been found that no matter what names the primitive type are
given, they may conflict with a cell library naming convention.
The established type precedence forced the netlister (manual or
automatic) to resolve naming conflicts itself, with the
"composition" keyword. The task of resolving type name conflicts has
been moved to the cell library developers. This was accomplished by
reversing the search order for instantiation of types. The new order
is:
(a) Macros,
(b) Booleans, then
(c) Primitives.
This new order should only impact designs with conflicting type names.
A warning is issued if multiple representations of a type is being
defined.
Note: If you are using case sensitivity mode (-s command line option),
Then the primitive will be selected if the case of the
instantiating type does not perfectly match the Macro (or
Boolean) definition.
(2) If a TSTEP operation is in effect (such as a WRITE TSTEP option), and
a SIMULATE PRANGE command is given, then the TSTEP operation continued
after the circuit became stable following the last applied pattern,
and end only when the remaining (suppressed) patterns have been
completed. This has been fixed to end all TSTEP operations at the
first stable point.
(3) There was an extra "End of file." message at the end of an EXECUTE
FILE operation. This has been suppressed.
(4) If an annotation file placed loading on a non-existent node, then
a fatal error was generated. This error has been reduced to a warning.
(5) The tstep operations, if changed while the circuit was frozen, did
not work correctly when simulation was continued. The tstep now
occurs at the expected point.
(6) Simic did not allow the LIST= option with the NO HISTORY command.
This has been corrected.
(7) Selecting delay tables, and annotation of individual tables did not
work properly under some unusual paths. This has been corrected.
(8) Initializing Rom and Ram elements with the CLAMP DATA command did
not work properly. This operation now works as expected.
(9) Run commands that used elements of an array, either reported the
signal as not found or crashed. This has been corrected.
Version 1.00.02
--------------------------------------------------------------------------------
(1) The GET REPORT=ALL command operation would crash simic if more than
2048 pins were connected to a single node. In addition, this
operation would show all delays and decays as 0, rather than the
correct TYPICAL values. Both these problems have been fixed.
(2) The Flip-flop primitives did not have a standard convention for
distinguishing positive and negative edge variants. This version
uses the following convention: The letter N prefixes the letter C
(or L in the case of the D-latch) to indicate a negative (or low)
active clock. Otherwise the letter P (for positive) replaces the
letter N. All previous aliases are supported. The following is a
list of elements (aliases are in parenthesis):
Positive Clock: Negative Clock: Description:
DPL (DL) DNL D latch
DPCF (DCF) DNCF D flip-flop
JKPCF JKNCF (JKCF) JK flip-flop
TPCF TNCF (TCF) T flip-flop
Version 1.00.01
--------------------------------------------------------------------------------
(1) There were a number of problems discovered in the case sensitive mode
(-s command line option). The worst was the incorrect mapping of the
lowercase values describing pattern definitions. All known case
sensitivity problems have been corrected.
================================================================================
The following features are present in Version 1.00, but not yet documented in
the SIMIC User's Guide, Release 1.
(1) Electrical rules checking in circuit compiler.
(a) undriven nodes [Fatal]
(b) dangling nodes
(c) drivers without any fanouts
(d) non-tristating elements wire-tied.
(2) NQ outputs are optionally available for each of the flip-flop and
D-latch primitives. NQ values are computed by complementing the Q
equation. Delays and X-propagation are computed separately for Q and
NQ.