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Extended the fanout record to 16 links

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Added SHFT and OFFS fields for backwards compatibility.
See Release Notes for detailed description.
This commit is contained in:
Andrew Johnson
2012-09-14 10:56:08 -05:00
parent c48e92b1a8
commit a106129c9b
3 changed files with 177 additions and 63 deletions
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documentation/RELEASE_NOTES.html
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@@ -15,6 +15,47 @@ EPICS Base 3.15.0.x releases are not intended for use in production systems.</p>
<h2 align="center">Changes between 3.15.0.1 and 3.15.0.2</h2>
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<h3>Fanout record enhancements</h3>
<p>The fanout record type now has 16 output links LNK0-LNK9 and LNKA-LNKF, plus
two additional fields which make the result backwards compatible with 3.14
databases, but also allow the link selection to be shifted without having to
process the SELN value through a calc or calcout record first.</p>
<p>Previously there was no LNK0 field, so when SELM is <q>Mask</q> bit 0 of SELN
controls whether the LNK1 link field was activated; bit 1 controls LNK2 and so
on. When SELM is <q>Specified</q> and SELN is zero no output link would be
activated at all; LNK1 gets activated when SELN is 1 and so on. Only 6 links
were provided, LNK1 through LNK6. The updated record type maintains the original
behavior when the new fields are not configured.</p>
<p>The update involved adding a LNK0 field, as well as fields LNK7 through LNK9
and LNKA through LNKF. To add flexibility and maintain backwards compatibility,
two additional fields have been added:</p>
<dl>
<dt><b>OFFS</b></dt>
<dd>This field holds a signed offset which is added to SELN to select which link
to activate when SELM is <q>Specified</q>. If the resulting value is outside the
range 0 .. 15 the record will go into a SOFT/INVALID alarm state. The default
value of OFFS is zero, so if it is not explicitly set and SELN is 1 the LNK1
link will be activated.</dd>
<dt><b>SHFT</b></dt>
<dd>When SELM is <q>Mask</q> the signed field SHFT is used to shift the SELN
value by SHFT bits (positive means right-wards, values outside the range -15 ..
15 will result in a SOFT/INVALID alarm), before using the resulting bit-pattern
to control which links to activate. The default value is -1, so if SHFT is not
explicitly set bit 0 of SELN will be used to control whether LNK1 gets
activated.</dd>
</dl>
<p>The record also now posts monitors on the SELN field if it changes as a
result of record processing (i.e. when read through the SELL link).</p>
<h3>Deleted Java build rules</h3>
<p>Java has its own build systems now, so we've deleted the rules and associated