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Warp-SE/cpld/XC95144/MXSE_html/fit/optionsdoc.htm
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<title>Compiler Options</title>
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<h1>Compiler Options</h1>
<p class="whs1">The Compiler
Options page provides all the fitter options settings for the device family
the fitter has selected.</p>
<h1 class="whs2">Fitter Options</h1>
<p class="whs3"><a href="#Basic Tab"
style="font-family: arial, sans-serif; font-size: 10pt;"><span
style="font-family: arial, sans-serif; font-size: 10pt;"><FONT SIZE=2 style="font-size:10pt;">Basic Tab</a></FONT></span></p>
<p class="whs4"><a href="#XPLA Advanced Options"
style="font-family: arial, sans-serif; font-size: 10pt;"><span
style="font-family: arial, sans-serif; font-size: 10pt;"><FONT SIZE=2 style="font-size:10pt;">XPLA3 Advanced
Options</a></FONT></span></p>
<p class="whs5"><a href="#CoolRunner-II Advanced Options"
style="font-family: arial, sans-serif; font-size: 10pt;"><span
style="font-family: arial, sans-serif; font-size: 10pt;"><FONT SIZE=2 style="font-size:10pt;">CoolRunner-II
Advanced Options</a></FONT></span></p>
<p class="whs6"><a href="#XC9500/XL/XV Advanced Options"
style="font-family: arial, sans-serif; font-size: 10pt;">XC9500/XL/XV
Advanced Options</a></p>
<h2 class="whs7"><a name="Basic Tab"></a>Basic
Tab</h2>
<p class=whs1
style="font-family: arial, sans-serif; font-size: 10pt;">The CPLD devices
have the following fitter <span style="font-weight: bold;"><B><b>Implementation
Options </B></span><span style="font-weight: bold;"><B>available</B></span></b> in
the <span style="font-weight: bold;"><B>Basic</B></span> tab:</p>
<ul>
<li class=kadov-h4><h4 class="whs8">Use
Multi-Level Logic Optimization</h4></li>
</ul>
<p class="whs9">This option simplifies the total number
of logic expressions in a design, and then collapses the logic in order
to meet user objectives such as density, speed and timing constraints.
This optimization targets CPLD architecture, making it possible to collapse
to the macrocell limits, reduce levels of logic, and minimize the total
number of p-terms.</p>
<p class="whs10">Multi-level Logic Optimization optimizes
all combinatorial logic arcs spanning from an input pad or register output
to an output pad or register input.</p>
<p class="whs11">Multi-level Logic Optimization operates
on combinatorial logic according to the following rules.</p>
<p class="whs12">If timing constraints are set, the program
optimizes for speed to meet timing constraints.</p>
<p class="whs13">If timing constraints are not set, the
program optimizes either for speed or density, depending on the user setting
for the <span style="font-weight: bold;"><B>Use Timing Optimization</B></span>
option.</p>
<ul>
<ul class=whs1
style="list-style: disc;"
type=disc>
<ul class=whs2
style="list-style: circle;"
type=circle>
<li class=kadov-p><p class="whs14">If
<span style="font-weight: bold;"><B>Use Timing Optimization</B></span> is turned
on, the combinatorial logic will be mapped for speed.</p></li>
<li class=kadov-p-Cwhs3><p class=whs3
style="font-family: arial; font-size: 10pt;">If
<span style="font-weight: bold;"><B>Use Timing Optimization</B></span> is turned
off, the combinatorial logic will be mapped for density. The goal of optimization
will then be to reduce the total number of p-terms.</p></li>
</ul>
</ul>
</ul>
<p class="whs15"><font style="font-family: arial; font-size: 10pt;"
face=arial
size=2><span style="font-size: 10pt;"><FONT SIZE=2 style="font-size:10pt;">Logic
marked with the </FONT></span><span style="font-weight: bold;"><B><b style="font-size: 10pt;">NOREDUCE</b></B></span><span
style="font-size: 10pt;"><FONT SIZE=2 style="font-size:10pt;"> property will not be extracted or optimized.</FONT></span></font></p>
<p class=whs3
style="font-family: arial, sans-serif;
font-size: 10pt;
font-weight: bold;
margin-left: 40px;"><span style="font-family: arial; font-weight: normal;">By
default, this option is on.</span> </p>
<ul>
<li class=kadov-p-Cwhs3><p class=whs3
style="font-family: arial, sans-serif;
font-size: 10pt;
font-weight: bold;"><b style="font-weight: bold;"><span
style="font-weight: bold;"><B>Use Timing Constraints -- </B></span><span style="font-weight: normal;">This
option instructs the fitter use Timing Constraints when fitting the design.
<!--kadov_tag{{<spaces>}}-->&nbsp;<!--kadov_tag{{</spaces>}}-->If this
box is not checked, the fitter will ignore timing constraints, if necessary.</span></b></p></li>
<li class=kadov-p-Cwhs3><p class=whs3
style="font-family: arial, sans-serif; font-size: 10pt;"><b
style="font-weight: bold;"><span style="font-weight: bold;"><B>Enable WYSIWYG
Mode -- (CoolRunner only) </B></span><span style="font-weight: normal;">T</span></b>he
goal of the WYSIWYG options is to have a netlist reflect the user's specifications,
as much as possible. All the nodes declared in the HDL design are preserved.
By default, this property is set to Off (Checkbox is not checked) When
this property is On (checkbox is checked), XST:</p></li>
<ul>
<li style="list-style: circle;"
type=circle
class=kadov-p-Cwhs3><p class=whs3
style="font-family: arial, sans-serif; font-size: 10pt;">Preserves
all the user internal signals (nodes)</p></li>
<li style="list-style: circle;"
type=circle
class=kadov-p-Cwhs3><p class=whs3
style="font-family: arial, sans-serif; font-size: 10pt;">Creates
source_node constraints in NGC file for all these nodes.</p></li>
<li style="list-style: circle;"
type=circle
class=kadov-p-Cwhs3><p class=whs3
style="font-family: arial, sans-serif; font-size: 10pt;">Skips
the design optimization (collapse, factorization). Only the Boolean equation
minimization is performed.</p></li>
</ul>
<li class=kadov-p-Cwhs3><p class=whs3
style="font-family: arial, sans-serif; font-size: 10pt;"><b><span
style="font-weight: bold;"><B>Optimization Style</B></span></b>-- The Optimization
Method allows you to select from one of two basic optimization strategies:
<span style="font-weight: bold;"><B><b>Density</b></B></span> or <span style="font-weight: bold;"><B><b>Speed</b></B></span>.
<span style="font-weight: bold;"><B><b>Density</b></B></span> focuses on solely
on density, and <span style="font-weight: bold;"><B><b>Speed</b></B></span> focuses
solely on speed.</p></li>
<li class=kadov-p><p class="whs16"><span
style="font-weight: bold;"><B>Location Constraints</B></span> -- The Try selection
will attempt to fit the design with the pin assignments specified in the
design source. If the design cannot be fit with these pin assignments,
the fitter will remove the location constraints and attempt to fit the
design with no location constraints. A warning message will tell the user
if the location constraints have been removed.</p></li>
<ul class=whs5
style="list-style: circle;"
type=circle>
<li class=kadov-p><p class="whs17">The
<span style="font-weight: bold;"><B><b>Try</b></B></span> selection will attempt
to fit the design with the pin assignments specified in the design source.
If the design cannot be fit with these pin assignments, the fitter will
ignore the pin assignments.</p></li>
</ul>
<li style="list-style: circle;"
type=circle
class=kadov-p-Cwhs6><p class=whs6
style="font-family: arial, sans-serif; font-size: 10pt;">The
<span style="font-weight: bold;"><B>On </B></span>selection will attempt to fit
the design with the pin assignments specified in the design source. If
the design cannot be fit with these pin assignments, the fitter will notify
the user that the device could not fit. It will not unlock the pins under
this option.</p></li>
<li style="list-style: circle;"
type=circle
class=kadov-p-Cwhs7><p class=whs7
style="font-family: arial, sans-serif; font-size: 10pt;">The
<span style="font-weight: bold;"><B>Off</B></span> selection will attempt to
fit the design and will ignore the pin assignments specified in the design
source. If the design can be fit with no pre-assigned pins, the fitter
will assign pins, which can be viewed in the fitter report (filename.fit).
The user should take these pin assignments and incorporate them back into
the design source file. The user will be notified whether the fitting
operation was successful.</p></li>
<li class=kadov-p-Cwhs8><p class=whs8
style="font-family: arial, sans-serif;
font-size: 10pt;
font-weight: bold;"><b><span style="font-weight: bold;"><B>Output
Slew Rate -- </B></span></b><span style="font-weight: normal;">Use this option
to control the default output slew rate. You can control the transition
time of device output pins by setting the slew rate to Slow or Fast. Limiting
the slew rate (Slow) reduces output switching surges in the device. The
default is Fast.</span></p></li>
</ul>
<p class="whs18"><span style="font-weight: bold;"><B>Note</B></span>:
Any explicit slew rate control properties in the design or constraints
file take precedence over this Output Slew Rate setting. </p>
<ul>
<li class=kadov-p-Cwhs8><p class=whs8
style="font-family: arial, sans-serif;
font-size: 10pt;
font-weight: bold;"><b style="font-weight: bold;"><span
style="font-weight: bold;"><B>FF Initial State -- </B></span><span style="font-weight: normal;">Sets
the initial state for all Flip-Flops. <!--kadov_tag{{<spaces>}}-->&nbsp;<!--kadov_tag{{</spaces>}}-->The
options are Low, High and FPGA.</span></b></p></li>
<li class=kadov-p-Cwhs8><p class=whs8
style="font-family: arial, sans-serif;
font-size: 10pt;
font-weight: bold;"><b><span style="font-weight: bold;"><B>Collapsing
P-Term Limit -- </B></span></b><span style="font-weight: normal;">This option
controls the degree to which the fitter flattens a design netlist. A logic
gate can collapse forward into a subsequent gate only if the number of
product terms in the resulting logic function does not exceed the p-term
limit. If the path delay of a logic function is not acceptable, increase
the p-term limit to allow the larger functions to be further flattened.
Choose a number from 3 to 48.</span> </p></li>
<li class=kadov-p-Cwhs8><p class=whs8
style="font-family: arial, sans-serif;
font-size: 10pt;
font-weight: bold;"><b><span style="font-weight: bold;"><B>Collapsing
Input Limit -- </B></span></b><span style="font-weight: normal;">This is a
secondary option for controlling the degree to which the fitter flattens
a design netlist. A logic gate can collapse forward into a subsequent
gate only if the number of inputs in the resulting logic function does
not exceed the input limit. If the design fails to fit the target device
because flattening uses up too many of the function block inputs, decrease
the input limit to prevent flattening of certain high fan-in functions.
</span><!--kadov_tag{{<spaces>}}-->&nbsp;<!--kadov_tag{{</spaces>}}--></p></li>
</ul>
<h2 class="whs19"><b><span
style="font-weight: bold;"><B><a name="XPLA Advanced Options"></a>XPLA Advanced
Options</B></span></b></h2>
<p class="whs20"><b><span style="font-weight: normal;">The
following options are available under XPLA </span><span style="font-weight: bold;"><B>Implementation
Options</B></span><span style="font-weight: normal;">, </span><span style="font-weight: bold;"><B>Advanced</B></span><span
style="font-weight: normal;"> tab.</span></b></p>
<ul>
<li class=kadov-p-Cwhs8><p class=whs8
style="font-family: arial, sans-serif;
font-size: 10pt;
font-weight: bold;">Enable Fast
Input Registers -<span style="font-weight: normal;">- Enables the use
of the Fast Input path in XPLA3 devices.</span></p></li>
<li class=kadov-p-Cwhs8><p class=whs8
style="font-family: arial, sans-serif;
font-size: 10pt;
font-weight: bold;">Enable Use
of Foldback NANDs -- <span style="font-weight: normal;">When selected,
the software will use foldback NANDs. This increases the capability to
fit a design, sometimes at the expense of speed.</span></p></li>
<li class=kadov-p-Cwhs8><p class=whs8
style="font-family: arial, sans-serif; font-size: 10pt;"><span
style="font-weight: bold;"><B>Reserve JTAG Pins for ISP -- </B></span>Checking
this box will instruct the fitter to reserve JTAG pins.</p></li>
</ul>
<h2 class="whs21"><a name="CoolRunner-II Advanced Options"></a>CoolRunner-II
Advanced Options</h2>
<p class="whs22">The following
options are found under the Advanced tab for CoolRunner-II devices.</p>
<ul type="disc" class="whs23">
<li class=kadov-h4><h4 class="whs24">Use
Global Clock(s) -- <span style="font-weight: normal;">Select this option
to allow the fitter to assign input pins used as clocks to dedicated global
clock (GCK) pins of the device. If this option is disabled, only pins
identified with the BUFG=CLK property in the design (or UCF file) will
be assigned to GCK device pins. By default, this option is on.</span>
</h4></li>
<li class=kadov-p><p class="whs25"><span
style="font-weight: bold;"><B>Use Global Output Enable(s)</B></span> -- Select
this option to allow the fitter to assign input pins used as output enable
control to dedicated global OE (GTS) pins of the device. If this option
is disabled, only pins identified with the BUFG=OE property in the design
(or UCF file) will be assigned to GTS device pins. By default, this option
is on. </p></li>
<li class=kadov-p><p class="whs26"><span
style="font-weight: bold;"><B>Use Global Set/Reset</B></span> -- Select this
option to allow the fitter to assign input pins used as register asynchronous
reset or preset control to the dedicated global set/reset (GSR) pin of
the device. If this option is disabled, only a pin identified with the
BUFG=SR property in the design (or UCF file) will be assigned to the GSR
device pin. By default, this option is on.</p></li>
<li class=kadov-p><p class="whs27"><span
style="font-weight: bold;"><B>Enable Fast Input Registers</B></span> -- Enables
fast input registers.</p></li>
<li class=kadov-p><p class="whs28"><span
style="font-weight: bold;"><B>Ignore DATA_GATE Attributes</B></span> -- Data
Gate is a power saving property that can be used in CoolRunner-II designs.
<!--kadov_tag{{<spaces>}}-->&nbsp;<!--kadov_tag{{</spaces>}}-->This option
allows you to turn Data Gate off in case you want the fitter to ignore
data gate.</p></li>
<li class=kadov-p><p class="whs29"><span
style="font-weight: bold;"><B>Tristate Outputs Termination Node</B></span> --
The Tristate Output Termination Mode globally sets all tristate outputs
to the specified termination mode. By default, this field is set to Pullup..
<!--kadov_tag{{<spaces>}}-->&nbsp;<!--kadov_tag{{</spaces>}}-->The options
are Pullup, Keeper and Float.</p></li>
<li class=kadov-p><p class="whs30"><span
style="font-weight: bold;"><B>Create Programmable Ground Pins on Unused I/O</B></span>
-- The Create Programmable GND Pins on Unused I/O property controls the
option to indicate that you want all unused I/O pads to be configured
as ground pins. This can reduce ground bounce. By default, this option
is set to ground. <!--kadov_tag{{<spaces>}}-->&nbsp;<!--kadov_tag{{</spaces>}}-->The
options are Ground, Pullup, Keeper and Float.</p></li>
<li class=kadov-p>
<p class="whs31"><span style="font-weight: bold;"><B>Default
Output Voltage Standard</B></span> -- set a default voltage standard for CoolRunner-II
device pins.</p>
<p class="whs32">IOSTANDARD
names supported by CoolRunner-II are:</p>
<!--(Table)=====================================================-->
<table x-use-null-cells width="84.797%" cellspacing="0" class="whs33">
<col class="whs34">
<col class="whs35">
<col class="whs36">
<col class="whs37">
<tr valign=top>
<td width="20.209%" class="whs38">
<p class="whs39">I/O Standard</td>
<td width="16.192%" class="whs40">
<p align="center" class="whs41">VCC<span style="vertical-align: Sub;">IO</span></td>
<td width="22.217%" class="whs42">
<p align="center" class="whs43">Input V<span style="vertical-align: Sub;">REF</span></td>
<td width="41.383%" class="whs44">
<p align="center" class="whs45">Board Termination Voltage (V<span style="vertical-align: Sub;">TT</span>)</td></tr>
<tr valign=top>
<td width="20.209%" class="whs46">
<p class="whs47">LVTTL </td>
<td width="16.192%" class="whs48">
<p align="center" class="whs49">3.3V</td>
<td width="22.217%" class="whs50">
<p align="center" class="whs51">N/A</td>
<td width="41.383%" class="whs52">
<p align="center" class="whs53">N/A</td></tr>
<tr valign=top>
<td width="20.209%" class="whs54">
<p class="whs55">LVCMOS33</td>
<td width="16.192%" class="whs56">
<p align="center" class="whs57">3.3V</td>
<td width="22.217%" class="whs58">
<p align="center" class="whs59">N/A</td>
<td width="41.383%" class="whs60">
<p align="center" class="whs61">N/A</td></tr>
<tr valign=top>
<td width="20.209%" class="whs62">
<p class="whs63">LVCMOS25</td>
<td width="16.192%" class="whs64">
<p align="center" class="whs65">2.5V</td>
<td width="22.217%" class="whs66">
<p align="center" class="whs67">N/A</td>
<td width="41.383%" class="whs68">
<p align="center" class="whs69">N/A</td></tr>
<tr valign=top>
<td width="20.209%" class="whs70">
<p class="whs71">LVCMOS18</td>
<td width="16.192%" class="whs72">
<p align="center" class="whs73">1.8V</td>
<td width="22.217%" class="whs74">
<p align="center" class="whs75">N/A</td>
<td width="41.383%" class="whs76">
<p align="center" class="whs77">N/A</td></tr>
<tr valign=top>
<td width="20.209%" class="whs78">
<p class="whs79">LVCMOS15</td>
<td width="16.192%" class="whs80">
<p align="center" class="whs81">1.5V</td>
<td width="22.217%" class="whs82">
<p align="center" class="whs83">N/A</td>
<td width="41.383%" class="whs84">
<p align="center" class="whs85">N/A</td></tr>
<tr valign=top>
<td width="20.209%" class="whs86">
<p class="whs87">HSTL_I</td>
<td width="16.192%" class="whs88">
<p align="center" class="whs89">1.5V</td>
<td width="22.217%" class="whs90">
<p align="center" class="whs91">0.75V</td>
<td width="41.383%" class="whs92">
<p align="center" class="whs93">0.75V</td></tr>
<tr valign=top>
<td width="20.209%" class="whs94">
<p class="whs95">SSTL2_I</td>
<td width="16.192%" class="whs96">
<p align="center" class="whs97">2.5V</td>
<td width="22.217%" class="whs98">
<p align="center" class="whs99">1.25V</td>
<td width="41.383%" class="whs100">
<p align="center" class="whs101">1.25V</td></tr>
<tr valign=top>
<td width="20.209%" class="whs102">
<p class="whs103">SSTL3_I</td>
<td width="16.192%" class="whs104">
<p align="center" class="whs105">3.3V</td>
<td width="22.217%" class="whs106">
<p align="center" class="whs107">1.5V</td>
<td width="41.383%" class="whs108">
<p align="center" class="whs109">1.5V</td></tr>
</table>
<p class="whs110">The software
automatically groups outputs with similar IOSTANDARD settings into the
same bank when no location constraints are specified. </p>
</li>
</ul>
<h2 class="whs111"><a name="XC9500/XL/XV Advanced Options"></a>XC9500/XL/XV
Advanced Options</h2>
<p class="whs112">The following
options are found under the Advanced tab for XC9500/XL/XV. <!--kadov_tag{{<spaces>}}-->&nbsp;<!--kadov_tag{{</spaces>}}-->Note
that additional options for XC9500 only are also described below.</p>
<ul type="disc" class="whs113">
<li class=kadov-h4><h4 class="whs114">Use
Global Clock(s) -- <span style="font-weight: normal;">Select this option
to allow the fitter to assign input pins used as clocks to dedicated global
clock (GCK) pins of the device. If this option is disabled, only pins
identified with the BUFG=CLK property in the design (or UCF file) will
be assigned to GCK device pins. By default, this option is on.</span>
</h4></li>
<li class=kadov-p><p class="whs115"><span
style="font-weight: bold;"><B>Use Global Output Enable(s)</B></span> -- Select
this option to allow the fitter to assign input pins used as output enable
control to dedicated global OE (GTS) pins of the device. If this option
is disabled, only pins identified with the BUFG=OE property in the design
(or UCF file) will be assigned to GTS device pins. By default, this option
is on. </p></li>
<li class=kadov-p><p class="whs116"><span
style="font-weight: bold;"><B>Use Global Set/Reset</B></span> -- Select this
option to allow the fitter to assign input pins used as register asynchronous
reset or preset control to the dedicated global set/reset (GSR) pin of
the device. If this option is disabled, only a pin identified with the
BUFG=SR property in the design (or UCF file) will be assigned to the GSR
device pin. By default, this option is on.</p></li>
<li class=kadov-p><p class="whs117"><span
style="font-weight: bold;"><B>Create Programmable Ground Pins on Unused I/O</B></span>
-- Select this option to indicate that you want all unused I/O pads to
be configured as ground pins. This can reduce ground bounce. By default,
this option is off.</p></li>
<li class=kadov-p><p class="whs118"><span
style="font-weight: bold;"><B>Macrocell Power Setting</B></span> -- Use this
option to control device power consumption. Select Low or Standard to
set the default power mode for the macrocells used to implement the design.
Select Timing Driven to automatically reduce power on paths covered by
timing specifications that can meet speed requirements while operating
in low power. The default is Standard, which results in highest speed.</p></li>
</ul>
<p class="whs119">Note: Any explicit power control (PWR_MODE)
properties in the design or constraints file take precedence over this
Macrocell Power Setting. </p>
<ul type="disc" class="whs120">
<li class=kadov-p><p class="whs121"><span
style="font-weight: bold;"><B>Enable FASTConnect/UIM Optimization (XC9500
only)</B></span> -- Enables optimization of the FASTConnect/UIM for XC9500
devices.</p></li>
<li class=kadov-h4><h4 class="whs122">Use
Local Feedback (XC9500 only)</h4></li>
</ul>
<p class="whs123">Select this option to enable the software
to use local macrocell feedback whenever possible. The local feedback
path, running from each macrocell output to an input of the same function
block, has shorter propagation delay than the global feedback path. The
fitter always tries to use local macrocell feedback (if possible) to satisfy
timing constraints. This option allows the fitter to use local feedback
to generally improve timing on remaining paths. Using local feedback can
speed up your design but could also make it difficult to maintain the
same timing after a design change. By default, this option is on.</p>
<!--(HR)============================================================-->
<hr class=whs4
style="margin-left: 40px; /*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ "
align=center>
<p class="whs124"><b><span style="font-weight: bold;"><B>Note:
</B></span></b>To force the fitter to use local feedback, manually map both
the source and load functions into the same function block using the property
<span style="font-weight: bold;"><B><b>LOC=FB</b></B></span><span style="font-style: italic;"><I><i>nn</i></I></span>,
then apply a timespec across the path.&nbsp;</p>
<!--(HR)============================================================-->
<hr class=whs5
style="margin-left: 40px; /*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ "
align=center>
<p class="whs125"><span><FONT SIZE=2 style="font-size:10pt;"><b style="font-weight: bold;">Note:
</b></FONT></span>The XC9536 device does not have local feedback.</p>
<!--(HR)============================================================-->
<hr class=whs6
style="margin-left: 40px; /*begin!kadov{{*/ float: aligncenter; /*}}end!kadov*/ "
align=center>
<ul type="disc" class="whs126">
<li class=kadov-h4><h4 class="whs127">Use
Pin Feedback (XC9500 only)</h4></li>
</ul>
<p class="whs128">Select this option to enable the software
to use I/O pin feedback whenever possible. The pin feedback path has slightly
shorter propagation delay than the global feedback path. If this option
is enabled, the software uses the pin feedback path instead of the global
feedback path for macrocell signals that do not drive 3-state outputs
or slew-rate-limited outputs, and where the associated I/O pin is not
used as input-only. By default, this option is on.</p>
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