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Table 5-1:
Chapter 5: Design Constraints
XST-Specific Non-timing Options
Constraint
Name
XCF
Constraint
Syntax
Value
XCF
Constraint
Syntax
Target
translate_on
na
na
use_carry_chain
yes, no,
true, false
Uselowskewlines
xor_collapse
Cmd
Line
no
Command
Line
/
Old XST
Constraint
Syntax
Value
Command
Line
/
Old XST
Constraint
Syntax
Target
Technology
no value
local,
no target
Spartan™-II/IIE/3,
Virtex™/II/II Pro/
II Pro X/E, XC9500™,
CoolRunner™
XPLA3/II/IIS
model,
yes
net (in model)
yes, no
entity, signal
Spartan™-II/IIE/3,
Virtex™/II/II Pro/
II Pro X/E
yes, true
net (in model) no
yes
signal
Spartan™-II/IIE/3,
Virtex™/II/II Pro/
II Pro X/E
yes, no
true, false
model,
yes
net (in model)
yes, no
entity, signal
Spartan™-II/IIE,3
Virtex™/II/II Pro/
II Pro X/E
XST Command Line Only Options
bufg
na
na
yes
integer
na
XC9500™,
CoolRunner™
XPLA3/II/IIS
bus_delimiter
na
na
yes
< >, [ ], { },
()
na
Spartan™-II/IIE/3,
Virtex™/II/II Pro/
II Pro X/E, XC9500™,
CoolRunner™
XPLA3/II/IIS
case
na
na
yes
upper,
lower,
maintain
na
Spartan™-II/IIE/3,
Virtex™/II/II Pro/
II Pro X/E, XC9500™,
CoolRunner™
XPLA3/II/IIS
hierarchy_separator
na
na
yes
_,/
(default is _)
na
Spartan™-II/IIE/3,
Virtex™/II/II Pro/
II Pro X/E, XC9500™,
CoolRunner™
XPLA3/II/IIS
iobuf
na
na
yes
yes, no
na
Spartan™-II/IIE/3,
Virtex™/II/II Pro/
II Pro X/E, XC9500™,
CoolRunner™
XPLA3/II/IIS
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XST User Guide