CPLD Schematic Design Guide
3-20
Xilinx Development System
defined in a TIMESPEC primitive. Every TS attribute begins with the
letters ``TS" and ends with a unique identifier that can consist of
letters, numbers, or the underscore character (_).
Figure 3-2
TIMESPEC Primitive
A TS attribute defines the allowable delay for paths in your design.
The basic syntax for a TS attribute is:
TS
identifier
=FROM:
source_group
:TO:
dest_group
:
delay
where
TS
identifier is a unique name for the TS attribute, source_group
and dest_group are groups of start points and end points, and delay
defines the maximum delay for the paths between the start points
and end points. The delay parameter defines the maximum delay for
the attribute. Nanoseconds are the default units for specifying delay
time in TS attributes. You can also specify delay using other units,
such as picoseconds or megahertz.
Note:
Keywords, such as FROM, TO, and TS appear in the documen-
tation in upper case; however, you can enter them in the TIMESPEC
primitive in either upper or lower case. You cannot enter them in a
combination of lower and upper case.
The basic TS attribute is described in detail in the "Basic TIMESPEC
Syntax" section. More detailed forms of the attribute are also
described in that section.
X4332
TIMESPEC
TS01=FROM:FFS:TO:PADS=25
Summary :
The basic syntax for a TS attribute is: TS identifier =FROM: source_group :TO: dest_group : delay where TS identifier is a unique name for the TS attribute, source_group and dest_group are groups of start points and end points, and delay defines the maximum delay for the paths between the start points and end points.
Tags :
delay,attribute,timespec,points,identifier,upper,primitie,basic,case,defines,letters,lower,section