Controlling Design Implementation
CPLD Schematic Design Guide
3-17
select
Multiply by
or
Divide by
and a value in the Factor
text box.
5.
Click
OK
.
Pad to Setup
Pad to Setup creates a constraint which allows you to specify the
timing relationship between an external clock and data at the pins of
a device. The Global tab window generates a dialog box from which
you can specify a pad to setup requirement for all inputs that are
clocked by the clock net identified by the user.
1.
In the Pad to Setup column and in the row associated with the
appropriate clock net name, double-click the left mouse button.
This opens the Pad to Setup dialog box.
Note:
An alternate way to invoke the Pad to Setup dialog box: right
click in any row or column (except the heading), then click
Pad to
Setup
from the pop-up window.
2.
Enter a time requirement in the Time Requirement text box and
the desired unit from the pull-down list.
Note:
The Relative to Clock Net field contains the name that you
selected in Step 1. You are not allowed to change this field.
3.
Click
OK
.
Clock to Pad
This creates a constraint which allows you to specify the timing rela-
tionship between an external clock and data at the pins of a device.
The Global tab window generates a dialog box from which you can
specify a time requirement for a global clock.
1.
In the Clock to Pad column and in the row associated with the
appropriate clock net name, double-click the left mouse button.
This opens the Clock to Pad dialog box.
Note:
An alternate way to invoke the Clock to Pad dialog box: right
click in any row or column (except the heading), then click
Clock
to Pad
from the pop-up window.
2.
Enter a time requirement in the Time Requirement text box and
the desired unit from the pull-down list.
Summary :
The Global tab window generates a dialog box from which you can specify a pad to setup requirement for all inputs that are clocked by the clock net identified by the user. Note: An alternate way to invoke the Clock to Pad dialog box: right click in any row or column (except the heading), then click Clock to Pad from the pop-up window.
Tags :
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