2. Support
  3. AR# 10495: 3.4 FPGA Express - FPGA Express Constraints Editor does not display top-level clock

AR# 10495

3.4 FPGA Express - FPGA Express Constraints Editor does not display top-level clock

Description

Keywords: FPGA, Express, 3.4, constraints

Urgency: Standard

General Description:
When a design has a clock input going to multiple instantiated modules, the
top-level design is also using the clock in a process/always statement; the top-
level clock may not appear in the Synthesis Constraints editor in FPGA Express
3.4 (The clock that does appear in the Synthesis Constraints editor is a lower-
level modules clock.)

Solution

This is fixed in FPGA Express 3.5. In the 3.5 version, the
top-level clock is referenced in the Synthesis Constraints
editor.
AR# 10495
Date 08/28/2001
Status Archive
Type General Article