DS-FND-BSX-PC Xilinx Inc, DS-FND-BSX-PC Datasheet - Page 301

• Manufacturer Part Number: DS-FND-BSX-PC
• Description: FOUNDATION BASE SYS W/SYN EXPRES
• Manufacturer: Xilinx Inc
• Type: Foundation Systemr

Specifications of DS-FND-BSX-PC

• For Use With/related Products: Xilinx Programmable Logic Devices
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 122-1185

Foundation Series 2.1i User Guide
User Constraint File Example
The user constraint file (.ucf) is a user-created ASCII file that holds
timing and location constraints. It is read by NGDBuild during the
translate process and is combined with an EDIF or XNF netlist into an
NGD file. If a UCF file exists with the same name as the top-level
netlist, then it will automatically be read. Otherwise, specify a file for
User Constraints in the Implement Control Files Settings dialog box.
For Foundation 2.1i, if you already have an existing UCF file
associated with a Revision, this UCF file is automatically copied and
used as your UCF file within a new revision.
The following example shows how to lock I/Os to pin locations and
how to write Timespec and Timegroup constraints.
Note: You can also lock pin locations within the Project Manager by
selecting Tools
Figure B-2 Locking I/Os to Pin Locations
IPAD
IPAD8
FRED
JIM[7:0]
Schematic of Hierarchy Block
LOU[7:0]
IBUF
Implementation
IBUF8
IBUF8
TED
IT[7:0]
JACK[7:0]
OBUF
OPAD8
NED
Hierarchy Block
LOU[7:0]
Lock Device Pins.
OPAD
X8076
Foundation Constraints
B-29