DS-FND-BSX-PC Xilinx Inc, DS-FND-BSX-PC Datasheet - Page 297

• 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
Basic UCF Syntax Examples
TPTHRU
TSidentifier
U_SET
USE_RLOC
VOLTAGE
WIREAND
XBLKNM
**The CONFIG attribute configures internal options of an XC3000 CLB or IOB. Do not confuse this attribute
***INIT is allowed in the UCF for CPLDs only.
*Use cautiously — although the constraint is available, there are differences between the UCF/NCF and
PCF syntax.
with the CONFIG primitive, which is a table containing PROHIBIT and PART attributes.
Attribute/Constraint
PERIOD Timespec
FROM:TO Timespecs
Table B-2 Constraint Applicability Table
The following sections summarize the functions of timespecs.
The PERIOD spec covers all timing paths that start or end at a
register, latch, or synchronous RAM which are clocked by the refer-
ence net (excluding pad destinations). Also covered is the setup
requirement of the synchronous element relative to other elements
(for example, flip flops, pads, and so forth).
Note: The default unit for time is nanoseconds.
NET clk20MHz PERIOD = 50 ;
NET clk50mhz TNM = clk50mhz ;
TIMESPEC TS01 = PERIOD : clk50mhz : 20 ;
FROM:TO style timespecs can be used to constrain paths between
time groups.
Note: Keywords: RAMS, FFS, PADS, and LATCHES are predefined
time groups used to specify all elements of each type in a design.
Design
NCF
UCF
Foundation Constraints
CE
PCF
*
B-25