Xilinx Constraints Guide

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Chapter 2: Entry Strategies for Xilinx Constraints Constraint Schematic VHDL Verilog CONFIG_MODE Yes COOL_CLK Yes Yes Yes Yes DATA_GATE Yes Yes Yes Yes NCF UCF Constraints Editor PCF XCF Plan- Ahead DEFAULT Yes Yes Yes Yes Yes Yes Yes DCI_CASCADE Yes Yes Yes DCI_VALUE Yes Yes PACE FPGA Editor DIRECTED_ROUTING Yes Yes Yes DISABLE Yes Yes Yes DRIVE Yes Yes Yes Yes Yes Yes Yes Yes DROP_SPEC Yes Yes Yes Yes ENABLE Yes Yes Yes ENABLE_SUSPEND Yes Yes FAST Yes Yes Yes Yes Yes Yes Yes FEEDBACK Yes Yes Yes Yes Yes FILE Yes Yes FLOAT Yes Yes Yes Yes Yes FROM-THRU-TO Yes Yes Yes Yes Yes FROM-TO Yes Yes Yes Yes Yes Yes HBLKNM Yes Yes Yes Yes HLUTNM Yes Yes Yes Yes Yes Yes HU_SET Yes Yes Yes Yes Yes IBUF_DELAY_VALUE Yes Yes Yes Yes IFD_DELAY_VALUE Yes Yes Yes Yes INREG Yes Yes IOB Yes Yes Yes Yes Yes Yes IOBDELAY Yes Yes Yes Yes Yes IODELAY_GROUP Yes IOSTANDARD Yes Yes Yes Yes Yes Yes Yes Yes KEEP Yes Yes Yes Yes Yes KEEPER Yes Yes Yes Yes Yes Yes Yes KEEP_HIERARCHY Yes Yes Yes Yes Yes Yes LOC Yes Yes Yes Yes Yes Yes Yes Yes LOCATE Yes Yes LOCK_PINS Yes Yes Yes ISE® Design Suite Constraints Guide 26 www.xilinx.com UG625 (v. 13.2) July 6, 2011
Constraint Schematic VHDL Verilog LUTNM Yes Yes Yes Yes MAP Yes Yes Yes NCF UCF Constraints Editor Chapter 2: Entry Strategies for Xilinx Constraints PCF XCF Plan- Ahead MARK_DEBUG Yes Yes Yes PACE FPGA Editor MAXDELAY Yes Yes Yes Yes Yes Yes Yes MAX_FANOUT Yes Yes Yes MAXPT Yes Yes Yes MAXSKEW Yes Yes Yes Yes Yes Yes Yes NODELAY Yes Yes Yes Yes Yes IODELAY_GROUP Yes NOREDUCE Yes Yes Yes Yes Yes OFFSET IN Yes Yes Yes Yes Yes Yes Yes OFFSET OUT Yes Yes Yes Yes Yes Yes Yes OPEN_DRAIN Yes Yes Yes Yes Yes PERIOD Yes Yes Yes Yes Yes Yes Yes Yes Yes PIN Yes POST_CRC Yes Yes POST_CRC_ACTION Yes Yes POST_CRC_FREQ Yes Yes POST_CRC_INIT_FLAG Yes Yes PRIORITY Yes Yes Yes PROHIBIT Yes Yes Yes Yes Yes PULLDOWN Yes Yes Yes Yes Yes Yes Yes Yes PULLUP Yes Yes Yes Yes Yes Yes Yes Yes PWR_MODE Yes Yes Yes Yes Yes REG Yes Yes Yes Yes Yes RLOC Yes Yes Yes Yes Yes Yes RLOC_ORIGIN Yes Yes Yes Yes Yes Yes RLOC_RANGE Yes Yes Yes Yes Yes Yes SAVE NET FLAG Yes Yes Yes Yes Yes SCHMITT_TRIGGER Yes Yes Yes Yes Yes SLEW Yes Yes Yes Yes Yes Yes Yes Yes SLOW Yes Yes Yes Yes Yes Yes Yes Yes STEPPING Yes SUSPEND Yes Yes Yes Yes Yes SYSTEM_JITTER Yes Yes Yes Yes Yes TEMPERATURE Yes Yes Yes Yes TIG Yes Yes Yes Yes Yes Yes Yes ISE® Design Suite Constraints Guide UG625 (v. 13.2) July 6, 2011 www.xilinx.com 27
Page 1 and 2: Constraints Guide UG625 (v. 13.2) J
Page 3 and 4: Table of Contents Revision History
Page 5 and 6: IBUF_DELAY_VALUE (Input Buffer Dela
Page 7 and 8: Constraint Types Attributes and Con
Page 9 and 10: Grouping Constraints for Timing Cha
Page 11 and 12: The name qualifier can include the
Page 13 and 14: Physical Constraints Mapping Note T
Page 15 and 16: Placement Constraints Chapter 1: Co
Page 17 and 18: Routing Directives Routing directiv
Page 19 and 20: Timing Constraints Chapter 1: Const
Page 21 and 22: UCF Timing Constraint Support From-
Page 23 and 24: Timing Model Constraint Priority Ch
Page 25: Chapter 2 Entry Strategies for Xili
Page 29 and 30: An attribute can be declared in an
Page 31 and 32: User Constraints File (UCF) UCF Flo
Page 33 and 34: Syntax Chapter 2: Entry Strategies
Page 35 and 36: Entering Multiple Constraints File
Page 37 and 38: Chapter 2: Entry Strategies for Xil
Page 39 and 40: Running Constraints Editor As a Sta
Page 41 and 42: Defining I/O Pin Configurations Cha
Page 43 and 44: Placement LOC Constraint Assignment
Page 45 and 46: Verilog Example -------------module
Page 47 and 48: Chapter 2: Entry Strategies for Xil
Page 49 and 50: Timing Specification Priorities Cha
Page 51 and 52: Timing Constraint Strategies Chapte
Page 53 and 54: Chapter 3: Timing Constraint Strate
Page 55 and 56: The global OFFSET IN constraint for
Page 57 and 58: The PERIOD constraint syntax for th
Page 59 and 60: Example Chapter 3: Timing Constrain
Page 61 and 62: Chapter 3: Timing Constraint Strate
Page 63 and 64: The global OFFSET OUT constraints f
Page 65 and 66: Multi-Cycle Paths Chapter 3: Timing
Page 67 and 68: Xilinx Constraints Each Xilinx® co
Page 69 and 70: RANGE Chapter 4: Xilinx Constraints
Page 71 and 72: Chapter 4: Xilinx Constraints Range
Page 73 and 74: COMPRESSION GROUP PLACE Chapter 4:
Page 75 and 76: Defining From Timing Groups Chapter
Page 77 and 78:
BEL (BEL) The BEL (BEL) constraint:
Page 79 and 80:
BLKNM (Block Name) Architecture Sup
Page 81 and 82:
BUFG (BUFG) The BUFG (BUFG) constra
Page 83 and 84:
Clock Dedicated Route (CLOCK_DEDICA
Page 85 and 86:
COMPGRP (Component Group) Architect
Page 87 and 88:
• S_SELECTMAP16 Slave SelectMAP M
Page 89 and 90:
Verilog Syntax Chapter 4: Xilinx Co
Page 91 and 92:
Page 93 and 94:
PCF Syntax CONFIG DCI_CASCADE = ",
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Default (DEFAULT) Chapter 4: Xilinx
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Example (* KEEPER = “TRUE” *) D
Page 99 and 100:
DIFF_TERM (Diff_Term) Architecture
Page 101 and 102:
DIRECTED_ROUTING (Directed Routing)
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DISABLE (Disable) The DISABLE (Disa
Page 105 and 106:
DRIVE (Drive) The DRIVE (Drive) con
Page 107 and 108:
XCF Syntax MODEL “entity_name”
Page 109 and 110:
ENABLE (Enable) The ENABLE (Enable)
Page 111 and 112:
ENABLE_SUSPEND (Enable Suspend) Arc
Page 113 and 114:
Page 115 and 116:
Constraints Editor Syntax Chapter 4
Page 117 and 118:
VHDL Syntax Declare the VHDL constr
Page 119 and 120:
UCF and NCF Syntax NET “signal_na
Page 121 and 122:
Chapter 4: Xilinx Constraints You a
Page 123 and 124:
Page 125 and 126:
HBLKNM (Hierarchical Block Name) Ar
Page 127 and 128:
HIODELAY_GROUP (HIODELAY Group) Arc
Page 129 and 130:
Page 131 and 132:
HU_SET (HU Set) The HU_SET (HU Set)
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IBUF_DELAY_VALUE (Input Buffer Dela
Page 135 and 136:
IFD_DELAY_VALUE (IFD Delay Value) T
Page 137 and 138:
IN_TERM (In Term) Architecture Supp
Page 139 and 140:
INREG (Input Registers) Architectur
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IOB (IOB) The IOB constraint: • I
Page 143 and 144:
IOBDELAY (Input Output Block Delay)
Page 145 and 146:
IODELAY_GROUP (IODELAY Group) Limit
Page 147 and 148:
IOSTANDARD (Input Output Standard)
Page 149 and 150:
Pinout and Area Constraints Editor
Page 151 and 152:
Page 153 and 154:
Architecture Support Applicable Ele
Page 155 and 156:
Keeper (KEEPER) Architecture Suppor
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LOC (Location) The LOC (Location) c
Page 159 and 160:
Chapter 4: Xilinx Constraints The w
Page 161 and 162:
LOC Range Constraint Examples Const
Page 163 and 164:
PlanAhead Syntax Chapter 4: Xilinx
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Schematic LOC=P17 Chapter 4: Xilinx
Page 167 and 168:
Example One Chapter 4: Xilinx Const
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Slices Prohibited Example Two Chapt
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LOCK_PINS (Lock Pins) Architecture
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where value is any chosen name unde
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MAP (Map) Architecture Support Appl
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Specify the Verilog constraint as f
Page 179 and 180:
Architecture Support Applicable Ele
Page 181 and 182:
MAXDELAY (Maximum Delay) Architectu
Page 183 and 184:
PCF Syntax item MAXDELAY = maxvalue
Page 185 and 186:
MAXSKEW (Maximum Skew) The MAXSKEW
Page 187 and 188:
FPGA Editor Syntax Chapter 4: Xilin
Page 189 and 190:
MIODELAY_GROUP (MIODELAY Group) Arc
Page 191 and 192:
Page 193 and 194:
UCF and NCF Syntax Chapter 4: Xilin
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where Chapter 4: Xilinx Constraints
Page 197 and 198:
Falling Edge Constraints Chapter 4:
Page 199 and 200:
PlanAhead Syntax Chapter 4: Xilinx
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where Chapter 4: Xilinx Constraints
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UCF Syntax NET “clock” TNM_NET
Page 205 and 206:
Page 207 and 208:
Attribute OUT_TERM: string; Specify
Page 209 and 210:
TIMESPEC PERIOD Method Chapter 4: X
Page 211 and 212:
Examples of a Primary Clock with De
Page 213 and 214:
where • period is the required cl
Page 215 and 216:
New PERIOD Specifications Output Pi
Page 217 and 218:
Post CRC (POST_CRC) Architecture Su
Page 219 and 220:
Post CRC Frequency (POST_CRC_FREQ)
Page 221 and 222:
Post CRC Signal (POST_CRC_SIGNAL) A
Page 223 and 224:
PRIORITY (Priority) Architecture Su
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The following are not supported: Ch
Page 227 and 228:
PULLDOWN (Pulldown) Architecture Su
Page 229 and 230:
PULLUP (Pullup) Architecture Suppor
Page 231 and 232:
PWR_MODE (Power Mode) Architecture
Page 233 and 234:
REG (Registers) The REG (Registers)
Page 235 and 236:
RLOC (Relative Location) The Relati
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RLOC = X3Y4 Chapter 4: Xilinx Const
Page 239 and 240:
Linking Sets Set Linkage Chapter 4:
Page 241 and 242:
Chapter 4: Xilinx Constraints by th
Page 243 and 244:
Linking Two HU_SET Sets Chapter 4:
Page 245 and 246:
Specify the VHDL constraint as foll
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Chapter 4: Xilinx Constraints Diffe
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H_SET (H Set) Chapter 4: Xilinx Con
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Chapter 4: Xilinx Constraints The n
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Syntax Examples Chapter 4: Xilinx C
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RLOC_RANGE (Relative Location Range
Page 257 and 258:
where the relative X values (m1 and
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Page 261 and 262:
UCF and NCF Syntax NET “mysignal
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Page 265 and 266:
VHDL Syntax Chapter 4: Xilinx Const
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SLOW (Slow) The SLOW (Slow) constra
Page 269 and 270:
STEPPING (Stepping) Architecture Su
Page 271 and 272:
VHDL Syntax Chapter 4: Xilinx Const
Page 273 and 274:
Page 275 and 276:
Page 277 and 278:
Chapter 4: Xilinx Constraints The f
Page 279 and 280:
TIMEGRP (Timing Group) The TIMEGRP
Page 281 and 282:
Defining Latch Subgroups by Gate Se
Page 283 and 284:
Chapter 4: Xilinx Constraints When
Page 285 and 286:
PCF Syntax TIMEGRP name; TIMEGRP na
Page 287 and 288:
Separators FROM-TO Syntax TIMESPEC
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TNM (Timing Name) Chapter 4: Xilinx
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Chapter 4: Xilinx Constraints A qua
Page 293 and 294:
TNM_NET (Timing Name Net) The TNM_N
Page 295 and 296:
Schematic Syntax • Attach to a ne
Page 297 and 298:
TPSYNC (Timing Point Synchronizatio
Page 299 and 300:
UCF and NCF Syntax NET “net_name
Page 301 and 302:
Using TPTHRU in a FROM TO Constrain
Page 303 and 304:
TSidentifier (Timing Specification
Page 305 and 306:
Ignoring Paths Note This form is no
Page 307 and 308:
Page 309 and 310:
Page 311 and 312:
Page 313 and 314:
Chapter 4: Xilinx Constraints If yo
Page 315 and 316:
Use Low Skew Lines (USELOWSKEWLINES
Page 317 and 318:
VCCAUX (VCCAUX) Architecture Suppor
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Page 321 and 322:
VREF (VREF) The VREF (VREF) constra
Page 323 and 324:
XBLKNM (XBLKNM) Architecture Suppor
Page 325:
Additional Resources Appendix • X
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