Xilinx Constraints Guide

More documents

Recommendations

Info

Chapter 4: Xilinx Constraints TEMPERATURE (Temperature) The TEMPERATURE (Temperature) constraint: • Is a timing constraint. Architecture Support • Allows the specification of the operating junction temperature. • Provides a means of prorating device delay characteristics based on the specified temperature. Prorating is a scaling operation on existing speed file delays and is applied globally to all delays. Newer devices may not support TEMPERATURE prorating until the timing information (speed files) are marked as production status. Each architecture has its own specific range of valid operating temperatures. If the entered temperature does not fall within the supported range, TEMPERATURE is ignored and an architecture-specific worst-case value is used instead. Also note that the error message for this condition does not appear until static timing. • Spartan®-3A • Spartan-3E • Virtex®-4 • Virtex-5 Applicable Elements Propagation Rules Applies globally to the entire design. This constraint is a design element constraint. Any attachment to a net is illegal. Syntax The following examples show how to use this constraint with particular tools or methods. If a tool or method is not listed, you cannot use this constraint with it. UCF and NCF Syntax TEMPERATURE=value [C |F| K]; where value • is a real number specifying the temperature • C, K, and F are the temperature units – F is degrees Fahrenheit – K is degrees Kelvin – C is degrees Celsius (default) The following statement specifies that the analysis for everything relating to speed file delays assumes a junction temperature of 25 degrees Celsius. TEMPERATURE=25 C; Constraints Guide 274 www.xilinx.com UG625 (v. 13.2) July 6, 2011
Constraints Editor Syntax Chapter 4: Xilinx Constraints For information on setting constraints in Constraints Editor, including syntax, see the Constraints Editor Help. Constraints Guide UG625 (v. 13.2) July 6, 2011 www.xilinx.com 275
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 and 26:
Chapter 2 Entry Strategies for Xili
Page 27 and 28:
Constraint Schematic VHDL Verilog L
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 = ",
Page 95 and 96:
Default (DEFAULT) Chapter 4: Xilinx
Page 97 and 98:
Example (* KEEPER = “TRUE” *) D
Page 99 and 100:
DIFF_TERM (Diff_Term) Architecture
Page 101 and 102:
DIRECTED_ROUTING (Directed Routing)
Page 103 and 104:
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:
Constraints Editor Syntax Chapter 4
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)
Page 133 and 134:
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
Page 141 and 142:
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
Page 157 and 158:
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
Page 165 and 166:
Schematic LOC=P17 Chapter 4: Xilinx
Page 167 and 168:
Example One Chapter 4: Xilinx Const
Page 169 and 170:
Slices Prohibited Example Two Chapt
Page 171 and 172:
LOCK_PINS (Lock Pins) Architecture
Page 173 and 174:
where value is any chosen name unde
Page 175 and 176:
MAP (Map) Architecture Support Appl
Page 177 and 178:
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
Page 195 and 196:
where Chapter 4: Xilinx Constraints
Page 197 and 198:
Falling Edge Constraints Chapter 4:
Page 199 and 200:
PlanAhead Syntax Chapter 4: Xilinx
Page 201 and 202:
where Chapter 4: Xilinx Constraints
Page 203 and 204:
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
Page 225 and 226: 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
Page 237 and 238: 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
Page 247 and 248: Chapter 4: Xilinx Constraints Diffe
Page 249 and 250: H_SET (H Set) Chapter 4: Xilinx Con
Page 251 and 252: Chapter 4: Xilinx Constraints The n
Page 253 and 254: Syntax Examples Chapter 4: Xilinx C
Page 255 and 256: RLOC_RANGE (Relative Location Range
Page 257 and 258: where the relative X values (m1 and
Page 259 and 260: VHDL Syntax Declare the VHDL constr
Page 261 and 262: UCF and NCF Syntax NET “mysignal
Page 263 and 264: Verilog Syntax Chapter 4: Xilinx Co
Page 265 and 266: VHDL Syntax Chapter 4: Xilinx Const
Page 267 and 268: 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: Verilog Syntax Chapter 4: Xilinx Co
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
Page 289 and 290: TNM (Timing Name) Chapter 4: Xilinx
Page 291 and 292: 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: VHDL Syntax Declare the VHDL constr
Page 309 and 310: UCF and NCF Syntax Chapter 4: Xilin
Page 311 and 312: Verilog Syntax Chapter 4: Xilinx Co
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
Page 319 and 320: UCF and NCF Syntax Chapter 4: Xilin
Page 321 and 322: VREF (VREF) The VREF (VREF) constra
Page 323 and 324: XBLKNM (XBLKNM) Architecture Suppor
Page 325:
Additional Resources Appendix • X
show all

Xilinx Constraints Guide

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?