R
Spartan and Spartan-XL Families Field Programmable Gate Arrays
Spartan CLB Switching Characteristic Guidelines
Testing of switching parameters is modeled after testing
methods specified by MIL-M-38510/605. All devices are
100% functionally tested. Internal timing parameters are
derived from measuring internal test patterns. Listed below
are representative values. For more specific, more precise,
and worst-case guaranteed data, use the values reported
by the static timing analyzer (TRCE in the Xilinx Develop-
ment System) and back-annotated to the simulation netlist.
All timing parameters assume worst-case operating condi-
tions (supply voltage and junction temperature). Values
apply to all Spartan devices and expressed in nanoseconds
unless otherwise noted.
Speed Grade
-4
-3
Description
Symbol
Min
Max
Min
Max
Units
Clocks
T
Clock High time
Clock Low time
3.0
3.0
-
-
4.0
4.0
-
-
ns
ns
CH
T
CL
Combinatorial Delays
T
F/G inputs to X/Y outputs
-
-
-
1.2
2.0
1.7
-
-
-
1.6
2.7
2.2
ns
ns
ns
ILO
T
F/G inputs via H to X/Y outputs
C inputs via H1 via H to X/Y outputs
IHO
T
HH1O
CLB Fast Carry Logic
Operand inputs (F1, F2, G1, G4) to C
T
-
-
-
-
-
1.7
2.8
1.2
2.0
0.5
-
-
-
-
-
2.1
3.7
1.4
2.6
0.6
ns
ns
ns
ns
ns
OPCY
OUT
T
Add/Subtract input (F3) to C
OUT
ASCY
T
Initialization inputs (F1, F3) to C
OUT
INCY
T
C
C
through function generators to X/Y outputs
SUM
IN
T
to C
, bypass function generators
OUT
BYP
IN
Sequential Delays
Clock K to Flip-Flop outputs Q
Setup Time before Clock K
T
-
2.1
-
2.8
ns
CKO
T
F/G inputs
1.8
2.9
2.3
1.3
2.0
2.5
-
-
-
-
-
-
2.4
3.9
3.3
2.0
2.6
4.0
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
ICK
T
F/G inputs via H
IHCK
T
C inputs via H1 through H
C inputs via DIN
HH1CK
T
DICK
T
C inputs via EC
ECCK
T
C inputs via S/R, going Low (inactive)
RCK
Hold Time after Clock K
All Hold times, all devices
Set/Reset Direct
0.0
-
0.0
-
ns
T
Width (High)
3.0
-
-
4.0
-
-
ns
ns
RPW
T
Delay from C inputs via S/R, going High to Q
3.0
4.0
RIO
Global Set/Reset
T
Minimum GSR pulse width
11.5
-
13.5
-
ns
MRW
T
Delay from GSR input to any Q
See page 50 for T
values per device.
RRI
MRQ
F
Toggle Frequency (MHz)
-
166
-
125
MHz
TOG
(for export control purposes)
44
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DS060 (v1.6) September 19, 2001
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Product Specification
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