XCS40 Datasheet, PDF (44/82 Pages) Xilinx, Inc – Spartan and Spartan-XL Families Field Programmable Gate Arrays

Spartan and Spartan-XL Families Field Programmable Gate Arrays
R
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.
Symbol
Description
Clocks
T_CH Clock High time
T_CL Clock Low time
Combinatorial Delays
T_ILO F/G inputs to X/Y outputs
T_IHO F/G inputs via H to X/Y outputs
T_HH1O C inputs via H1 via H to X/Y outputs
CLB Fast Carry Logic
T_OPCY Operand inputs (F1, F2, G1, G4) to C_OUT
T_ASCY Add/Subtract input (F3) to C_OUT
T_INCY Initialization inputs (F1, F3) to C_OUT
T_SUM C_IN through function generators to X/Y outputs
T_BYP C_IN to C_OUT, bypass function generators
Sequential Delays
T_CKO Clock K to Flip-Flop outputs Q
Setup Time before Clock K
T_ICK F/G inputs
T_IHCK F/G inputs via H
T_HH1CK C inputs via H1 through H
T_DICK C inputs via DIN
T_ECCK C inputs via EC
T_RCK C inputs via S/R, going Low (inactive)
Hold Time after Clock K
All Hold times, all devices
Set/Reset Direct
T_RPW Width (High)
T_RIO Delay from C inputs via S/R, going High to Q
Global Set/Reset
T_MRW
T_MRQ
F_TOG
Minimum GSR pulse width
Delay from GSR input to any Q
Toggle Frequency (MHz)
(for export control purposes)
Speed Grade
-4
-3
Min
Max
Min
Max
3.0
-
4.0
-
3.0
-
4.0
-
-
1.2
-
1.6
-
2.0
-
2.7
-
1.7
-
2.2
-
1.7
-
2.1
-
2.8
-
3.7
-
1.2
-
1.4
-
2.0
-
2.6
-
0.5
-
0.6
-
2.1
-
2.8
1.8
-
2.4
-
2.9
-
3.9
-
2.3
-
3.3
-
1.3
-
2.0
-
2.0
-
2.6
-
2.5
-
4.0
-
0.0
-
0.0
-
3.0
-
4.0
-
-
3.0
-
4.0
11.5
-
13.5
-
See page 50 for T_RRI values per device.
-
166
-
125
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
44
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DS060 (v1.6) September 19, 2001
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