
Spartan-3 FPGA Family: DC and Switching Characteristics
DS099 (v3.1) June 27, 2013
Product Specification
70
Table 41: System-Synchronous Pin-to-Pin Setup and Hold Times for the IOB Input Path
Symbol
Description
Conditions
Device
Speed Grade
Units
-5
-4
Min
Setup Times
TPSDCM
When writing to the Input
Flip-Flop (IFF), the time from the
setup of data at the Input pin to
the active transition at a Global
Clock pin. The DCM is in use. No
Input Delay is programmed.
IOBDELAY = NONE,
XC3S50
2.37
2.71
ns
XC3S200
2.13
2.35
ns
XC3S400
2.15
2.36
ns
XC3S1000
2.58
2.95
ns
XC3S1500
2.55
2.91
ns
XC3S2000
2.59
2.96
ns
XC3S4000
2.76
3.15
ns
XC3S5000
2.69
3.08
ns
TPSFD
When writing to IFF, the time from
the setup of data at the Input pin
to an active transition at the
Global Clock pin. The DCM is not
in use. The Input Delay is
programmed.
IOBDELAY = IFD,
without DCM
XC3S50
3.00
3.46
ns
XC3S200
2.63
3.02
ns
XC3S400
2.50
2.87
ns
XC3S1000
3.50
4.03
ns
XC3S1500
3.78
4.35
ns
XC3S2000
4.98
5.73
ns
XC3S4000
5.25
6.05
ns
XC3S5000
5.37
6.18
ns
Hold Times
TPHDCM
When writing to IFF, the time from
the active transition at the Global
Clock pin to the point when data
must be held at the Input pin. The
DCM is in use. No Input Delay is
programmed.
IOBDELAY = NONE,
XC3S50
–0.45
–0.40
ns
XC3S200
–0.12
–0.05
ns
XC3S400
–0.12
–0.05
ns
XC3S1000
–0.43
–0.38
ns
XC3S1500
–0.45
–0.40
ns
XC3S2000
–0.47
–0.42
ns
XC3S4000
–0.61
–0.56
ns
XC3S5000
–0.62
–0.57
ns