Spartan-3 FPGA Family: DC and Switching Characteristics
DS099 (v3.1) June 27, 2013
Product Specification
71
TPHFD
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 not in use. The Input
Delay is programmed.
IOBDELAY = IFD,
without DCM
XC3S50
–0.98
–0.93
ns
XC3S200
–0.40
–0.35
ns
XC3S400
–0.27
–0.22
ns
XC3S1000
–1.19
–1.14
ns
XC3S1500
–1.43
–1.38
ns
XC3S2000
–2.33
–2.28
ns
XC3S4000
–2.47
–2.42
ns
XC3S5000
–2.66
–2.61
ns
Notes:
1.
The numbers in this table are tested using the methodology presented in
Table 48 and are based on the operating conditions set forth in
2.
This setup time requires adjustment whenever a signal standard other than LVCMOS25 is assigned to the Global Clock Input or the data
Input. If this is true of the Global Clock Input, subtract the appropriate adjustment from
Table 44. If this is true of the data Input, add the
appropriate Input adjustment from the same table.
3.
This hold time requires adjustment whenever a signal standard other than LVCMOS25 is assigned to the Global Clock Input or the data
Input. If this is true of the Global Clock Input, add the appropriate Input adjustment from
Table 44. If this is true of the data Input, subtract the
appropriate Input adjustment from the same table. When the hold time is negative, it is possible to change the data before the clock’s active
edge.
4.
DCM output jitter is included in all measurements.
Table 42: Setup and Hold Times for the IOB Input Path
Symbol
Description
Conditions
Device
Speed Grade
Units
-5
-4
Min
Setup Times
TIOPICK
Time from the setup of data at the Input pin
to the active transition at the ICLK input of
the Input Flip-Flop (IFF). No Input Delay is
programmed.
IOBDELAY = NONE
XC3S50
1.65
1.89
ns
XC3S200
1.37
1.57
ns
XC3S400
1.37
1.57
ns
XC3S1000
1.65
1.89
ns
XC3S1500
1.65
1.89
ns
XC3S2000
1.65
1.89
ns
XC3S4000
1.73
1.99
ns
XC3S5000
1.82
2.09
ns
TIOPICKD
Time from the setup of data at the Input pin
to the active transition at the IFF’s ICLK
input. The Input Delay is programmed.
IOBDELAY = IFD
XC3S50
4.39
5.04
ns
XC3S200
4.76
5.47
ns
XC3S400
4.63
5.32
ns
XC3S1000
5.02
5.76
ns
XC3S1500
5.40
6.20
ns
XC3S2000
6.68
7.68
ns
XC3S4000
7.16
8.24
ns
XC3S5000
7.33
8.42
ns
Table 41: System-Synchronous Pin-to-Pin Setup and Hold Times for the IOB Input Path (Cont’d)
Symbol
Description
Conditions
Device
Speed Grade
Units
-5
-4
Min