R
Virtex™-II Platform FPGAs: DC and Switching Characteristics
IOB Output Switching Characteristics
Output delays terminating at a pad are specified for LVTTL with 12 mA drive and fast slew rate. For other standards, adjust
the delays with the values shown in IOB Output Switching Characteristics Standard Adjustments, page 14.
Table 16: IOB Output Switching Characteristics
Speed Grade
Description
Propagation Delays
Symbol
–6
–5
–4
Units
1.43
1.72
1.51
1.83
1.74
2.11
O input to Pad
T
ns, Max
ns, Max
IOOP
O input to Pad via transparent latch
3-State Delays
T
IOOLP
(1)
0.51
1.38
0.56
1.45
0.64
1.67
T input to Pad high-impedance
T
ns, Max
ns, Max
IOTHZ
T input to valid data on Pad
T
IOTP
T input to Pad high-impedance via transparent
latch
0.80
0.88
1.01
T
ns, Max
IOTLPHZ
IOTLPON
(1)
1.67
4.73
1.77
5.20
2.04
5.98
T input to valid data on Pad via transparent latch
T
ns, Max
ns, Max
(1)
GTS to Pad high impedance
T
GTS
Sequential Delays
1.76
0.95
1.87
1.04
2.15
1.20
Clock CLK to Pad
T
ns, Max
ns, Max
ns, Max
IOCKP
Clock CLK to Pad high-impedance
T
IOCKHZ
IOCKON
(1)
(synchronous)
1.82
1.94
2.22
Clock CLK to valid data on Pad (synchronous)
Setup and Hold Times Before/After Clock CLK
O input
T
0.31/–0.08
0.19/–0.06
0.27/–0.05
0.28/–0.06
0.19/–0.06
0.27/–0.05
0.34/–0.09
0.21/–0.07
0.30/–0.06
0.31/–0.07
0.21/–0.07
0.30/–0.06
0.39/–0.11
0.24/–0.08
0.34/–0.07
0.35/–0.08
0.24/–0.08
0.34/–0.07
T
/T
ns, Min
ns, Min
ns, Min
ns, Min
ns, Min
ns, Min
IOOCK IOCKO
OCE input
T
T
/T
IOOCECK IOCKOCE
SR input (OFF)
/T
IOSRCKO IOCKOSR
3–State Setup Times, T input
3–State Setup Times, TCE input
3–State Setup Times, SR input (TFF)
Set/Reset Delays
T
/T
IOTCK IOCKT
T
T
/T
IOTCECK IOCKTCE
/T
IOSRCKT IOCKTSR
2.41
1.52
2.59
1.67
2.98
1.92
SR input to Pad (asynchronous)
T
ns, Max
ns, Max
IOSRP
SR input to Pad high-impedance
T
IOSRHZ
(1)
(asynchronous)
2.39
5.44
2.56
5.98
2.95
6.88
SR input to valid data on Pad (asynchronous)
GSR to Pad
T
ns, Max
ns, Max
IOSRON
T
IOGSRQ
Notes:
1. The 3-state turn-off delays should not be adjusted.
DS031-3 (v3.0) August 1, 2003
Product Specification
www.xilinx.com
1-800-255-7778
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13
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