QPro Virtex 2.5V QML High-Reliability FPGAs
DS002 (v1.5) December 5, 2001
www.xilinx.com
5
Preliminary Product Specification
1-800-255-7778
R
Virtex Switching Characteristics
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 Virtex devices unless otherwise noted.
IOB Input Switching Characteristics
Input delays associated with the pad are specified for
LVTTL levels. For other standards, adjust the delays with
the values shown in "IOB Input Switching Characteristics
Standard Adjustments" on page 6.
Symbol Description Device
Speed Grade
Units
-4
Min Max
Propagation Delays
T
IOPI
Pad to I output, no delay All - 1.0 ns
T
IOPID
Pad to I output, with delay XQV100 - 1.9 ns
XQV300 - 1.9 ns
XQV600 - 2.3 ns
XQV1000 - 2.7 ns
T
IOPLI
Pad to output IQ via transparent latch, no
delay
All - 2.0 ns
T
IOPLID
Pad to output IQ via transparent latch, with
delay
XQV100 - 4.8 ns
XQV300 - 5.1 ns
XQV600 - 5.5 ns
XQV1000 - 5.9 ns
Sequential Delays
T
IOCKIQ
Clock CLK to output IQ All - 0.8 ns
Setup and Hold Times with Respect to Clock CLK Setup Time / Hold Time
T
IOPICK
/ T
IOICKP
Pad, no delay All 2.0 / 0 - ns
T
IOPICKD
/ T
IOICKPD
Pad, with delay All 5.0 / 0 - ns
T
IOICECK
/ T
IOCKICE
ICE input All 1.0 / 0 - ns
T
IOSRCKI
/ T
IOCKISR
SR input (IFF, synchronous) All 1.3 / 0 - ns
Set/Reset Delays
T
IOSRIQ
SR input to IQ (asynchronous) All - 1.8 ns
T
GSRQ
GSR to output IQ All - 12.5 ns
Notes:
1. A Zero “0” Hold Time listing indicates no hold time or a negative hold time. Negative values can not be guaranteed “best-case”,
but if a “0” is listed, there is no positive hold time.