R
XQ4000XL IOB Input 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.
These path delays, provided as a guideline, have been
extracted from the static timing analyzer report. All timing
parameters assume worst-case operating conditions (sup-
ply voltage and junction temperature)
.
Symbol
Description
Device
-3
-1
Units
Min
Max
Min
Max
Clocks
T
ECIK
T
OKIK
Clock enable (EC) to clock (IK)
All devices
0.1
-
0.1
-
ns
Delay from FCL enable (OK) active edge to IFF
clock (IK) active edge
All devices
2.2
-
1.6
-
ns
Setup Times
T
PICK
T
PICKF
Pad to clock (IK), no delay
All devices
1.7
-
1.3
-
ns
Pad to clock (IK), via transparent fast capture latch,
no delay
All devices
2.3
-
1.8
-
ns
T
POCK
Hold Times
Pad to fast capture latch enable (OK), no delay
All devices
1.2
-
0.9
-
ns
All Hold Times
All devices
0
-
0
-
ns
Global Set/Reset
T
MRW
T
RRI
Minimum GSR pulse width
Delay from GSR input to any Q
(2)
All devices
-
19.8
-
15.0
ns
XQ4013XL
-
15.9
-
-
ns
XQ4036XL
-
22.5
-
-
ns
XQ4062XL
-
29.1
-
-
ns
XQ4085XL
-
-
-
26.0
ns
Propagation Delays
T
PID
T
PLI
T
PFLI
Pad to I1, I2
All devices
-
1.6
-
1.7
ns
Pad to I1, I2 via transparent input latch, no delay
All devices
-
3.1
-
2.4
ns
Pad to I1, I2 via transparent FCL and input latch, no
delay
All devices
-
3.7
-
2.8
ns
T
IKRI
T
IKLI
T
OKLI
Clock (IK) to I1, I2 (flip-flop)
All devices
-
1.7
-
1.3
ns
Clock (IK) to I1, I2 (latch enable, active Low)
All devices
-
1.8
-
1.4
ns
FCL enable (OK) active edge to I1, I2
(via transparent standard input latch)
All devices
-
3.6
-
2.7
ns
Notes:
1.
2.
IFF = Input Flip-Flop or Latch, FCL = Fast Capture Latch
Indicates Minimum Amount of Time to Assure Valid Data.
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