
Virtex
-E 1.8 V Extended Memory Field Programmable Gate Arrays
DS025-3 (v2.1) February 1, 2002
1-800-255-7778Module 3 of 4
17
R
Virtex-E Pin-to-Pin Input Parameter Guidelines
Testing of switching parameters is modeled after testing methods specified by MIL-M-38510/605. All devices are 100%
functionally tested. Listed below are representative values for typical pin locations and normal clock loading. Values are
expressed in nanoseconds unless otherwise noted.
Global Clock Set-Up and Hold for LVTTL Standard,
with
DLL
Global Clock Set-Up and Hold for LVTTL Standard,
without
DLL
Description
1
Symbol
Device
3
Speed Grade
2
Units
Min
4
-8
-7
-6
Input Setup and Hold Time Relative to Global Clock Input Signal
for LVTTL Standard.
For data input with different standards, adjust the setup time
delay by the values shown in
‘‘
IOB Input Switching
Characteristics Standard Adjustments
’’
on page 6
.
No Delay
T
PSDLL
/T
PHDLL
XCV405E
1.5 /
–
0.4
1.5 /
–
0.4
1.6 /
–
0.4
1.7 /
–
0.4
ns
Global Clock and IFF, with DLL
XCV812E
1.5 /
–
0.4
1.5 /
–
0.4
1.6 /
–
0.4
1.7 /
–
0.4
ns
Notes:
1.
2.
IFF = Input Flip-Flop or Latch
Setup time is measured relative to the Global Clock input signal with the fastest route and the lightest load. Hold time is measured
relative to the Global Clock input signal with the slowest route and heaviest load.
DLL output jitter is already included in the timing calculation.
The numbers for Min are
Advance
product specification numbers.
3.
4.
Description
1
Symbol
Device
3
Speed Grade
2
Units
Min
4
-8
-7
-6
Input Setup and Hold Time Relative to Global Clock Input Signal
for LVTTL Standard.
For data input with different standards, adjust the setup time delay
by the values shown in
‘‘
IOB Input Switching Characteristics
Standard Adjustments
’’
on page 6
.
Full Delay
T
PSFD
/T
PHFD
XCV405E
2.3 / 0
2.3 / 0
2.3 / 0
2.3 / 0
ns
Global Clock and IFF, without DLL
XCV812E
2.5 / 0
2.5 / 0
2.5 / 0
2.5 / 0
ns
Notes:
1.
2.
IFF = Input Flip-Flop or Latch
Setup time is measured relative to the Global Clock input signal with the fastest route and the lightest load. Hold time is measured
relative to the Global Clock input signal with the slowest route and heaviest load.
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.
The numbers for Min are
Advance
product specification numbers.
3.
4.