XC4VFX20 XILINX [Xilinx, Inc], XC4VFX20 Datasheet - Page 23

• Manufacturer Part Number: XC4VFX20
• Description: DC and Switching Characteristics
• Manufacturer: XILINX [Xilinx, Inc]

I/O Standard Adjustment Measurement Methodology
Input Delay Measurements
Table 30
Table 30: Input Delay Measurement Methodology
DS302 (v3.2) April 10, 2008
Product Specification
Notes:
1.
2.
3.
4.
5.
LVTTL (Low-Voltage Transistor-Transistor Logic)
LVCMOS (Low-Voltage CMOS), 3.3V
LVCMOS, 2.5V
LVCMOS, 1.8V
LVCMOS, 1.5V
PCI (Peripheral Component Interface),
33 MHz, 3.3V
PCI, 66 MHz, 3.3V
PCI-X, 133 MHz, 3.3V
GTL (Gunning Transceiver Logic)
GTL Plus
HSTL (High-Speed Transceiver Logic),
Class I & II
HSTL, Class III & IV
HSTL, Class I & II, 1.8V
HSTL, Class III & IV, 1.8V
SSTL (Stub Terminated Transceiver Logic),
Class I & II, 3.3V
SSTL, Class I & II, 2.5V
SSTL, Class I & II, 1.8V
AGP-2X/AGP (Accelerated Graphics Port)
LVDS (Low-Voltage Differential Signaling), 2.5V
LVDSEXT (LVDS Extended Mode), 2.5V
ULVDS (Ultra LVDS), 2.5V
LDT (HyperTransport), 2.5V
Input delay measurement methodology parameters for LVDCI and HSLVDCI are the same as for LVCMOS standards of the same voltage.
Parameters for all other DCI standards are the same as for the corresponding non-DCI standards.
Input waveform switches between V
Measurements are made at typical, minimum, and maximum V
listed are typical.
Input voltage level from which measurement starts.
This is an input voltage reference that bears no relation to the V
shows the test setup parameters used for measuring input delay.
R
Description
L
and V
H
.
LVTTL
LVCMOS33
LVCMOS25
LVCMOS18
LVCMOS15
PCI33_3
PCI66_3
PCIX
GTL
GTLP
HSTL_I, HSTL_II
HSTL_III, HSTL_IV
HSTL_I_18, HSTL_II_18
HSTL_III_18,
HSTL_IV_18
SSTL3_I, SSTL3_II
SSTL2_I, SSTL2_II
SSTL18_I, SSTL18_II
AGP
LVDS_25
LVDSEXT_25
ULVDS_25
LDT_25
www.xilinx.com
REF
I
REF
/O Standard
Virtex-4 FPGA Data Sheet: DC and Switching Characteristics
Attribute
values. Reported delays reflect worst case of these measurements. V
/ V
MEAS
parameters found in IBIS models and/or noted in
V
V
(0.2 xV
1.2 – 0.125
1.2 – 0.125
0.6 – 0.125
0.6 – 0.125
V
V
V
V
V
V
V
REF
REF
REF
REF
REF
REF
REF
REF
REF
V
V
L
REF
0
0
0
(1,2)
0
0
– 1.00
– 0.75
– 0.2
– 0.2
– 0.5
– 0.5
– 0.5
– 0.5
– 0.5
CCO
Per PCI-X Specification
–
Per PCI Specification
Per PCI Specification
)
V
V
(0.2 xV
1.2 + 0.125
1.2 + 0.125
0.6 + 0.125
0.6 + 0.125
V
V
V
V
V
V
V
REF
REF
REF
REF
REF
REF
REF
REF
REF
V
V
H
REF
3.0
3.3
2.5
1.8
1.5
(1,2)
+ 1.00
+ 0.75
+ 0.2
+ 0.2
+ 0.5
+ 0.5
+ 0.5
+ 0.5
+ 0.5
CCO
+
)
V
Figure
(1,4,5)
V
V
V
V
V
V
V
V
V
V
1.25
0.75
MEAS
1.65
1.4
1.2
1.2
0.6
0.6
0.9
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
4.
REF
V
(1,3,5)
Spec
AGP
0.80
0.75
0.90
0.90
1.08
1.25
0.90
1.0
1.5
values
REF
–
–
–
–
–
–
–
–
23