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Virtex-6 FPGA Data Sheet: DC and Switching Characteristics
I/O Standard Adjustment Measurement Methodology
Input Delay Measurements
Table 47 shows the test setup parameters used for measuring input delay.
Table 47: Input Delay Measurement Methodology
Description
LVCMOS, 2.5V
LVCMOS, 1.8V
LVCMOS, 1.5V
HSTL (High-Speed Transceiver Logic),
Class I & II
HSTL, Class III
HSTL, Class I & II, 1.8V
HSTL, Class III 1.8V
SSTL (Stub Terminated Transceiver Logic),
Class I & II, 3.3V
SSTL, Class I & II, 2.5V
SSTL, Class I & II, 1.8V
LVDS (Low-Voltage Differential Signaling), 2.5V
LVDSEXT (LVDS Extended Mode), 2.5V
HT (HyperTransport), 2.5V
I/O Standard Attribute
LVCMOS25
LVCMOS18
LVCMOS15
HSTL_I, HSTL_II
HSTL_III
HSTL_I_18, HSTL_II_18
HSTL_III_18
SSTL3_I, SSTL3_II
SSTL2_I, SSTL2_II
SSTL18_I, SSTL18_II
LVDS_25
LVDSEXT_25
LDT_25
V L (1)(2)
0
0
0
V REF – 0.5
V REF – 0.5
V REF – 0.5
V REF – 0.5
V REF – 1.00
V REF – 0.75
V REF – 0.5
1.2 – 0.125
1.2 – 0.125
0.6 – 0.125
V H (1)(2)
2.5
1.8
1.5
V REF + 0.5
V REF + 0.5
V REF + 0.5
V REF + 0.5
V REF + 1.00
V REF + 0.75
V REF + 0.5
1.2 + 0.125
1.2 + 0.125
0.6 + 0.125
V MEAS
(1)(4)(5)
1.25
0.9
0.75
V REF
V REF
V REF
V REF
V REF
V REF
V REF
0 (6)
0 (6)
0 (6)
V REF
(1)(3)(5)
–
–
–
0.75
0.90
0.90
1.08
1.5
1.25
0.90
–
–
–
Notes:
1.
2.
3.
4.
5.
6.
The input delay measurement methodology parameters for LVDCI are the same for LVCMOS standards of the same voltage. Input delay
measurement methodology parameters for HSLVDCI are the same as for HSTL_II standards of the same voltage. Parameters for all other
DCI standards are the same for the corresponding non-DCI standards.
Input waveform switches between V L and V H .
Measurements are made at typical, minimum, and maximum V REF values. Reported delays reflect worst case of these measurements. V REF
values listed are typical.
Input voltage level from which measurement starts.
This is an input voltage reference that bears no relation to the V REF / V MEAS parameters found in IBIS models and/or noted in Figure 6 .
The value given is the differential input voltage.
DS152 (v3.6) March 18, 2014
Product Specification
www.xilinx.com
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