Virtex-6 FPGA Data Sheet: DC and Switching Characteristics
IOB Pad Input/Output/3-State Switching Characteristics
Table 44 (for commercial (XC) Virtex-6 devices) and Table 45 (for the Defense-grade (XQ) Virtex-6 devices) summarizes the
values of standard-specific data input delay adjustments, output delays terminating at pads (based on standard) and 3-state
delays.
T IOPI is described as the delay from IOB pad through the input buffer to the I-pin of an IOB pad. The delay varies depending
on the capability of the SelectIO input buffer.
T IOOP is described as the delay from the O pin to the IOB pad through the output buffer of an IOB pad. The delay varies
depending on the capability of the SelectIO output buffer.
T IOTP is described as the delay from the T pin to the IOB pad through the output buffer of an IOB pad, when 3-state is
disabled. The delay varies depending on the SelectIO capability of the output buffer.
Table 46 summarizes the value of T IOTPHZ . T IOTPHZ is described as the delay from the T pin to the IOB pad through the
output buffer of an IOB pad, when 3-state is enabled (i.e., a high impedance state).
Table 44: IOB Switching Characteristics for the Commercial (XC) Virtex-6 Devices
T IOPI
T IOOP
T IOTP
I/O Standard
Speed Grade
Speed Grade
Speed Grade
Units
-3
-2
-1
-1L
-3
-2
-1
-1L
-3
-2
-1
-1L
LVDS_25
LVDSEXT_25
HT_25
BLVDS_25
RSDS_25 (point to point)
HSTL_I
HSTL_II
HSTL_III
HSTL_I_18
HSTL_II_18
HSTL_III_18
SSTL2_I
SSTL2_II
SSTL15
LVCMOS25, Slow, 2 mA
LVCMOS25, Slow, 4 mA
LVCMOS25, Slow, 6 mA
LVCMOS25, Slow, 8 mA
LVCMOS25, Slow, 12 mA
LVCMOS25, Slow, 16 mA
LVCMOS25, Slow, 24 mA
LVCMOS25, Fast, 2 mA
LVCMOS25, Fast, 4 mA
LVCMOS25, Fast, 6 mA
LVCMOS25, Fast, 8 mA
LVCMOS25, Fast, 12 mA
LVCMOS25, Fast, 16 mA
0.85
0.85
0.85
0.85
0.85
0.81
0.81
0.81
0.81
0.81
0.81
0.81
0.81
0.81
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.94
0.94
0.94
0.94
0.94
0.91
0.91
0.91
0.91
0.91
0.91
0.91
0.91
0.91
0.57
0.57
0.57
0.57
0.57
0.57
0.57
0.57
0.57
0.57
0.57
0.57
0.57
1.09
1.09
1.09
1.09
1.09
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
0.66
0.66
0.66
0.66
0.66
0.66
0.66
0.66
0.66
0.66
0.66
0.66
0.66
1.08
1.08
1.08
1.08
1.08
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
0.70
0.70
0.70
0.70
0.70
0.70
0.70
0.70
0.70
0.70
0.70
0.70
0.70
1.45
1.53
1.51
1.39
1.45
1.45
1.44
1.42
1.47
1.50
1.42
1.49
1.42
1.42
5.09
3.30
2.62
2.21
1.80
1.89
1.68
5.12
3.28
2.56
2.11
1.74
1.77
1.54
1.65
1.62
1.50
1.54
1.56
1.56
1.54
1.58
1.62
1.54
1.60
1.54
1.54
5.46
3.49
2.81
2.41
1.95
2.05
1.82
5.49
3.50
2.73
2.33
1.88
1.92
1.68
1.84
1.78
1.67
1.68
1.73
1.74
1.71
1.75
1.81
1.71
1.77
1.72
1.71
6.01
3.79
3.08
2.72
2.17
2.29
2.02
6.04
3.82
2.99
2.65
2.08
2.13
1.62
1.73
1.69
1.65
1.62
1.71
1.72
1.69
1.72
1.78
1.69
1.74
1.71
1.69
5.63
3.65
2.95
2.59
2.10
2.21
1.98
5.62
3.65
2.88
2.53
2.03
2.08
1.45
1.53
1.51
1.39
1.45
1.45
1.44
1.42
1.47
1.50
1.42
1.49
1.42
1.42
5.09
3.30
2.62
2.21
1.80
1.89
1.68
5.12
3.28
2.56
2.11
1.74
1.77
1.54
1.65
1.62
1.50
1.54
1.56
1.56
1.54
1.58
1.62
1.54
1.60
1.54
1.54
5.46
3.49
2.81
2.41
1.95
2.05
1.82
5.49
3.50
2.73
2.33
1.88
1.92
1.68
1.84
1.78
1.67
1.68
1.73
1.74
1.71
1.75
1.81
1.71
1.77
1.72
1.71
6.01
3.79
3.08
2.72
2.17
2.29
2.02
6.04
3.82
2.99
2.65
2.08
2.13
1.62
1.73
1.69
1.65
1.62
1.71
1.72
1.69
1.72
1.78
1.69
1.74
1.71
1.69
5.63
3.65
2.95
2.59
2.10
2.21
1.98
5.62
3.65
2.88
2.53
2.03
2.08
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
DS152 (v3.6) March 18, 2014
Product Specification
28
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