Input propagation times – Xilinx DS610 User Manual
Page 24
Spartan-3A DSP FPGA Family: DC and Switching Characteristics
DS610 (v3.0) October 4, 2010
Product Specification
24
Input Propagation Times
Table 21: Propagation Times for the IOB Input Path
Symbol
Description
Conditions
DELAY_VALUE
Device
Speed
Grade
Units
-5
-4
Max
Max
Propagation Times
T
IOPI
The time it takes for data to travel from
the Input pin to the I output with no input
delay programmed
LVCMOS25
IBUF_DELAY_VALUE=0
XC3SD1800A
0.51
0.53
ns
XC3SD3400A
0.73
0.93
ns
T
IOPID
The time it takes for data to travel from
the Input pin to the I output with the input
delay programmed
LVCMOS25
1
XC3SD1800A
1.29
1.62
ns
2
1.67
2.08
ns
3
1.92
2.36
ns
4
2.38
2.89
ns
5
2.61
3.17
ns
6
2.98
3.55
ns
7
3.30
3.92
ns
8
3.63
4.37
ns
9
3.31
4.02
ns
10
3.69
4.47
ns
11
3.94
4.77
ns
12
4.41
5.27
ns
13
4.67
5.56
ns
14
5.03
5.94
ns
15
5.36
6.31
ns
16
5.64
6.73
ns
1
XC3SD3400A
1.56
1.99
ns
2
1.92
2.44
ns
3
2.18
2.72
ns
4
2.66
3.19
ns
5
2.91
3.43
ns
6
3.27
3.81
ns
7
3.59
4.17
ns
8
3.87
4.58
ns
9
3.52
4.22
ns
10
3.87
4.65
ns
11
4.14
4.94
ns
12
4.68
5.40
ns
13
4.93
5.66
ns
14
5.29
6.06
ns
15
5.61
6.43
ns
16
5.88
6.80
ns