XC3SD3400A-4FGG676C Datasheet, PDF (31/101 Pages) Xilinx, Inc – Spartan-3A DSP FPGA Family Data Sheet

Spartan-3A DSP FPGA Family: DC and Switching Characteristics
Table 25: Output Timing Adjustments for IOB (Cont’d)
Convert Output Time from
LVCMOS25 with 12mA Drive
and Fast Slew Rate to the
Following Signal Standard
(IOSTANDARD)
Add the
Adjustment
Below
Speed Grade
-5
-4
Units
LVCMOS12
Slow 2 mA 7.14 7.14
ns
4 mA 4.87 4.87
ns
6 mA 5.67 5.67
ns
Fast 2 mA 6.77 6.77
ns
4 mA 5.02 5.02
ns
6 mA 4.09 4.09
ns
QuietIO 2 mA 50.76 50.76 ns
4 mA 43.17 43.17 ns
6 mA 37.31 37.31 ns
PCI33_3
0.34 0.34
ns
PCI66_3
0.34 0.34
ns
HSTL_I
0.78 0.78
ns
HSTL_III
1.16 1.16
ns
HSTL_I_18
0.35 0.35
ns
HSTL_II_18
0.30 0.30
ns
HSTL_III_18
0.47 0.47
ns
SSTL18_I
0.40 0.40
ns
SSTL18_II
0.30 0.30
ns
SSTL2_I
0.00 0.00
ns
SSTL2_II
–0.05 –0.05 ns
SSTL3_I
0.00 0.00
ns
SSTL3_II
0.17 0.17
ns
Table 25: Output Timing Adjustments for IOB (Cont’d)
Convert Output Time from
LVCMOS25 with 12mA Drive
and Fast Slew Rate to the
Following Signal Standard
(IOSTANDARD)
Add the
Adjustment
Below
Speed Grade
-5
-4
Units
Differential Standards
LVDS_25
1.16 1.16
ns
LVDS_33
0.46 0.46
ns
BLVDS_25
0.11 0.11
ns
MINI_LVDS_25
0.75 0.75
ns
MINI_LVDS_33
0.40 0.40
ns
LVPECL_25
Inputs Only
LVPECL_33
RSDS_25
1.42 1.42
ns
RSDS_33
0.58 0.58
ns
TMDS_33
0.46 0.46
ns
PPDS_25
1.07 1.07
ns
PPDS_33
0.63 0.63
ns
DIFF_HSTL_I_18
0.43 0.43
ns
DIFF_HSTL_II_18
0.41 0.41
ns
DIFF_HSTL_III_18
0.36 0.36
ns
DIFF_HSTL_I
1.01 1.01
ns
DIFF_HSTL_III
0.54 0.54
ns
DIFF_SSTL18_I
0.49 0.49
ns
DIFF_SSTL18_II
0.41 0.41
ns
DIFF_SSTL2_I
0.82 0.82
ns
DIFF_SSTL2_II
0.09 0.09
ns
DIFF_SSTL3_I
1.16 1.16
ns
DIFF_SSTL3_II
0.28 0.28
ns
Notes:
1. The numbers in this table are tested using the methodology
presented in Table 26 and are based on the operating conditions
set forth in Table 7, Table 10, and Table 12.
2. These adjustments are used to convert output- and
three-state-path times originally specified for the LVCMOS25
standard with 12 mA drive and Fast slew rate to times that
correspond to other signal standards. Do not adjust times that
measure when outputs go into a high-impedance state.
3. Note that 16 mA drive is faster than 24 mA drive for the Slow
slew rate.
DS610 (v3.0) October 4, 2010
www.xilinx.com
Product Specification
31