R
Table 16: Propagation Times for the IOB Input Path
-4Speed
Grade
IFD_
DELAY_
VALUE
Symbol
Description
Conditions
Device
Max
Units
Propagation Times
(2)
T
The time it takes for data to
LVCMOS25
,
0
All
2.25
ns
IOPLI
travel from the Input pin through IFD_DELAY_VALUE = 0
the IFF latch to the I output with
no input delay programmed
(2)
2
3
2
5
4
XA3S100E
XA3S250E
XA3S500E
XA3S1200E
XA3S1600E
5.97
6.33
6.49
8.15
7.16
ns
ns
ns
ns
ns
T
The time it takes for data to
LVCMOS25 ,
IOPLID
travel from the Input pin through IFD_DELAY_VALUE =
the IFF latch to the I output with default software setting
the input delay programmed
Notes:
1. The numbers in this table are tested using the methodology presented in Table 19 and are based on the operating conditions set forth in
Table 6 and Table 9.
2. This propagation time requires adjustment whenever a signal standard other than LVCMOS25 is assigned to the data Input. When this is
true, add the appropriate Input adjustment from Table 17.
Table 17: Input Timing Adjustments by IOSTANDARD
Table 17: Input Timing Adjustments by IOSTANDARD
Convert Input Time from
LVCMOS25 to the Following
Signal Standard
Add the
Adjustment Below
Convert Input Time from
LVCMOS25 to the Following
Signal Standard
Add the
Adjustment Below
(IOSTANDARD)
-4 Speed Grade
Units
(IOSTANDARD)
-4 Speed Grade
Units
Single-Ended Standards
LVTTL
Differential Standards
LVDS_25
0.43
0.43
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
0.49
0.39
0.49
0.27
0.49
0.49
0.49
0.30
0.32
ns
ns
ns
ns
ns
ns
ns
ns
ns
LVCMOS33
LVCMOS25
LVCMOS18
LVCMOS15
LVCMOS12
PCI33_3
BLVDS_25
MINI_LVDS_25
LVPECL_25
0.98
0.63
0.27
0.42
0.12
0.17
0.30
0.15
RSDS_25
DIFF_HSTL_I_18
DIFF_HSTL_III_18
DIFF_SSTL18_I
DIFF_SSTL2_I
HSTL_I_18
HSTL_III_18
SSTL18_I
Notes:
1. The numbers in this table are tested using the methodology
presented in Table 19 and are based on the operating conditions
set forth in Table 6, Table 9, and Table 11.
SSTL2_I
2. These adjustments are used to convert input path times originally
specified for the LVCMOS25 standard to times that correspond to
other signal standards.
DS635 (v2.0) September 9, 2009
www.xilinx.com
Product Specification
17
XILINX [ XILINX, INC ]
