xc3s1400an Xilinx Corp., xc3s1400an Datasheet - Page 27

• Manufacturer Part Number: xc3s1400an
• Description: Spartan-3an Fpga Family Data Sheet
• Manufacturer: Xilinx Corp.

Table 21: Setup and Hold Times for the IOB Input Path
Table 22: Sample Window (Source Synchronous)
DS557-3 (v3.1) June 2, 2008
Product Specification
Notes:
1.
2.
3.
T
Set/Reset Pulse Width
T
T
Symbol
IOICKPD
RPW_IOB
SAMP
Symbol
The numbers in this table are tested using the methodology presented in
Table 8
This setup time requires adjustment whenever a signal standard other than LVCMOS25 is assigned to the data Input. If this is true, add the
appropriate Input adjustment from
These hold times require adjustment whenever a signal standard other than LVCMOS25 is assigned to the data Input. If this is true, subtract
the appropriate Input adjustment from
edge.
Setup and hold
capture window of
an IOB flip-flop.
and
R
Description
Time from the active transition at the
ICLK input of the Input Flip-Flop (IFF)
to the point where data must be held
at the Input pin. The Input Delay is
programmed.
Minimum pulse width to SR control
input on IOB
Table
11.
Description
The input capture sample window value is highly specific to a particular application, device,
package, I/O standard, I/O placement, DCM usage, and clock buffer. Please consult the
appropriate Xilinx Answer Record for application-specific values.
• Answer Record
Table
Table
24.
24. When the hold time is negative, it is possible to change the data before the clock’s active
30879
LVCMOS25
-
Conditions
www.xilinx.com
(Continued)
(2)
Table 28
Max
DELAY_
VALUE
IFD_
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
-
and are based on the operating conditions set forth in
XC3S400AN
XC3S700AN
XC3S1400AN
Device
All
DC and Switching Characteristics
–1.12
–1.70
–2.08
–2.38
–2.23
–2.69
–3.08
–3.35
–1.67
–2.27
–2.59
–2.92
–2.89
–3.22
–3.52
–3.81
–1.60
–2.06
–2.46
–2.86
–2.88
–3.24
–3.55
–3.89
1.33
Min
Speed Grade
-5
–1.67
–1.12
–1.70
–2.08
–2.38
–2.23
–2.69
–3.08
–3.35
–2.27
–2.59
–2.92
–2.89
–3.22
–3.52
–3.81
–1.60
–2.06
–2.46
–2.86
–2.88
–3.24
–3.55
–3.89
1.61
Min
-4
Units
Units
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
ps
27