XC3S50A Xilinx Corp., XC3S50A Datasheet - Page 25

• Manufacturer Part Number: XC3S50A
• Description: Spartan-3a Fpga Family Data Sheet
• Manufacturer: Xilinx Corp.

Input Setup and Hold Times
Table 20: Setup and Hold Times for the IOB Input Path
DS529-3 (v1.5) July 10, 2007
Product Specification
Notes:
1.
2.
3.
Setup Times
T
T
Hold Times
T
T
Set/Reset Pulse Width
T
IOPICK
IOPICKD
IOICKP
IOICKPD
RPW_IOB
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.
and
R
Time from the setup of data at the
Input pin to the active transition at the
ICLK input of the Input Flip-Flop (IFF).
No Input Delay is programmed.
Time from the setup of data at the
Input pin to the active transition at the
ICLK input of the Input Flip-Flop (IFF).
The Input Delay is programmed.
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. No Input Delay is
programmed.
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
Table
Table
22.
22. When the hold time is negative, it is possible to change the data before the clock’s active
LVCMOS25
LVCMOS25
LVCMOS25
LVCMOS25
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Conditions
(2
(2)
(2)
(2)
Table 26
and are based on the operating conditions set forth in
DELAY_
VALUE
IFD_
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
DC and Switching Characteristics
Device
All
All
All
All
All
–1.04
–1.85
–2.59
–3.01
–3.37
–3.38
–3.77
–4.09
–4.45
1.24
1.98
2.93
3.73
4.28
4.11
5.04
5.87
6.42
1.33
Min
Speed Grade
-5
–1.03
–1.85
–2.59
–2.99
–3.34
–3.34
–3.69
–4.00
–4.28
1.91
2.36
3.10
3.98
4.57
4.40
5.45
6.36
6.99
1.61
Min
-4
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
25