XC3S400-4FT256C Xilinx Inc, XC3S400-4FT256C Datasheet - Page 88

• Manufacturer Part Number: XC3S400-4FT256C
• Description: SEMI CONDUCTOR
• Manufacturer: Xilinx Inc

Specifications of XC3S400-4FT256C

• Case: BGA
• Dc: 04+

Spartan-3 FPGA Family: DC and Switching Characteristics
Table 58: Switching Characteristics for the DLL (Continued)
Notes:
1.
2.
3.
4.
5.
Digital Frequency Synthesizer (DFS)
Table 59: Recommended Operating Conditions for the DFS
88
Notes:
1.
2.
3.
Lock Time
LOCK_DLL
Delay Lines
DCM_TAP
Input Frequency Ranges
F
Input Clock Jitter Tolerance
CLKIN_CYC_JITT_FX_LF
CLKIN_CYC_JITT_FX_HF
CLKIN_PER_JITT_FX
CLKIN
The numbers in this table are based on the operating conditions set forth in
DLL specifications apply when any of the DLL outputs (CLK0, CLK90, CLK180, CLK270, CLK2X, CLK2X180, or CLKDV) are in use.
Only mask revision ‘E’ and later devices (see
using the CLK2X output. For all other Spartan-3 devices, use feedback from the CLK0 output (instead of the CLK2X output) and set the
CLK_FEEDBACK attribute to 1X.
Indicates the maximum amount of output jitter that the DCM adds to the jitter on the CLKIN input.
This specification only applies if the attribute DUTY_CYCLE_CORRECTION = TRUE.
DFS specifications apply when either of the DFS outputs (CLKFX or CLKFX180) are used.
If both DFS and DLL outputs are used on the same DCM, follow the more restrictive CLKIN_FREQ_DLL specifications in
CLKIN input jitter beyond these limits may cause the DCM to lose lock.
Symbol
CLKIN_FREQ_FX
Symbol
(2)
(3)
When using the DLL alone: The
time from deassertion at the
DCM’s Reset input to the rising
transition at its LOCKED output.
When the DCM is locked, the
CLKIN and CLKFB signals are
in phase
Delay tap resolution
Description
Frequency for the CLKIN input
Cycle-to-cycle jitter at the
CLKIN input
Period jitter at the CLKIN input
Package Marking, page
Description
www.xilinx.com
18 MHz < F
30 MHz < F
40 MHz < F
50 MHz < F
Frequency Mode /
F
7) and all revisions of the XC3S50 and the XC3S1000 support DLL feedback
F
CLKIN
CLKIN
Table 31
CLKIN
CLKIN
CLKIN
CLKIN
> 60 MHz
All
Range
Frequency
Mode
< 30 MHz
< 40 MHz
< 50 MHz
< 60 MHz
High
Low
All
All
and
Table
57.
Min
Device
1
-
-
-
All
All
-5
±
±
Max
Speed Grade
280
±
300
150
30.0
Min
1
-
-
-
-
-
DS099-3 (v2.2) May 25, 2007
-5
Speed Grade
Max
2.88
2.16
1.20
0.60
0.48
60.0
Min
1
-
-
-
Product Specification
30.0
-4
Min
-
-
-
-
-
±
±
Max
280
-4
±
300
150
1
Max
2.88
2.16
1.20
0.60
0.48
60.0
Table
Units
MHz
Units
ps
ps
ns
ms
ms
ms
ms
ms
ps
57.
R