11274-001 AMI Semiconductor, Inc., 11274-001 Datasheet - Page 28

• Manufacturer Part Number: 11274-001
• Description: Logic and Timing, Programmable Line Lock Clock Generator IC, Tape and Reel
• Manufacturer: AMI Semiconductor, Inc.

FS6131-01
FS6131-01
FS6131-01
FS6131-01
Programmable Line Lock Clock Generator IC
Programmable Line Lock Clock Generator IC
Programmable Line Lock Clock Generator IC
Programmable Line Lock Clock Generator IC
10.4.3
Selecting the Line-Locked/Genlock option in the Device
Mode block changes the program default settings. The
Reference Source changes to the REF Pin input, and a
block appears to permit entry of the REF input frequency
in MHz. A Desired Multiple block allows entry of the ref-
erence frequency multiplying factor used to generate the
output frequency.
Exercise: Change the Ref Pin Frequency to 0.0315MHz,
and alter the Desired Multiple to 800. Change the Loop
Filter block to external, but leave the values for C1 and R
alone.
Click on Calculate Solutions. The program takes into
account all of the current screen settings and calculates
all possible combinations of Reference, Feedback, and
Post Divider values that will generate an output frequency
from the input frequency (31.5kHz) multiplied by the de-
sired multiple of 800.
A box will appear: “No solutions were found! Do you want
to retry calculations with the Check Loop Stability option
turned off?” Choose Yes.
Another box will momentarily appear: “Calculating Solu-
tions: Press cancel to stop with the solutions calculated
so far.” A number in the box will increment for every
unique solution that is found. This example will create
eight unique solutions, which are then displayed in a win-
dow in the lower right portion of the program screen.
For best results, try to keep the PostDiv value multiplied
by the FbkDiv value from getting larger than 5000 while
running the VCO as much above 70MHz as possible. If a
tradeoff must be made, it is better to run the VCO faster
and allow the divider values to get large. Solution #4 pro-
vides a PostDiv value of 800 and a FbkDiv value of 4 for
a combined value of 3200. The VCO is running at about
100MHz.
Click on Solution #4 to highlight the row, then click on
Suggest in the Loop Filter box to have the program
choose loop filter values. Suggested values for an exter-
nal loop filter are 4700pF and 47k .
Now reselect the Check Loop Stability box to turn this
feature on. Clicking on Calculate Solutions regenerates
the same solutions provided earlier, only this time the
new Loop Filter values were used.
Example: Line Locked Mode
28
Figure 22: Line-Locked Screen
Clicking on Solution #4 highlights the row, and clicking on
Disp/Save Register Values provides a window with the
final values of key settings. A click on OK then displays a
second window containing register information per the
Register Map. If the solutions are to be saved to a file,
two formats are available: a text format for viewing and a
data format for loading into the FS6131.
Clicking on Load Solution into Hardware (if enabled)
sends the information in an I
the parallel port. Note that this option is disabled for the
Windows NT operating system.
If your operating system can support parallel port com-
munication but the connection cable is not attached, an
error message is displayed: "The FS6131 Hardware was
not detected! "Make sure that it is connected to the LPT#
printer port and that it is properly connected to a +5Volt
power supply."
Table 23: Cable Interface
Green
Brown
Color
White
Black
Blue
Red
J1
1
2
3
4
5
6
2
C format to the FS6131 via
DB25
2, 13
3, 12
25
8
5
4
Signal
ADDR
GND
SDA
SCL
-
-