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SY87729/39L
Micrel, Inc.
parameters, and then enter them yourself along the left
side of the download application, or you could click the
“ 739ifier ” button. This launches another copy of the
calculation module. As explained above, once you ’ ve got
the desired output frequency in the calculation module, you
can select its “ Use These ” button. This will copy the
configuration parameters it had calculated into the download
module for you.
In fact, that ’ s just what was done to obtain the above
figures. Figure 16 shows the download application before
the SY87729/39L evaluation board was attached, as per
the following section. After attachment, the calculation
module was set up just like in Figure 15. After selecting the
“ Use These ” button, the download application looked just
Evaluation Board
like that in Figure 17. Note that the configuration parameters
computed and displayed in the calculation module match
those entered in the download module.
The final step is to effect the actual download. To do
this, click the “ Download ” button in the download application.
At this point, it is VERY IMPORTANT to check the contents
of the status line, which appears below the configuration
parameters. This line is updated whenever the user clicks
the “ Download ” button. If you get some message like in
Figure 16, then the configuration is incorrect, and the
download was not performed. This will not happen with
configurations sent by the calculation module, but may occur
if parameters are entered or modified manually.
Possible errors are shown in Table 2.
Error Message
QP ! = 0-31
QPM1 ! = 0-31
QP + QPM1 > 31
P ! = 17-32
PostDiv ! = 1-16, 18, 20,
22, 24, 26, 28, 30, 32, 36,
40, 44, 48, 52, 56, 60
MDIV != 15-18, 31-32
NDIV != 15-18, 31-32
MDIV, NDIV,
one is 15-18, other is 31-32
M9999-071906
hbwhelp@micrel.com or (408) 955-1690
Definition
You have entered some number greater than 31 in the “ Qp ” configuration edit
box. This parameter may only take a number between 0 and 31 inclusive.
You have entered some number greater than 31 in the “ Qp-1 ” configuration edit
box. This parameter may only take a number between 0 and 31 inclusive.
The sum of the values of the “ Qp ” and the “ Qp-1 ” configuration edit boxes must
also be some number between 0 and 31 inclusive. The download module cannot
determine which of these two parameters is in error.
You have entered some number less than 17 or greater than 32 in the “ P ”
configuration edit box. This parameter may only take on a value between 17 and
32 inclusive.
The value in the “ PostDiv ” configuration edit box may only be one of the values
listed.
You have entered some number not allowed in the “ M ” configuration edit box.
This parameter may only take on a value of 15, 16, 17, 18, 31, or 32.
You have entered some number not allowed in the “ N ” configuration edit box.
This parameter may only take on a value of 15, 16, 17, 18, 31, or 32.
The value in the “ M ” configuration edit box limits the choices available in the “ N ”
configuration edit box, and vice versa. If the “ M ” configuration edit box contains
one of 15, 16, 17, or 18, then the “ N ” configuration edit box must also contain one
of 15, 16, 17, or 18. If the “ M ” configuration edit box contains one of 31 or 32,
then the “ N ” configuration edit box must also contain one of 31 or 32.
Table 2. Possible Error Messages
8
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