120
Z31980_00_03
Pulse Programming
with the definitions
“d13=p1”
“d31=p3”
“d36=p16”
To calculate the right timing for p3 on channel f2, e.g., the Avance pulse programmer
must evaluate all pulses on channel f1 as well in addition to all delays. On the right-
handed side, the parallel structure of the Fourier pulse program is shown. Both channels
are completely independent of each other. The only synchronization is done at the
beginning of the sequence. In order to achieve synchronicity throughout the complete
sequence, the operator has to take care of the timing on both channels. E.g., a pulse on
only one channel must be compensated by a delay of identical length in the other chan-
nel. As mentioned before, TopSpin still compiles the corresponding Avance style pulse
program in order to generate all parameters correctly. As can be seen in the example
above, additional delays are necessary for the synchronization of the Fourier pulse pro-
gram channels. They appear as calculations in the TopSpin pulse programs.
In the pulse program text file, the complete code for the first channel is followed by that
of the second one.
8.3 Syntax and Examples
The XML format used tags to assign code to a special function. There is always an
opening and a closing tag. The code seems to be a bit complicated because all informa-
tion for a pulse, gradient pulse or delay is completely defined.
Delays:
<DELAY>
<Duration>
Avance Fourier
All channels Channel f1 Channel f12
d1 d1 d1
p1 ph1 p1 ph1 d31
d6 d6 d6
p3:f2 ph3 d31 p3 ph3
d0 d0 d0
p16:gp1 d36 p16:gp1
d16 d16 d16
p2 ph2 p2 ph2 d12
... .... ....
.. .. ..
Table 8.1 Structure of Pulse Programs
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