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User Manual 3153
The Control Bits
There are four control bits that must be loaded within a group of four
words, they are: break point, trigger phase offset, SYNC and stop bits.
The control bits are downloaded one at a time with each word, and
always at D3. The order that these bits are placed within a group is
critical to the operation of the instrument therefore, use the example in
Figure 3-10 to build your data accordingly.
The bits are described below in the same order as they must be placed
in each data group..
Break Point Bit - The break point bit determines the point where the
waveform will stop immediately after a stop signal has been received. If
you placed the break point bit at point n, the actual stop occurs at point
n+2.
Break point bits can be placed in more than one location. Place the
break point at the first word of a group. When D3 = 1, the break point bit
is active. With D3 = 0, the break point bit is disabled.
Trigger Start Offset Bit – The trigger start offset bit determines the
offset point in the waveform where the waveform will start after receiving
a trigger signal. If you placed the trigger start offset bit at point n, the
actual start offset occurs at point n+3.
Trigger start offset bits can be placed in one location only. Place the
trigger start offset bit at the second word of a group. When D3 = 1, the
trigger start offset bit is active. With D3 = 0, the trigger start offset bit is
disabled.
SYNC Bit – The SYNC bit determines the offset point on the waveform
where the waveform will output a SYNC signal. The SYNC signal width
is always 4 clock cycles. If you placed the SYNC bit at point n, the actual
SYNC occurs from point n-2 to point n+1.
Multiple SYNC bits can be placed in any location along the length of the
programmed waveform. Place the SYNC bit at the third word of a group.
When D3 = 1, the SYNC bit is active. With D3 = 0, the SYNC bit is
disabled.
Stop Bit – The Stop bit determines the end point of the waveform. If you
placed the stop bit at point n, the actual stop occurs at point n+4.
Stop bit can be placed in one location only. If you place multiple stop
bits, the waveform will stop at the first stop bit that is encounters. Place
the stop bit at the fourth word of a group. When D3 = 1, the stop bit is
active. With D3 = 0, the stop bit is disabled.
Using The Instrument 3-42
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