User Manual 3153
Using The Instrument 3-34
Figure 3-8, 12-Bit Waveform Data Format
Note
The Model 3153 operates in interlaced mode where four
memory cells generate one byte of data. Segment size can
be programmed in numbers evenly divisible by four only.
For example, 2096 bytes is an acceptable length for a
binary block. 2002 is not a multiple of 4, therefore the
generator will generate an error message if this segment
length is used.
Reversing Byte
Order
Binary data is sent to the Model 3153 in byte-high byte-low order. This
order can be reversed using the following command:
FORMat:BORDer {NORMal | SWAPped}
The default is NORM. This command is useful only for binary block
transfers. The query:
FORMat:BORDer?
queries the byte order configuration and returns "NORM" or "SWAP."
Using Shared
Memory
Shared memory transfer is the fastest way to get waveforms to the
Model 3153. In shared memory mode, the Model 3153's CPU
disconnects from the waveform memory and passes access to the
VXIbus. The internal data bus is connected directly to the VXIbus, and
data is downloaded into the memory in binary blocks using A24 or A32
memory space. Byte and bit order is shown in Figure 3-9. Waveform
points must be loaded in groups of 4 words. After the data is loaded into
the Model 3153, control is returned to the instrument.
In shared memory mode, the Model 3153’s memory acts like Direct
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
