User manual

Publication No. 980935 Rev. M 3152B User Manual
Astronics Test Systems Programming Reference 5-57
Using this command, segment table data is loaded to the 3152B using binary transfer
like when downloading
wavefo
rm data using the trace command. Binary transfer allows any 8-bit byte
(including extended ASCII
code) to be transmitted in a message.
This command is particularly useful
when a large number of segments are required. As an example, the next
command
generates three segments with 12 bytes of data containing segment size information.
SEGment#212<binary_block>
This command causes the transfer of 12
bytes of data (3 segment definitions) into the segment table buffer.
The <header> is interpreted this way:
The ASCII "#" ($23) designates the start of the binary data block.
"2" designates the number of digits that follow.
"12" is the number of bytes to follow. This number must divide by 4.
The generator accepts binary data as 32
-bit integers, which are sent in two-byte words. Therefore, the total
number of bytes is always 4 times the number of segments. For example, 36 bytes are required to download
9 segments to the segment table. The IEEE
-STD-488.2 definition of Definite Length Arbitrary Block Data
format is demo
nstrated in Figure 5-1. The transfer of definite length arbitrary block data must terminate with
the EOI bit set. This way, carriage
-return (CR – 0dH) and line feed (LF – 0aH) characters can be used as
segment table data points and will not cause unexpecte
d termination of the arbitrary block data.
Figure 5
-4 shows the organization of the 32-bit word
for the segment start address and size. There are a
number of points you should be aware of before you
organize the data:
Figure 5-4, Segment Address and Size Example
1. The minimum number of segments is 1 and the maximum number of segments is 16k.
2. Maximum segment size depends on your installed option. With the basic 3152B you can program a
segment of up to 1 Meg points.
3. Segment table data has 32-bit values of which are used for segment size. Therefore, d
ata for each
segment must have 4 bytes
4. The number of bytes in a complete segment table must divide by 4. The 3152B has no control over
data sent to its segment table during data transfer. Therefore, wrong data and/or incorrect number of
bytes will cause erroneous memory partitioning.
Parameters
Name
Type
Description
<binary_block>
Binary
Block of binary data that contains information on the
segment table.