Filter
Top Products
Reference
3-8 GB1400 User Manual
When done, exit the EDIT Menu by pressing either F4 to lock in these
changes or F1 to "escape" without making any setup changes.
7. You now may want to access the ORDER and Pattern Sync Menus by
pressing F1 (MORE). The ORDER Menu determines the bit
transmission/analysis order of each byte in the pattern, that is MSB or LSB
first. The Pattern Sync Menu determines the byte location of the pattern sync
pulse in long WORD patterns. When done with these Menus, press the F1
key until the normal display format appears.
You have now created a new WORD pattern and may use it to perform tests. As
noted earlier, the current pattern is automatically stored in battery-backed
memory. However if the new pattern is important, be sure to save it before
creating or recalling another pattern.
Creating Word Patterns Under Remote Control
The third way to create WORD patterns is by remote control.
There are two sets of WORD editing commands: "WORD" and "byte". Word
commands, also known as "short WORD" commands, are part of the standard
command set and are used to perform 8 and 16 bit editing functions.
Byte or "long-WORD" commands, which are added to the GB1400 Generator or
Analyzer command as part of the 1-Mbit Option, are used to perform editing
functions on WORDs of any allowed length up to 16384 bytes. Note that most
WORD commands will function normally in instruments equipped with the 1-
Mbit Option.
This allows instruments equipped with the 1-Mbit Option to operate in automated
test applications designed around the 8/16-bit WORD command set. However
only byte commands may be used to edit long WORD patterns—that is WORDs
that are more than 16 bits long. Therefore a GB1400 Generator or Analyzer must
be equipped with the 1-Mbit Option to function in automated test applications
designed around the byte command set.
A general discussion of GB1400 remote control functions and an explanation of
each remote command may be found in the Appendix. In addition, the general
procedure for using byte commands to create and edit WORD patterns is given
below:
1. All long-WORD editing procedures must start with an EDIT_BEGIN
command, which may have an argument from -1 to +9. An argument of -1
tells the instrument to copy the current WORD pattern into "scratchpad"
memory, while arguments of 0 through 9 tell the instrument to copy the
indicated saved WORD pattern into scratchpad memory.
2. The core of a long-WORD editing procedure is constructed from byte
commands such as BYTE_BLOCK, BYTE_FILL, BYTE_INSERT,
BYTE_EDIT, and BYTE_DELETE. These commands may be used to
download a new pattern into scratchpad memory, or to modify a pattern
previously copied or downloaded into scratchpad memory.
3. All long-WORD (byte) editing procedures must end with an EDIT_END
command. This command may have an argument from -2 to +9. An