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Functional Overview
2-20 GB1400 User Manual
Pattern Controls and Function Keys
The PATTERN section of both the Analyzer and Generator front panels contains
two basic types or groups of controls: "pattern" and "function". The four
function or "soft" keys—F1, F2, F3, and F4—have different functions depending
on the current mode of the instrument. A primary function of these controls is to
access and navigate the menu system. Pattern controls, which includes all other
controls in the PATTERN section, are used to select edit, save, and recall test
patterns.
PRBS
WORD
RECALL
SAVE
F1 F2 F3 F4
MSB
1 2 3 4 5 6 7 8
CLEAR SET
WORD
LENGTH
CLK REF
• PRBS: Press this key, and then the pattern up/down keys to select a PRBS
pattern.
• WORD: Press this key either to select a word or ROM pattern or to edit the
current word pattern.
• SAVE and RECALL: Use these keys to save and recall user-created word
patterns to and from non-volatile memory. The standard GB1400 can store
up to ten 16-bit or short word patterns. When equipped with the 1-Mbit
option, the GB1400 Generator and Analyzer can store up to ten (10) 65-kbit
patterns, depending upon the buffer size set for word memory.
• WORD LENGTH: Press this key and then the up/down keys, to adjust the
length of the current word pattern.
• (↑↑ ,↓↓ ): These are the pattern up/down keys. Their effect depends on which of
the above pattern keys has been selected.
• MSB 1 to 8: Use these keys to edit the displayed byte in the current word
pattern. Each key will toggle one bit in the displayed byte.
• CLEAR: Pressing this key forces all bits in the displayed byte to 0.
• SET: Pressing this key forces all bits in the displayed byte to 1.