X-Stream Operator’s Manual
WM-OM-E Rev I 429
Keywords
keyword:
//
arguments:
none
required?:
no
Notes:
1. // begins a comment. After // the rest of the line, up to line feed, is ignored.
2. // need not be followed by a space.
keyword:
AGC_GAIN
arguments:
<value, 0 to 0.125>
required?:
no
Notes:
The difference of the normalized (-1 to +1) sample value to the expected sample value is multiplied
by this to determine the change in expected level. The DDA treats positive and negative levels
separately, to handle asymmetric waveforms. The change in the 0 level is 1/4 of this, a correction to
the 0 level shifts all the levels. The DDA also allows very slow changes of relative spacing; it starts
analyzing each VCO sync field assuming symmetry and perfect spacing. In the DDA, this value is
0.12 for PR4, EPR4, and E2PR4. If this keyword is not seen, its value remains unchanged. If this
value is never set, the default is 0.12.
possible error
messages:
"AGC_GAIN must be >= 0 and <= 0.125"
keyword:
KEYWORDS_VERSION
arguments:
1
required?:
yes
possible error
messages:
"Keywords version is newer than software rev!" When the keywords file is
updated, this message will specify KEYWORDS_VERSION 2. New software will
be able to handle versions 1 and 2. Old software will produce this error message
if it encounters KEYWORDS_VERSION 2.
keyword:
LEVELS
arguments:
<number from 3 to 32>
required?:
yes
Note:
LEVELS must appear before NORMALIZED_LEVELS are specified
possible error
messages:
"#levels must be >= 3 and <= 32!"
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