Agilent Technologies 93000 SOC Series Training Manual page 297

10-10 Vector Generation
Agilent 93000 SOC Series User Training Part 1, October 2004
N O T E
ASCII device cycles are not the high level counterparts of the device
cycles that are defined in the wavetable. The latter are sequences
(possibly of length 1) of waveforms that are defined for one pin. An
ASCII device cycle contains signal definitions for all pins, and it does
not define tester waveform sequences.
The ASCII Timing File
The ASCII timing file defines the meaning of the state characters.
Every such definition is specified for a combination of state character,
pin, and ASCII device cycle. The definition is a sequence of fixed
actions each of which is associated with a delay; such a pair of action
and delay is called an event. Furthermore, every ASCII device cycle
defines a DUT cycle length, which applies to all pins and determines
the time frame of the actions associated with one state character; this
value will be referred to as an ASCII period. The following figure shows
an example block from an ASCII timing file:
Figure 190 Example Block of an ASCII Timing File
The figure shows the state character definitions for the combinations
of the pins Q0, Q1 with the ASCII device cycle std; both these combina-
tions contain the same state character definitions. The name of the
ASCII device cycle is specified after the keyword DVC. The period
keyword defines the ASCII period.
There are four state character definitions, for characters L,H, X, Z; each
of the first three definitions consists of two events, and the fourth
consists of one. The fixed actions (WL,WH,WC, and Z) are defined in
the same syntax as in the wavetable. The delays for the individual
actions are specified behind the colon.
N O T E The state characters can be selected arbitrarily (with certain restric-
tions). They will not appear in the generated setup except for possibly
occurring in the device cycle names within the wavetable.
Vector and Pattern Management
297