Wait-For-Condition Specifications - Agilent Technologies VXI 75000 C Series Hardware Manual

E1450 "Q" Inputs (setup)
E1453 "Q" Inputs (setup)

Wait-for-condition Specifications

Function: The E1450 contains four Expression Evaluators which continually evaluate user-defined
Boolean expressions whose variables are the states of the ten "Q" input lines. One evaluator, named
"CONDition3", produces the trigger qualifier (see TRIGGER SPECIFICATIONS above); the other
three, named "CONDition0", "CONDition1 ", and "CONDition2", are available for general
synchronization and handshaking. The E1450's Timing Generators can be programmed to test any
combination (including none) of CONDition0 through CONDition2 at the end of any Subcycle of any
Timing Cycle. If any of the tested Conditions is false, the system enters the Waiting-for-Condition state
and the Timing Generators stop. Operation resumes once all tested conditions become true.
Accepted Expression Elements (firmware)
Variables: "Q0", "Q1", ..., and "Q9", corresponding to the ten "Q" inputs
Operators: "AND", "OR", "EXOR", and "NOT"
Constants: "T" (for True) and "F" (for False)
Parentheses: "(" and ")" to bound expressions and indicate evaluation order
" Q" Input Levels And Loading
E1450 Module Inputs
High:> 2.0V (internal pull-up)
Low: < 0.8V at < 250
Capacitance: < 10pF, typical
E1453 Pod Inputs
High:> 2.0V (internal pull-up)
Low: < 0.8V at < 150
Capacitance: < 10pF, typical
" Q" Input Timing: The following definitions apply to a Condition which is tested in a certain Subcycle:
Setup time is how long the "Q" lines (at the specified input) must satisfy the condition before the end of
that Subcycle (as observed at the specified control output). Hold time is how long the condition must
remain satisfied after that Subcycle. If the system is in the Waiting-for-Condition state, latency time is
how long it takes to resume operation once all Conditions are satisfied. Latency time consists of a fixed
delay which varies from unit to unit plus 6.3ns non-cumulative jitter.
Without Pod (E1450 "Q" Inputs and Control Outputs)
Setup: 89ns
Hold: -71ns
Latency: 72ns to 88ns
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VXI TTL VXI ECL
3ns 7ns
(hold) 9ns 3ns
20ns 24ns
(hold) -3ns -9ns
µ
A
µ
A
Trigger Source
Front Panel TTL Front Panel ECL
6ns 8ns
4ns 2ns
24ns 25ns
-8ns -10ns
Agilent E1450 Specifications A-5
Pod TTL
n/a
n/a
12ns
2ns