National Instruments AutoCode NI MATRIX - Manual (Page 29)

Chapter 2 C Language Reference
AutoCode Reference 2-12 ni.com
Figure 2-1. Example UserCode Function File (sa_user.c)
The $ucb directive is recognized and interpreted by the automatic linking
facility of the simulator in SystemBuild to distinguish between UCBs
written for simulation purposes using SystemBuild only and UCBs written
for linking with AutoCode applications. The exact name of the UCB
function must be specified in the
$ucb directive if this UCB function is
used for simulation using SystemBuild.
The computations performed by UCBs can update both block states and
outputs. Execution of each section is controlled by flags set by the
simulator in the INFO structure. Refer to the
Implementing Handwritten
UCBs section.
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