4535 611 98931 iE33 Service Manual Page 92
CSIP Level 1 Theory of Operation: Physical Structure
• Interface between FEC and the Scanhead Select
• Regulates the front-end pulser voltages
• Contains Matrix transducer functions including data interface for microbeamformer, HV
MUX (transmit power) control, and TGC control
Motor Controller Circuit Description
Motor-controlled transducers are calibrated when they are connected to the system. This veri-
fies to the system the transducer range of motion and sets the position counter to the home
state or that of an end-point. Once calibrated, the Motor Controller is available for position or
velocity control.
The Motor Controller can be used for constant velocity acquisition or stepped acquisition. Dur-
ing constant velocity moves, the Motor Controller is programmed via the FEC with a motion
profile consisting of a speed and range over which the speed should be maintained. While this is
happening, the Krusty ASIC on the FEC is set up by the system with look-up tables to fire a
sequence. Once set up, the Krusty ASIC notifies the Motor Controller to start the transducer
motor. When the transducer motor comes up to speed, the Krusty ASIC is notified that it may
shoot frames and retrieve valid data from the Motor Controller.
During stepped acquisition, the desired sweep rate is too slow for a constant velocity control. At
predefined thresholds, when the motor is stalled, the system calculates and initiates a series of
stepped movements. The FEC sets up the motion profile as with the constant velocity control
(only with a string of positions) and the Krusty ASIC initiates the motion. Once the desired posi-
tion is achieved, the Krusty ASIC shoots a frame and signal for the Motor Controller to move to
the next position.
A second type of stepped acquisition occurs when the transducer is moved to a location and
fires a set of 2D frames. (Essentially, the transducer is being used as a directional 2D probe.)
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