4535 611 98931 iE33 Service Manual Page 102
CSIP Level 1 Theory of Operation: Data Paths
NAIM Bus
This bus transports data from the FEC to the NAIM. It has a 5-bit command bus and a 16-bit
data bus. It is time-multiplexed between TGC control, HVMux programming data, transducer
setup for certain transducers, microbeamformer scanfile download (for some transducers). The
clock rate is 40 MHz.
Motor Bus
The Motor Bus is the transmission path for multi-phase DC motor control. It includes four
high-current motor drive signals and six encoder channels. This bus is a subset of the interface to
the Motor Controller PCB connector on the FEC.
Foot Switch Interface
The foot switch interface provides a unidirectional interface to the foot switch connector
located on the Acquisition Frontplane. It is composed of six signal lines, to monitor the state of
three dual position switches. The Frontplane provides the actual user-accessible connector, ESD
protection, EMI/RFI filter and pullup devices, while the FEC provides a registered buffer for mon-
itoring by the FEC local processor.
Data Paths
Figure 4-5 is a simplified data path block diagram for 2D and M-mode. The data path in the illus-
tration is shown by thick dashed lines. Solid thin lines indicate that a connection exists but is not
used for that data path.
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