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ART NUMBER FN091065, REVISION 2 VS5 N AND VS6 N SERVICE MANUAL
5-16 Section 5-3 - Front End Unit
PRELIMINARY
5-3-4 TR32 Boards (Transmitter/Receiver) (cont’d)
Each TR32 Board has 32 channels and includes a 32-channel Digital Beam Former (consisting of one
FOC32 ASIC).
Inputs are 32 probe lines that have gone through aperture selection, performed in the PSB Board.
Outputs are MLA0 and MLA1 digital buses from the Beam Former and CW output lines to the Analog
CW BF.
The MLA output bus of TR32B is connected to the MLA input bus of TR32A, giving a 64-channel BF on
the MLA output.
All required control, memory and clocks for the two TR32 Boards reside in the RFI Board.
The two TR32 Boards are linked together in parallel. The way in which they operate depends upon the
probe currently in use, and also on the current type of Transmit/Receive mode.
Transmit/Receive modes can be divided into two types, as shown in the following examples:
• CW Mode - half the channels transmit signals, and half the channels receive
signals, simultaneously.
• 2D Mode - signals are propagated between the channels; there is a specific
time delay between transmit and receive - data is then interpolated
in accordance with the delay, and the image is created.
The TR32 Boards are connected to the RFI Board by stacked connectors, as shown Figure 5-13 "TR32
Board - Stacked Connectors" on page 5-16.
Figure 5-13 TR32 Board - Stacked Connectors
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