GE Voluson P8 BT16 Basic Service Manual page 220

GE RAFT
DIRECTION 5723243, R
5-2-3 Data Flow Control Description
This section describes the functions of the boards vs. different operation modes.
• DBM64 - Beamformer Motherboard
• DRFM - Mid-Processor, System Control and DMA Controlle
5-2-3-1 B-Mode
1.) DRFM
The DRFM contains the Clock-Management and PRF-Generator.
It generates(drives) BF (=Beamformer)-FPGA-Clock (200MHz) and Shot-Trigger for the
Beamformer board (DBM64).
Configures PIR (Probe Interface board) and Beamformer (DBM64 with Tx-Frequency, Tx-Focus,
Rx-Focus, LineNo (lateral Position), Tx- Apodization, RX-Apodization, Multibeam, etc. The DRFM
board also contains the Tx-Power-Reference-DAC.
Furthermore it contains Multibeam-DeInterleave, Subtraction Filter (for HI-Mode, see:
3-1-1 "Special B-Mode Techniques" on page
Demodulator), LowPassFilter, Decimation (Pixel rate Conversion), Magnitude Calculator (Part of
Demodulator), Logarithmic Amplifier, Re-Sample, Edge Enhance (Contrast Enhancement through
differentiation), Frame Filter, Blending (adapting Brightness in order to perfectly combine Nearfield-
Frame with Farfield-Frame in FFC-Mode, see:
page
Multibeam-DeInterleave means: Incoming Pixel order
shot1pix1-shot2pix1-shot3pix1-shot4pix1 -
shot1pix2-shot2pix2-shot3pix2-shot4pix2...
is converted to the new order:
shot1pix1-shot1pix2-shot1pix3..... - shot2pix1-shot2pix2-shot2pix3.....
After DC-cancelling the signal is mixed with RX-Frequency and brought to LF-Spectrum, where the
LowPassFilter cuts HF. Mixer and Magnitude-Calculator arrange Complex Demodulation, and
Logarithmic Amplifier arrange the conversion from High-Dynamic LinearSignal to the Low-
Dynamik(e.g.8Bit) Log-Signal. Several Postprocessing steps (LineFilter, FrameFilter, ReSample,
Edge Enhance) enable smooth image quality while keeping contrast high.
a.) Direct Memory Access (DMA) section
2.) DBM64 (Voluson™ P8 / Voluson™ P6)
This Beamformer board consists of Bemaformer-FPGA, TX-pulser, RX-AFE. DBM64 supports 64
TX/RX channels. Beamformer-FPGA generates TX-Frequency through dividing 200MHz by
2,3,4,5,..., TX-Focus, and Sampling Clocks for the ADC, and manages RX-Foxcus (Delay and
Chain-Adder) and Apodization.
5-12
6 DRAFT (M
EVISION
5-13.
B-mode-Data from DRFM is written via Signal Processor (SP) Channel 0 into SDRAM Fifo
Buffer memory. DMA Controller 0 transfers the data into PC main memory where scan
conversion is performed per software.
Cine Mode: Reserved area in PC main memory is used.
Section 5-2 - General Information
23, 2018)
AY
5-13, DigitalTGC, DC-Canceler, Mixer (Part of
Section 5-2-3-1-1 "Special B-Mode Techniques" on
V ™ P8 / V
OLUSON OLUSON
B S M
ASIC ERVICE
Section 5-2-
™ P6
ANUAL