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GE H
EALTHCARE
D
FL091021, R
IRECTION
5-3-4
RFI Board
The RFI Board combines the following functionalities:
•
Front End Control
•
Radio Frequency & Tissue Processing
•
PCI Bus Interface
5-3-4-1
Tasks Performed by the RFI Board
•
System Master Clock generator
•
Transmitter Control
•
ATGC Control
•
Receive Focusing Control
•
Analog Test Signal Generator
•
Tx voltage Enable/Disable
•
Probe Sensing
•
Control of TR32 and P&M Boards
•
Ultrasound data acquisition and processing
5-3-4-2
Watchdog and Power ON Reset
For safety reasons, a HW watchdog stops ultrasound transmit and resets the DSP if the DSP stops
toggling the watchdog inputs.
Once enabled, it is not possible to disable the watchdog unless the board is reset, or power is cycled.
5-3-4-3
Boot-up of DSP and Firmware
When the power is turned ON, the DSP is reset, and all FPGAs are blank. The DSP is connected to PCI
directly, and can only boot up with help from the Host.
5
EVISION
Figure 5-8 RFI Block Diagram
Chapter 5 - Components and Function (Theory)
V
S
M
IVID I N
ERVICE
ANUAL
5-9
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