GE H
EALTHCARE
D
IRECTION
5394141, R
EVISION
5
LOGIQ™ P5 S
EVICE
M
ANUAL
5-18
Section 5-4 - Main Board Detail
5-4-3-6
POWER CONTROL BLOCK
ON/OFF power sequence control is needed to prevent system to boot up abnormally, and protect to
loose important diagnostic information of patient from unexpected power failure.
•
Live power
: Whenever main AC power is supplied, Microprocessor on the SYSCONPM(SYSCONCM) must live
always by live power supplied by APS/APS Pro Assy.
•
System boot-up sequence
Peripheral power -> LV power -> SOM (Main PC) on the SYSCONPM(SYSCONCM).
•
Software shut down sequence
Because not ATX power, Main Operation System (Windows XP) have to inform about time to shutdown
to DSP by interrupt. So DSP can allow FPGA to assert shutdown signal to MICOM.
•
Abnormal shut down sequence
SYSCONPM(SYSCONCM) can force to shutdown system abnormally by pressing power button during
15 second. But live power for MICOM has to alive.
5-4-3-7
CHACOM BLOCK
This ASIC have two main function. One is the CHAF, which have functions of coded excitation decorder
and 2nd harmonic filter. The other is COMSO, which has functions of detector, B/M mode edge
enhance, Log compression, and dynamic range control.
5-4-3-8
PGC and TEST SIGNAL GENERATION BLOCK
SYSCONPM(SYSCONCM) generate Power Gain Control signal in order to get better quality scan
image from CL1TRX. This signal goes into a preamp on the CL1TRX(BL1TRX) Assy. Additionally,
SYSCONPM(SYSCONCM) generate test signal used to test analog path of CL1TRX(BL1TRX) Assy.
These signals are converted to analog from 8bit digital data from FEBC FPGA, and DSP could update
digital PGC and Test data table whenever needed.
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