Service Manual SC 7000 and SC 9000XL Patient Monitors
14 Siemens Medical Systems, EM-PCS, Danvers ASK-T898-03-7600
NOT A CONTROLLED DOCUMENT
7k9kXLTM.c2.CD_ROM.fm/04-99/kaupp
3.3 Video Output
The Graphics Subsystem provides output to an internal flat panel display,
while simultaneously providing the same output for a remote analog
display. The remote display signals are available on the docking station
connector and can drive a standard VGA monitor. The CRT interface uses
three 8 bit DACs for its three color outputs. The front bezel interface is
digital and contains 6 bits for each color.
Figure 2-5 DSP Subsystem
4 DSP Subsystem
The monitor uses a DSP for preprocessing of oversampled data (see
Figure 2-5). The DSP is a specialized microprocessor that executes high
speed repetitive functions such as digital filters. The DSP acquires data
from the incoming serial pod comm data streams. The data sent to the DSP
is selected by the control words in the pod com memory buffer. Typically
only high acquisition rate data is sent to the DSP.
The DSP has two other communication ports both of which can access the
internal 32Kword memory. The IDMA port is used to DMA data to and from
the common memory. Bus sizing logic converts the DSP 16 bit port to the
32 bit FRONT END bus. During initialization this path is used to download
code to the DSP. The main processor takes control of the DMA port during
this time. Once the system is operational the DSP takes control of the DMA
controller by using its I/O port. The I/O port is a dedicated 8 bit path into the
main FPGA, which allows the DSP access to the DSP DMA controller as
well as other internal FPGA registers, including analog out and QRS sync.
Bus
Sizing
DSP
Engine
32 Kwords
SRAM
IDMA
Port
I/O
Port
Serial
Ports
2181 DSP
DSP DMA
Controller
MUX
Main Processor
(Download)
Front End
Processor
8
32 16
Main FPGA
Memory
Address
Control
32
Front
End
Bus
Pod Com C & D
Pod Com A & B
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