Siemens SC 7000 Service Manual page 30

Service Manual
3.3 Video Output
32
32
Front
End
Bus
Memory
Address
Figure 2-5 DSP Subsystem
4 DSP Subsystem
14
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.
16
Bus
Sizing
Control
Main FPGA
DSP DMA
Controller
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.
Siemens Medical Systems, EM-PCS, Danvers
NOT A CONTROLLED DOCUMENT
2181 DSP
32 Kwords
DSP
Engine
SRAM
I/O
IDMA
Port Port
8
MUX
SC 7000 and SC 9000XL Patient Monitors
Serial Front End
Ports Processor
Pod Com C & D
Pod Com A & B
Main Processor
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