CMG-DM16
The main microprocessor board incorporates a battery-backed
Real-Time Clock and RAM which is used to set the systems
internal software clock at start-up independent of the
availability of the external time reference. The RAM is used to
store system parameters such as the optimum control voltage
setting for the system timebase and the system configuration.
The microprocessor module includes the (multi-tasking) system
operating software in 64K EPROM. This module also has 512k of
static RAM for system workspace and data buffering depending
on the system requirements (number of data channels and
sample rates).
The DSP software consists of 3 cascaded programmable
filter/decimation stages allowing multiple data output rates to
be simultaneously selected. The first stage is set to decimate
the data by 10 resulting in a data output rate of 200
samples/sec. The following 2 stages can be set individually for
decimation factors of 2, 4, 5, 8, and 10 allowing data to be
output at lower rates requiring less storage and transmission
bandwidth. For example, a system can be configured to provide
data at 200, 50, and 10 samples/sec covering the whole of the
seismological broad band range.
The configuration of the DSP is programmable (in the field) via
the host H8 microprocessor. The H8 communicates with the
DSP via its high speed 8-bit ‘host port’, which allows the
operating mode/configuration to be altered and the resulting
processed/filtered data to be acquired.
Each of the serial ports on a module can be configured for a
wide range of standard baud rates (with different settings
available for transmit and receive channels), allowing a wide
range of data links to be used depending on the required data
rates.
The serial port module includes 32k RAM for data buffering and
formatting by the transmission/reception process.
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Issue C
Summary of Contents for CMG-DM16R8
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