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Micro Digital X-ray Processor - Technical Reference Manual
Note: The hardware
options included with your
microDXP are specified on
the information sheet
included with the shipment.
mdo-microDXP-MAN-1.1.2
•
Flexible auxiliary digital I/O: 4 general purpose lines, a Gate signal to
externally control data acquisition, the (emerging) industry-standard
I2C bus interface and an external interrupt line.
•
Several assembly options are offered that exclude various hardware and
software features in order to reduce the cost for dedicated applications
(further details in the following section).
1.1.2
Options and Specifications
The microDXP hardware is both powerful and flexible. In many cases,
particularly for dedicated embedded systems, much of the microDXP’s
resources will not be used. XIA is pleased to offer a number of assembly
options that will produce the best value for a given set of requirements. The
specification sheet provided with your microDXP lists the options that have
been implemented. Note: The firmware options and clock speed can be
upgraded in the field, whereas the power supply and gain options require
physical modifications to the hardware. Please contact XIA at
[email protected] for more information about hardware options and
upgrades.
1.1.2.1 Communications and Power Interface
The microDXP hardware offers three communications options via two
high-density connectors: a flat-flex cable for low and medium speed serial
communications and a board-to-board connector that offers both serial protocols
plus high-speed parallel access. In all cases the power, communications and
auxiliary digital I/O is carried on a single connector, and the analog input signal
enters via a separate connection to ensure immunity from electro-magnetic
interference.
The standard assembly offers RS -232 communications and auxiliary
I/O via the flex-cable interconnect. RS-232 runs at 115kbaud, with burst rates
up to 10 Kbytes/sec.
The flex interconnect also supports Analog Devices DSP serial port
(SPORT) communications for faster data transfers, up to 2 Mbytes/sec. This
option is targeted for multi-channel systems and will require some user
hardware and DSP code development.
A third communications option offers parallel IDMA access to DSP
memory for transfer rates up to 10 Mbytes/sec. This interface is used as the
basis for the new MicroComU companion board and microDXP USB Rapid
Development Kit.
1.1.2.2 Power Supplies
Two power supply variants are available, corresponding to whether onboard regulators for the analog supply voltages are used or are bypassed. The
analog circuitry requires +/-5.0V, either supplied directly or indirectly through
on-board LDO regulators. Excessive voltage spikes and/or ripple on the analog
supplies, >20mVpp, can seriously degrade system performance. If +/-5.0V is
supplied directly, either linear regulated or high-quality switching supplies
should be used. If the on-board LDO regulators are used a minimum of +/5.50V is required, and the ripple requirement can be relaxed a bit.
8/6/2009
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