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TDT RX7 User Manual

Stimulator base station
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RX7 Stimulator Base Station
RX7 Overview
The RX7 base station is a high performance processor available with either two or
five 100 MHz, 1600 MFLOPS Sharc DSPs. You can use the base station's onboard
DSPs to design and generate complex arbitrary waveforms or complex patterns of
biphasic pulses in real-time. The RX7 has been developed specifically for
microstimulation applications. As part of TDT's RX7G MicroStimulator system, the
RX7's primary role is to control the MS16 stimulus isolator, transferring hardware
control and stimulation information across fiber optics. This proven digital
communication system optically isolates the RX7 from the electrical stimulator,
eliminating AC power surges and noise. For more information see "MS4/MS16
Stimulus Isolator" on page 7-3.
The RX7 includes 40 bits of digital I/O, analog output, and can include one or two
fiber optic input ports for acquisition of digitized data from Medusa preamplifiers.
Acquired signals can be filtered, rectified, or smoothed for stimulus output or dynamic
real-time stimulus control based on analog control signals from virtually any signal
source.
Power and Communication
The RX7 mounts in a System 3 zBus Powered Device Chassis (ZB1PS) and
communicates with the PC using the Optibit (PO5/FO5) PC interface. The ZB1PS
is UL compliant, see the
Software Control
Software control is implemented with circuit files developed using TDT's RP Visual
Design Studio (RPvdsEx). Circuits are loaded to the processor through TDT run-
time applications or custom applications. This manual includes device specific
information needed during circuit design. For circuit design techniques and a complete
reference of the RPvdsEx circuit components, see the
ZB1PS Operations Manual
for power and safety information.
RPvdsEx Manual
.
RX7 Stimulator Base Station
3-35

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  • Page 1 AC power surges and noise. For more information see “MS4/MS16 Stimulus Isolator” on page 7-3. The RX7 includes 40 bits of digital I/O, analog output, and can include one or two fiber optic input ports for acquisition of digitized data from Medusa preamplifiers.
  • Page 2 DSP are minimized, allowing more processor power (cycles) for communication and overhead tasks. The RX7 contains two DB25 connectors for interfacing with 40 bits of digital I/O and 4 channels of analog output. A BNC connector is provided for access to the first analog output channel.

  • Page 3: Distributing Data Across Dsps

    Up to five LEDs report the status of the multiprocessor's individual DSPs. When the device is turned on, they will glow steadily. If the demands on a DSP exceed 99% of its capacity on any given cycle, the corresponding LED will flash very rapidly (~3 times per second). Front Panel VFD Screen RX7 Stimulator Base Station...

  • Page 4: Fiber Optic Output Port (Stimulator)

    The fiber optic cable that carries the signals to the fiber optic input ports on the RX7 has a transfer rate limitation of 6.25 Mbits/s. With 16 channels of data and 16 bits per sample, this limitation translates to a maximum sampling rate of ~25 kHz.

  • Page 5: Amp Status And Clip Warning Lights

    4X or ~100 kHz. This will allow an RX7 to run a DSP chain at ~50 kHz or ~100 kHz, and still sample data acquired through an optically connected preamplifier that digitized the incoming data stream at its maximum rate of ~25 kHz.

  • Page 6: Analog Output

    The upsampler is controlled through one of the RX7's programmable bits and can be turned off to allow the D/A to drive external devices such as a stimulator. Channel one analog output can be accessed via a front Panel BNC (DAC-1).
  • Page 7 Click the Device Setup command on the Implement menu. 2. In the Set Hardware Parameters dialog box, click the Device Type box and select the RX7 Elec-Stimulator from the list. The dialog expands to display the Device Configuration Register. 3. Click Modify to display the Edit I/O Setup Control dialog box.

  • Page 8: Rx7 Technical Specifications

    XLink The XLink is not supported at this time. RX7 Technical Specifications The RX7 is designed for use with the MS16 stimulus isolator. The RX7 is also equipped with a fiber optic input port for use with Medusa or Adjustable Gain preamplifiers.
  • Page 9 40 bits programmable (8 bits bit-addressable and a 32 bit Digital I/O word, addressable as 4 bytes) * Note: When used with the microstimulator, the sampling rate is limited to 24.414 kHz by the Stimulator Fiber Optic Port. RX7 Stimulator Base Station...

  • Page 10: Db25 Connector Pinouts

    Bits 0, 2, 4, and 6 Word addressable digital I/ Bits 1, 3, 5, and 7 Byte B Word addressable digital I/O Byte B Bits 0, 2, 4, and 6 Word addressable digital I/ Bits 1, 3, 5, and 7 RX7 Stimulator Base Station...

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