Contributions:RHX

Synopsis

The Intan RHS has four SPI ports (with each port labelled A,B,C,D) which sends data to a FPGA. These ports communicate with the chips located on supported headstages. Each port has four output signals responsible for communication with the amplifier chips, two of which (MISO1,MISO2) are used to transmit data. Each chip controls 16 channels, and each chip transmits data over a single MISO line. Over all four ports, this means there are 8 lines over which data can be sent.

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  RHS2116 Amplifier chip on 32 channel headstage

Attatched to the FPGA is an Opal Kelly XEM6010 USB/FPGA interface which can be used to read data in the FPGA via USB. This module has 128MByte SDRAM

Parameters

SamplingRate: Due to the RHS's ability to only take on discrete sampling rates, a value matching one of the following must be used for this parameter (given in Hz): 1000, 1250, 1500, 2000, 2500, 3000, 3333, 4000, 5000, 6250, 8000, 10000, 12500, 15000,20000 ,25000, 30000.

SampleBlockSize: The API provided by Intan only reads data in chunks of 128. Therefore, values that are multiples of 128 must be used for this parameter.

ConnectionType: Determines type of connection to be used. For devices with a XEM7310 module (which can be found via the connected device list given in the Intan RHX application or by looking at the specifications for the device in use), use ControllerStimRecord. Otherwise, depending on the USB connection, choose USB2 or USB3.

Stimulation Configuration Parameters:

Channels: Specifies the channels which the configuration applies to. Accepted formats are of the following: For a range of sequential channels, an input of "A-B" will result in the configuration being uploaded to channels A,A+1...B. For a single channel, one may simply input the channel number as "A". For channels that are not sequential, one may input "{A-B,C,D-E,..}". This will upload the configuration to channels A,A+1..B,C,D,D+1...E... . Lists of this form must use commas to separate channel values/ranges.

Trigger: Specifies the source which triggers stimulation. This can either be one of the digital or analog inputs, or a state. Accepted input is: "digx", "anax", or "state", where x is an integer between 1 and 8 (all independent of capitalization). If "state" is used, "State Trigger Value" must be specified.

State Trigger Value: If using a state as a trigger, this section determines the condition for the state to trigger stimulation.