Table Of Contents

User Command Reference

Version:
    Last Modified: April 24, 2017

    The NI-5791 allows you to configure settings with the User Command, User Data 0, and User Data 1 signals.

    The status register returns 0x00 if the command succeeded. The status register returns a non-zero value if there is a problem with the command. Ensure that all user commands and arguments are valid before you commit the command to the hardware. Once you commit the command, the CLIP brings the idle signal low, processes the command, acknowledges the command, and reports idle.

    Read the user return and user status ports only after the CLIP returns to idle. The CLIP holds the values until you issue the next command.

    User Setting User Command User Data 0 Value (U8) User Data 1 Value
    Set Clock Select

    Sets the sample clock to the specified setting.

    0

    0 = Internal Sample clock

    1 = Internal Sample clock locked to an external Reference clock through the CLK IN connector

    2 = External Sample clock through the CLK IN connector

    3 = Internal Sample clock locked to an external Reference clock through the IoModSyncClock

    N/A
    Set CLK Out Source

    Determines the CLK OUT output.

    1

    0 = disabled

    1 = Reference Clock

    2 = Sample Clock

    N/A
    DAC Sync User Start

    Sets up the DAC to receive a user-supplied SYNC pulse. After this command returns, send a rising edge on the Synchronize DAC CLIP signal to send a SYNC pulse to the DAC, then send CmdDacSyncUserEnd. refer to the DAC datasheet for the use of the SYNC signal.

    2 N/A N/A
    Enable Baseband Amp

    Turns the baseband amplifier on and off, and enables and disables the baseband amplifier.

    5

    0 = off

    Non-zero = on

    N/A
    Set Rx Attenuation Pre-LNA

    Sets the Rx Programmable attenuator before the low-noise amplifier (LNA) to the attenuation specified in UserData0.

    7 Attenuation (.25 dB per LSB, max 31.75 dB or 0x7F) N/A
    Set Rx Attenuation Post-LNA

    Sets the Rx Programmable attenuator after the LNA to the attenuation specified in UserData0

    8 Attenuation (.25 dB per LSB, max 31.75 dB or 0x7F) N/A
    Set Tx Attenuation

    Sets the Tx Programmable Attenuator to the attenuation specified in UserData0.

    9 Attenuation (.25 dB per LSB, max 31.75 dB or 0x7F) N/A
    Set LO Filter

    Configures the Tx LO filter path.

    32 0 = Rx LO Byte setting.
    Table 1. RX LO
    Byte Cut-off Frequency (MHz)
    0xF1 316
    0xEA 474
    0xE3 711
    0xDC 1,066
    0xD5 1,600
    0xCE 2,400
    0xC7 3,600
    0xF8> >3,600
    Table 2. TX LO
    Byte Cut-off Frequency (MHz)
    0xF1 316
    0xEC 474
    0xE9 711
    0xD6 1,066
    0xD3 1,600
    0xCE 2,400
    0xCB 3,600
    0xF4 >3,600
    Set Front End Filter

    Configures the Tx front end filters.

    33 0 = Rx Byte setting.
    Byte Cut-off Frequency (MHz)
    0x00 <3,600
    0x01 <2,400
    0x02 <1,600
    0x03 <1,066
    0x04 <711
    0x05 <474
    0x06 <316
    0x07 >3,600
    Set LO Power

    Turns the LO and the LO power supply on and off.

    34 0 = LO

    0 = off

    Non-zero = on

    Set Routing Mux

    Configures all the multiplexers that control LO paths and signal paths (not including filters). Each mux is either 2:1 or 1:2, so there are only two options for UserData1 per mux.

    37

    Refer to the MUX Select Enumeration table below.

    0 = off/default

    Non-zero = on

    Refer to the MUX Select Enumeration table below.

    Read Revision Lower

    Reads the lower two bytes of the CLIP Revision.

    240 N/A N/A
    Read Revision Upper

    Reads the upper two bytes of the CLIP Revision.

    241 N/A N/A
    Read Oldest Compatible Revision Lower

    Reads the lower two bytes of the oldest compatible revision of the CLIP.

    242 N/A N/A
    Read Oldest Compatible Version Upper

    Reads the upper two bytes of the oldest compatible revision of the CLIP.

    243 N/A N/A
    Reinitialize

    Reinitializes the module and CLIP. The CLIP pulls the Initialization Done signal low before acquiring the Reinitialize command. Wait for the Initialization Done signal to go high before proceeding.

    255

    Refer to the MUX Select Enumeration table below.

    0 = off/default

    Non-zero = on

    Refer to the MUX Select Enumeration table below.

    Mux Select Enumeration

    Use the following table to configure the multiplexer.

    Value Name Setting
    0 LoSource
    • 0 = Internal LO
    • Non-zero = External LO
    2 LoOut
    • 0 = LO Out off
    • Non-zero = LO Out on
    3 TxModBypass
    • 0 = Tx modulator bypass disable
    • Non-zero = Tx modulator bypass enable
    4 RxPath 0 = Rx In Non-zero = Internal wrapback
    5 TxPath 0 = TX Out Non-zero = Internal wrapback

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