Instrument Function > RF Block > RF Sweep and List Mode > List Mode > List Mode Extern Hop
List Mode Extern Hop

The Extern Hop control signals (clock, strobe and data) are supplied via the serial FHOP bus on the "AUX I/O" interface at the rear of the instrument.

Data transmission starts with the MSB (most significant bit). A strobe marks the LSB (least significant bit) and thus the end of a valid data sequence (40 bits). The data bits determine the RF path, the Extern Hop mode (direct or not) and the processed list index. The timing of the control signals is illustrated in the following figure.

Function of data bits of FHOP bus (fhop_data line) and their function for controlling fast frequency hopping

Data bit name (bit number)

Function

path (39)

Bit 39 must be set to 0

imm_n (38)

Selects Fast Hop mode:
  • 0 = Fast Hop Direct
    the selected settings are performed at once after data transfer of a complete sequence (40 bits) without additional triggering
  • 1 = Fast Hop
    the selected settings are performed after an instrument trigger

cmd (37 to 32)

Selects function for fast hop mode.

Bit 32 must be set to 1 (= List Mode)

Bit 37 to 33 must be set to 0 (= reserved for future extensions)

data (31 to 0)

Data bits

Determine the list index (frequency/level setting) to be processed for List Mode

Example: 

The bit sequence 0100-0010-0000-0000-0000-0000-0000-0000-0000-1010 on data line "fhop_data" selects the list index 10 of the currently loaded list on Path A. The frequency and level setting associated with this index are performed after the next instrument trigger.

Preconditions:

List Mode "Extern Hop" is selected in the "List" menu and a list with at least 10 entries is loaded.

An external trigger is provided at the INST TRIG connector.

 


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