Availability:
     Level 4    , 'B'

  Quick Help:
     Enable / Disable RVFF, B[NewRvffControlMode]

  Description:
    This command is used to enable / disable RVFF control in servo.

  Input Parameters:

    0 - New RVFF control mode to be used in servo.
    
       This parameter specifies the new RVFF control mode to be used in servo.
       Here is meaning of each bit of the RVFF control mode:
    
          Bit 0 = 0 then disable rv current injection
                = 1 then enable rv current injection
          Bit 1 = 0 then bypass velocity control portion of rv_ff code
                = 1 then execute velocity control portion of rv_ff code
          Bit 2 = 0 then bypass track following control portion of rv_ff code
                = 1 then execute track following control portion of rv_ff code
          Bit 3 = 0 then disable the averaging funtion in the track following portion
                = 1 then enable the averaging funtion in the track following portion
          Bit 4 = 0 then disable filtx gain parameter adaptation
                = 1 then enable filtx gain parameter adaptation
          Bit 5 = 0 then disable rv data acquisition during twiddle
                = 1 then enable rv data acquisition during twiddle
          Bit 6 reserved
          Bit 7 = 0 then disable rv current injection in velocity/settle mode
                = 1 then enable rv current injection in velocity/settle mode
          Bit 8 = 0 then Normal Code (RVFF IIR is tuned up for NearLine RV Spec)
                = 1 then Enable 2nd RVFF IIR Tuneup for DeskTop RV Spec
          Bit 9 = 0 Normal code
                = 1 McKinley DT Shock Detect method with external shock sensor is enabled
          Bits 10 - 15 reserved
    
       When this parameter is not entered, this command will simply display the current
       RVFF control mode without changing it.
    
          Type: Unsigned 16-bit value
    
          Range: 0 to 0xFFFF
    
          Default: None.

  Output Data:


    If an error occurred, the following information will be displayed.
    
          "DiagError aaaaaaaa"
    
       where
    
          aaaaaaaa is the Diagnostic Error Code
    
    If no error occurred, the RVFF Control Mode information will be displayed as follows.
    
          "RVFF control mode: xxxx"
    
       where
    
          xxxx is the RVFF control mode in hex.
    
  Revision History:

    0001.0000   Initial revision.
    0011.0000   Combined the PSG Diagnostic Error Codes (PSGDEC) and the Diagnostic External
                Test Service Error Codes (DETSEC) into a single set of Diagnostic Error Codes
                (DiagError).