©2018
Rev 2.0
25
Hardware Registers
Bits Type Name
Width Description
[47:0]
W
Frequency word
48
Frequency word in milli-Hz (mHz); mHz used for
future compatibility
[55:48]
W
Used
8
Set to zeros
[7:0]
R
Read back byte
8
Read 1 byte back is required for PXIe and RS232
Register 0x12 RF_AMP
This register enables and disables the RF amplifier.
Bytes written 2
Bytes read 1
Bits Type Name
Width Description
[0]
W
Frequency word
1
0 = Disables the RF amplifier
1 = Enables the RF amplifier
[7:1]
W
Unused
7
Set to zeros
[7:0]
R
Read back byte
8
Read 1 byte back is required for PXIe and RS232
Register 0x13 ATTENUATOR
This register sets the value of the device attenuators.
Bytes written 4
Bytes read 1
Bits
Type
Name
Width
Description
[7:0]
W
Attenuator value
8
In 0.25 dB steps, i.e. LSB = 0.25 dB
[10:8]
W
The target
attenuator
3
The attenuator number:
0 = RF Atten #1
1 = RF Atten #2
3 = IF3 Atten #1
4 = IF3 Atten #2
[23:11]
W
Unused
13
Set to zeros