13 dds0 register – 0xc – frequency tuning word 0, 14 dds0 register – 0xd – phase offset word, 15 dds0 register – 0xe – frequency tuning word 1 – Sundance SMT399-160 User Manual
Page 26: Dds0 register – 0xc – frequency tuning word 0, Dds0 register – 0xd – phase offset word, Dds0 register – 0xe – frequency tuning word 1
DDS0 Register – 0xB – Frequency Tuning Word 0
Setting
Frequency
Tuning
Word 0
Description
The frequency tuning word is a 32-bit register that controls the rate of accumulation in the phase
accumulator of the DDS core.
5.4.13 DDS0 Register – 0xC – Frequency Tuning Word 0.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0xC – Frequency Tuning Word 0
Byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
Frequency Tuning Word 0[23:16]
Default
‘00000000’
1
Frequency Tuning Word 0[31:24]
Default
‘00000000’
DDS0 Register – 0xC – Frequency Tuning Word 0
Setting
Frequency
Tuning
Word
Description
The frequency tuning word is a 32-bit register that controls the rate of accumulation in the phase
accumulator of the DDS core.
5.4.14 DDS0 Register – 0xD – Phase Offset Word.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0xD –Phase Offset Word
Byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
Phase Offset Word[7:0]
Default
‘00000000’
1
Not Used
Phase Offset Word[13:8]
Default
‘00’ ‘000000’
DDS0 Register – 0xD – Phase Offset Word
Setting
Phase
Offset
Word
Description
The phase offset word is a 14-bit register that stores a phase offset value.
5.4.15 DDS0 Register – 0xE – Frequency Tuning Word 1.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0xE – Frequency Tuning Word 1
Byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
Frequency Tuning Word 1[7:0]
Default
‘00000000’
User Manual SMT399-160
Page 26 of 39
Last Edited: 24/05/2007 17:12:00