Datasheet

Data Sheet AD9957
Rev. C | Page 51 of 64
Table 14. RAM, ASF, Multichip Sync, and Profile 0 Registers
Register Name
(Serial Address)
Bit Range
(Internal
Address)
Bit 7
(MSB) Bit 6 Bit5
Bit
4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB)
Default
Value
RAM Segment
Register 0 (0x05)
<47:40> RAM Address Step Rate 0<15:8>
<39:32> RAM Address Step Rate 0<7:0>
<31:24> RAM End Address 0<9:2>
<23:16> RAM End
Address 0<1:0>
Open
<15:8>
RAM Start Address 0<9:2>
<7:0> RAM Start
Address 0<1:0>
Open RAM Playback Mode 0<2:0>
RAM Segment
Register 1 (0x06)
<47:40> RAM Address Step Rate 1<15:8>
<39:32> RAM Address Step Rate 1<7:0>
<31:24> RAM End Address 1<9:2>
<23:16> RAM End
Address 1<1:0>
Open
<15:8> RAM Start Address 1<9:2>
<7:0> RAM Start
Address 1<1:0>
Open RAM Playback Mode 1<2:0>
Amplitude Scale
Factor (ASF)
Register
(0x09)
<31:24> Amplitude Ramp Rate<15:8> 0x00
<23:16> Amplitude Ramp Rate<7:0> 0x00
<15:8> Amplitude Scale Factor<13:6> 0x00
<7:0> Amplitude Scale Factor<5:0> Amplitude Step Size<1:0> 0x00
Multichip Sync
Register (0x0A)
<31:24> Sync Validation Delay<3:0> Sync
Receiver
Enable
Sync
Generator
Enable
Sync
Generator
Polarity
Open 0x00
<23:16> Sync State Preset Value<5:0> Open 0x00
<15:8>
Sync Generator Delay<4:0>
Open
0x00
<7:0> Sync Receiver Delay<4:0> Open 0x00
Profile 0
Register—Single
Tone (0x0E)
<63:56> Open Amplitude Scale Factor<13:8> 0x08
<55:48> Amplitude Scale Factor<7:0> 0xB5
<47:40> Phase Offset Word<15:8> 0x00
<39:32> Phase Offset Word<7:0> 0x00
<31:24> Frequency Tuning Word<31:24> 0x00
<23:16> Frequency Tuning Word<23:16> 0x00
<15:8> Frequency Tuning Word<15:8> 0x00
<7:0> Frequency Tuning Word<7:0> 0x00
Profile 0
Register—QDUC
(0x0E)
<63:56> CCI Interpolation Rate<7:2> Spectral Invert Inverse
CCI Bypass
0x00
<55:48> Output Scale Factor 0x00
<47:40>
Phase Offset Word<15:8>
0x00
<39:32> Phase Offset Word<7:0> 0x00
<31:24> Frequency Tuning Word<31:24> 0x00
<23:16> Frequency Tuning Word<23:16> 0x00
<15:8> Frequency Tuning Word<15:8> 0x00
<7:0> Frequency Tuning Word<7:0> 0x00