Sundance SMT391-VP User Manual

Page 26

Version 1.3

Page 26 of 41

SMT391-VP User Manual

0x2

0x022

0x023

0x024

0x025

SMT338-VP Serial No

Byte A

Byte B

Byte C

Byte D

0x2

0x02A

0x02B

0x02C

0x02D

SMT391 Serial No

Byte A

Byte B

Byte C

Byte D

Figure 10 – Serial Number Registers Cont. (Read Only).

ADC Clock Source Registers (Write Add 0x801)

The ADC can receive a clock from the on-board VCO or the on-board clock
synthesizer. The following table shows the different combinations for setting up the
SMT391 clock tree.

Register

Value

ADC Clock Source

0x0000 On-board

VCO

0x0001 On-board

Clock

Synthesizer

Figure 11 – Clock Source Selection Table (Write Only).

31 .. 28

27 .. 24

23 .. 20

19 .. 16

15 .. 12

11 .. 8

7 .. 4

3 .. 0

Command

Address

Data MSB

Data LSB

0x1

0x801

0x00

Clock Register Value

Figure 12 – Clock Source Register (Write Only).

Clock Synthesizer Setup Register (Write Add 0x800)

This register sets up the frequency of the clock synthesizer on the SMT391. Any write
operation to this register will trigger the clock synthesizer interface control logic to
initialize the clock synthesizer with its new value.