Datasheet

Data Sheet AD9547
Rev. E | Page 95 of 104
Table 142. Input Reference Status
Address
Bit
Bit Name
Description
0x0D0C
7
Profile selected
The control logic sets this bit when it assigns Ref A to one of the eight profiles.
[6:4] Selected profile The index (0 to 7) of the profile assigned to Ref A.
Note that these bits are meaningless unless Bit 7 = 1.
3 Valid Ref A is valid for use (that is, it is unfaulted, and its validation timer has expired).
2
Fault
Ref A is not valid for use.
1 Fast If Bit 7 = 1, this bit indicates that the frequency of Ref A is higher than allowed by its profile settings.
If Bit 7 = 0, this bit indicates that the frequency of Ref A is above the maximum input reference
frequency supported by the device.
0
Slow
If Bit 7 = 1, this bit indicates that the frequency of Ref A is lower than allowed by its profile settings.
If Bit 7 = 0, this bit indicates that the frequency of Ref A is below the minimum input reference
frequency supported by the device.
0x0D0D
[7:0]
Same as 0x0D0C but for REF AA instead of REF A.
0x0D0E [7:0] Same as 0x0D0C but for REF B instead of REF A.
0x0D0F [7:0] Same as 0x0D0C but for REF BB instead of REF A.
0x0D10
[7:0]
Unused
Unused.
0x0D11 [7:0]
0x0D12
[7:0]
0x0D13 [7:0]
Table 143. Holdover History
1
Address Bit Bit Name Description
0x0D14
[7:0]
Tuning word
history
Tuning word readback, Bits[7:0].
0x0D15 [7:0] Tuning word readback, Bits[15:8].
0x0D16
[7:0]
Tuning word readack, Bits[23:16].
0x0D17 [7:0] Tuning word readback, Bits[31:24].
0x0D18
[7:0]
Tuning word readback, Bits[39:32].
0x0D19
[7:0]
Tuning word readback, Bits[47:40].
1
These registers contain the current 48-bit DDS frequency tuning word generated by the tuning word history logic.
NONVOLATILE MEMORY (EEPROM) CONTROL (REGISTER 0x0E00 TO REGISTER 0x0E03)
Table 144. Write Protect
Address Bit Bit Name Description
0x0E00
[7:2]
Unused
Unused.
1 Half rate mode EEPROM serial communication rate.
0 (default) = 400 kHz (normal).
1 = 200 kHz.
0
Write enable
EEPROM write enable/protect.
0 (default) = EEPROM is write protected.
1 = EEPROM is write enabled.
Table 145. Condition
Address Bit Bit Name Description
0x0E01 [7:5] Unused Unused.
[4:0] Condition value When set to a nonzero value (default = 0), these bits establish the condition for EEPROM downloads.