1. PCI/PCIe TFP Hardware
Command 0x43: Select Periodic or DDS Output
This command selects the signal that is output on P1 pin 15. This output may be either the Periodic
(heartbeat) signal or the DDS (frequency synthesizer) signal. Note that this selection is restored at
power-up from NV memory.
Byte
Type
Item
Value or Range
0
UINT8
ID
0x43
1
UINT8
Per/DDS
see below
n
0 = Periodic
n
1 = DDS
Command 0x44: Periodic or DDS Output Enable
This command controls the Periodic or DDS signal that is output on P1 pin 15. This output may be
either on or off based on the selection.
Note: that this selection is restored at power-up from NV memory.
Byte
Type
Item
Value or Range
0
UINT8
ID
0x44
1
UINT8
Dis/En
see below
n
0 = Disabled
n
1 = Enabled
Command 0x45: DDS Divide Select
The DDS frequency synthesizer's divider can be used to divide the selected input down to generate
lower or fractional frequencies. Selectable decade divides that range from divide by 1E0 through
divide by 1E7 are available. The divider will also allow for fractional frequency outputs where the divid-
er's input source is decimal shifted by up to 7 places. The frequency synthesizer's divider is the out-
put signal provided on P1 pin 15.
Note that this selection is restored at power-up from NV memory.
Byte
Type
Item
Value or Range
0
UINT8
ID
0x45
1
UINT8
Div val
see below
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