Cirrus Logic CDB5490U - Manual (Page 22)

CDB5490U
22 DS923DB5
2.5.1.8 Phase Compensation
The Phase Comp Register section is used to make changes to and display the contents of the CS5490's
PC (Phase Compensation Control) register. The PC register allows coarse- and fine-phase adjustment
on each channel of the CS5490 data path. Refer to the CS5490 data sheet for descriptions of the PC reg-
ister bits.
2.5.1.9 Integrator Gain, System Gain
The Integrator Gain and System Gain sections display the signal path gain in both hexadecimal and dec-
imal format. Each register can be modified by typing a value in the corresponding Decimal or HEX field.
2.5.1.10 Sample Count, Cycle Count, Settle Time
The Sample Count Register, Cycle Count Register, and Settle Time sections provide fields to display the
values of registers associated with low-rate calculations. The SampleCount and CycleCount registers are
entered or displayed in decimal format by default. The user may select to enter or view other number for-
mats of the register by selecting the "d" within the field. The value of the T
Settle
register is displayed in both
hexadecimal and decimal format. Each register can be modified by typing a value in the corresponding
field.
2.5.1.11 ZX
NUM
When Automatic Frequency Update is enabled, the ZX
NUM
section is used to adjust the number of zero
crossings used in the Epsilon calculation. The update rate of Epsilon is increased by reducing the zero
crossings. The register can be modified by typing the number of zero crossings.
2.5.1.12 Epsilon
The Epsilon section is used to display and adjust the Epsilon register (the ratio of the AC line frequency
to the output word rate). The Epsilon register can be updated either through entering the AC line frequen-
cy in the Line Freq field or by entering the direct register value in the HEX field.
2.5.1.13 Mask Register
The Mask Register box displays the value for the Mask register in hexadecimal format and decodes them
to indicate each bit's function. The Mask register can be modified by typing a value in the HEX field, or by
checking the appropriate boxes for the bits that are to be masked. The value present in the Mask register
may be changed by the GUI software during certain operations to provide correct functionality of the
CDB5490U board.
2.5.1.14 Temperature Registers
The Temperature Registers box is used to adjust the temperature offset register (T
OFF
) and temperature
gain register (T
GAIN
) to convert the temperature register (T) from the Celsius scale to the Fahrenheit scale
or vice versa and to improve temperature measurement accuracy. Refer to the CS5490 data sheet for
details of the on-chip temperature sensor.
2.5.1.15 Zero-crossing Level and No Load Threshold
The Zero-crossing Level and No Load Threshold boxes display the values for these registers in hexadec-
imal and decimal. Each register can be modified by typing a value in the corresponding Decimal or HEX
field.