L64777 LSI Logic Corporation, L64777 Datasheet - Page 74

• Manufacturer Part Number: L64777
• Description: DVB Qam Modulator
• Manufacturer: LSI Logic Corporation

4.2.3 Register 14
4-12
RES
7
MEASURE-
START_
MENT
6
RES
START_MEASUREMENT
ENABLE_NCO_ LOOP
MASK_NCO_IRQ
AUTO_ACQUISITION_ON
MASK_ACQ_IRQ
EN_PHASE_LOOP
Register Descriptions
NCO_LOOP
ENABLE_
5
MASK_NCO_
Reserved
This bit is reserved.
A transition from 0-to-1 starts a measurement of the byte
clock connected to the ICLK input. MEASUREMENT_
DONE in status register (13) indicates the end of the
measurement. The reset value is 0.
Setting this bit allows a step update in the NCO loop
based on the FIFO fullness. The REF_DUR parameter
can adjust the update frequency. The reset value is 0.
Setting this bit enables the interrupt for the
MEASUREMENT_DONE event. Even in the case of a
disabled interrupt, the status is indicated correctly. The
reset value is 0.
A 1-to-0 transition in this bit starts an internal procedure
to regulate the NCO frequency. The reset value is 0.
Setting this bit to 1 activates the autoacquisition mode.
If this bit is 1, a transition from 1 to 0 in the
AUTO_ACQUI_RUNNING bit of register 13 causes an
interrupt. The interrupt is visible in the NCO_EVENT bit
of register 12 and clears upon the reading of register 13.
The reset value is 0.
Setting this bit enables the phase acquisition loop, after
Autofrequency Acquisition is completed in the NCO mode
of operation. The reset value is 0.
IRQ
4
ACUISITION
AUTO_
_ON
3
MASK_ACQ_
IRQ
2
EN_PHASE_
LOOP
1
FIFO_INT
R/W 6
R/W 5
R/W 4
R/W 3
R/W 2
R/W 1
0
7