L64724 LSI Logic Corporation, L64724 Datasheet - Page 56

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

3.5.5 NCO Frequency Deviation (Group 3: APR 7, 8, and 9)
3-26
Read/Write: R
Demod_SNR Demodulator Signal to Noise Ratio
XCTR_IN
Reserved
Chip_ID
The L64724 puts the result of the Carrier Loop NCO (number-controlled
oscillator) frequency measurement into the NCO Frequency Deviation
24-bit register. The value, in Hz, corresponds to the frequency deviation
observed in the carrier loop as a function of the Low Noise Block
Converter (LNB) drift. To see the updated 24-bit CAR_NCOF value, first
access APR7.
L64724 Registers
APR
6
Demod
_SNR
D7
XCTR_IN
When read, the Demod_SNR bit gives an indication of
the SNR. When the SNR is bad (above the threshold),
the bit is 0. When the SNR is good (below the threshold),
the bit is 1. The thresholds are discussed in
5.7.2.1, “Phase Error Estimator,” page
Figure
External Control Input Bit
When read, the XCTR_IN bit shows the logic level
applied to the External Control Input (XCTR_IN) pin.
Reserved
These bits are reserved.
Chip Identification
When read, this bit shows the stepping of the L64724 IC.
When the Chip_ID bit is 1, it indicates that the L64724 IC
is an L64724b. When the bit is 0, it indicates that the IC
is an L64724a.
D6
5.7.
D5
Reserved
Reset Value: 0x0000
5-16, and shown in
D1
Section
Chip_ID
D0
[5:1]
7
6
0