hsp50214a Intersil Corporation, hsp50214a Datasheet - Page 49

• Manufacturer Part Number: hsp50214a
• Description: Programmable Downconverter
• Manufacturer: Intersil Corporation

POSITION
POSITION
POSITION
POSITION
31-28
27-16
15-12
11-0
31-6
31-0
N/A
BIT
BIT
BIT
BIT
4-3
5
2
1
0
CONTROL WORD 10: AGC SAMPLE GAIN CONTROL STROBE (SYNCHRONIZED TO PROCCLK)
Reserved
Upper Limit
Reserved
Lower Limit
Sample AGC Gain
Level
Reserved
Enable External
Timing NCO Sync
Number of Offset
Frequency Bits
Enable Offset
Frequency
Clear Phase
Accumulator
Timing NCO Phase
Accumulator Load
On Update
Timing NCO Center
Frequency
CONTROL WORD 12: TIMING NCO CENTER FREQUENCY (SYNCHRONIZED TO PROCCLK)
CONTROL WORD 11: TIMING NCO CONFIGURATION (SYNCHRONIZED TO PROCCLK)
FUNCTION
FUNCTION
FUNCTION
FUNCTION
CONTROL WORD 9: AGC CONFIGURATION 2 (SYNCHRONIZED TO PROCCLK)
Reserved.
Maximum Gain/Minimum Signal. The upper four bits are used for exponent; the remaining bits
form the mantissa in the fractional offset binary: [eeeemmmmmmmm]. See the AGC Section for
details. Bit 27 is the MSB. The gain is in dB. G = (6.02)(eeee) + 20log
eeee = Floor [log
mmmmmmmm = Floor [512(10
Reserved.
Minimum Gain/Maximum Signal. The upper four bits are used for exponent; the remaining bits
form the mantissa in the fractional offset binary: [eeeemmmmmmmm]. See the AGC Section for
details. Bit 11 is the MSB. The gain is in dB. G = (6.02)(eeee) + 20log
eeee = Floor [log
mmmmmmmm = Floor [512(10
Writing to this location samples the output of the AGC loop filter to stabilize the value for P
reading.
Reserved.
0- SYNCIN2 has no effect on the timing NCO.
1- When SYNCIN2 is asserted, the timing NCO center frequency and phase are updated with
the value loaded in their holding registers. If bit 0 of this word is set to 1, the phase accumulator
feedback is also zeroed.
00 - 8 bits.
01 - 16.
10 - 24.
11 - 32.
0- Zero Offset Frequency to Adder.
1- Enable Offset Frequency.
0- Enable Accumulator.
1- Zero Feedback in Accumulator.
When this bit is set to 1, the P update to the timing NCO frequency or an external timing NCO
load using SYNCIN2 will zero the feedback of the phase accumulator as well as update the
phase and frequency. This function can be used to set the NCO to a known phase synchronized
to an external event.
These bits control the frequency of the timing NCO. The frequency range of the NCO is from 0
to F
puted by the equation: N =(f
register. After loading, a transfer to the Active Register is done by writing to Control Word 14 or
by generating a SYNCIN2 with Control Word 11, Bit 5 set to 1.
RESAMP
where F
HSP50214A
2
2
(10
(10
RESAMP
GAIN dB/20
GAIN dB/20
49
OUT
is the input sample rate to the resampling filter. The bits are com-
GAIN dB/20
GAIN dB/20
)]
)]
/F
RESAMP
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
/2
/2
)*2
eeee
eeee
32
. Bit 31 is the MSB. This location is a holding
- 1)]
- 1)]
10
10
(1.0 + 0.mmmmmmmm)
(1.0 + 0.mmmmmmmm)