ISL5217_05 INTERSIL [Intersil Corporation], ISL5217_05 Datasheet - Page 31

• Manufacturer Part Number: ISL5217_05
• Description: Quad Programmable Up Converter
• Manufacturer: INTERSIL [Intersil Corporation]

NOTES:
21. QASK mode data flow - FIFO -> shaping filter -> interpolating filter
22. FM post mode data flow - FIFO -> FM modulator -> shaping filter -> interpolating filter
23. FM pre mode data flow - FIFO -> shaping filter -> FM modulator -> interpolating filter
24. The Q FIFO is not used when in the FM mode.
14:11
11:10
BIT
BIT
7:4
1:0
15
14
13
12
3:2
15
10
9
8
9
8
7
6
Gain Profile Mode
Clear Sample Phase
FM_Mode Disable
Half Band Filter Enable
Coefficient Switch
Data Span (3:0)
Modulation Type (1:0)
Interpolation Phases
(1:0)
PN-Generator
Reserved
Serial Control,
I and Q Time Slot
FIR control
Gain
Carrier Phase
Carrier Freq
Fixed Integer Mode
Phase Offset (1:0)
FUNCTION
FUNCTION
31
Enables gain profile to slew gain value during transitions of TX enable
When enabled will clear sample phase on immediate update of sample frequency
Enables the fixed integer divider in the sample rate NCO
The phase accumulator of the sample rate NCO can be offset by increments of 90 degrees.
Modulation type(1:0)
1 = update, 0 = no update. PN-Generator is synchronously reset via the channel 0 UPDX signal anded
Not Used.
0 = maintain sample phase
1 = clear sample phase.
Set to 1 to disable the internal FM_Mode signal to the serial interface block. This keeps the I/Q input
sample alignment such that the serial interface block expects both the I and Q time slot counters to count
down to 0 prior to transferring the I/Q samples to the FIFO. Loss of synchronization of the I/Q samples
can occur when switching FM modes without this bit set.
00 = 0
01 = 90
10 = 180
11 = 270
0=Half Band filter bypassed (default).
1=Half Band filter enabled.
Selects second filter coefficients in coefficient RAM.
Data Span(3:0). Number of data samples in shaping filter, 4-16. Load with number of data samples minus
1.
00 = QASK - PSK or QAM modulation.
01 = FM post-filtering - Analog FM modulation. Filtering after FM modulation (baseband filtering provided
before ISL5217). In this mode both I and Q filters are used.
10 = FM pre-filtering - FSK, GMSK modulation. Filtering before FM modulation. In this mode, only the I
filter is used.
11 = Invalid state.
Interpolation Phases(1:0) Number of coarse interpolation phases:
00 = forces coarse and fine phase to zero.
01 = 4.
10 = 8.
11 = 16.
with this mask bit.
1 = Update, 0 = No Update.
TYPE: SINGLE CHANNEL DIRECT, ADDRESS: 0x0d
TYPE: SINGLE CHANNEL DIRECT, ADDRESS: 0x0e
0
0
0
0
TABLE 30. UPDATE MASK
TABLE 29. FIR CONTROL
ISL5217
DESCRIPTION
DESCRIPTION
July 8, 2005
FN6004.3