AD6426 Analog Devices, AD6426 Datasheet - Page 24

• Manufacturer Part Number: AD6426
• Description: Enhanced GSM Processor
• Manufacturer: Analog Devices

Rx Timing Control
RXON
The signal at the output pin RXON is generated by the
function Receive Enable OR Monitor Enable of the RADIO
CONTROL CC Control Register 2. It can be used to enable
the RF receiver and controls the RXON-pin of the AD6425. In
radios based on the Siemens solution this signal would be
connected to the RXON1 input. Additional RXON derived
signals are provided to support this solution.
CALIBRATERADIO
The 4 modes of the Autocalibrate signal (Type 0 & 1, AutoCal
on/off) are provided as required by the ADI or Philips solution
and shown in Figure 8.
The flags Autocalibrate and Calibrate Radio in the SYSTEM
CC Control Register 0 are OR´ed and connected to the output
pin CALIBRATERADIO.
The type of autocalibration is set in the TRAFFIC MODE CC
Control Register 6
In radios based on the Siemens chipset, this signal would
connect to the RXON2 input. The required behavior is enabled
by selecting the Type 1 CalibrateRadio function.
This Information applies to a product under development. Its characteristics and specifications are subject to change without notice. Analog Devices assumes no
obligation regarding future manufacture unless otherwise agreed to in writing. No responsibility is assumed by Analog Devices for its use; nor for any
infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent
rights of Analog Devices.
Revision Preliminary 2.3 (June 9, ´98)
Preliminary Technical Information
TYPE=0, AUTOCAL=0
TYPE=0, AUTOCAL=1
TYPE=1, AUTOCAL=0
TYPE=1, AUTOCAL=1
Bit
Bit
Bit
2
1
7
3
3
RADIO CONTROL CC Control Register 2
Monitor Enable
Receive Enable
the SYSTEM CC Control Register 0
Autocalibrate
Enables the autocalibrate function if set to 1;
Calibrate Radio
TRAFFIC MODE CC Control Register 6
Autocalibration Type
RXON
Figure 8. Autocalibration
RxEnable
Start (early)
RxEnable
Start (late)
AutoCalibrateEnd
RxEnableEnd
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Synthesizer Control
The radio interface of the AD6426 supports 2 dynamic
synthesizers, with each capable of downloading data on
demand.
The two Synthesizer Load Dynamic flags located in the
SYNTH CONTROL CC Control Register 38, will set the
synthesizer interface to load 3 consecutive long-words from
Layer 1.
When using the Configure Dynamic Synthesizer flag in the
SYNTH BIT COUNT CC Control Register 37, the download-
on-demand function is applied to the synthesizer selected by
SLD0 or SLD1.
Each dynamic synthesizer is comprised of three 32-bit word
registers, for the Rx, Tx and Monitor phases. The download
on demand uses the Rx register only for the respective
synthesizer.
7 : 0
7 : 0
7 : 0
7 : 0
Bit
Bit
Bit
Bit
Bit
Bit
7
6
2
1
6
SYNTH CONTROL CC Control Register 38
Synthesizer Enable Polarity
Selects the polarity of the SYNTHEN outputs.
If set to 0, SYNTHEN is an active low signal,
if set to 1, SYNTHEN is an active high signal.
Synthesizer Enable Type
Selects the active period of the SYNTHEN outputs.
When set to 0, SYTHEN is active for all data values
determined by SYNTHESIZER BIT COUNT; when
set to 1, SYNTHEN goes active after the last bit for
one SYNTHCLK period.
Synthesizer Load Dynamic 1 (SLD1)
Synthesizer Load Dynamic 0 (SLD0)
SYNTH BIT COUNT CC Control Register 37,
Configure Dynamic Synthesizer
SYNTHESIZER 1 CC Control Register 40
Synthesizer (31:24)
SYNTHESIZER 2 CC Control Register 41
Synthesizer (23:16)
SYNTHESIZER 3 CC Control Register 42
Synthesizer (15:8)
SYNTHESIZER 4 CC Control Register 43
Synthesizer (7:0)
Confidential Information
AD6426