tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 55

• Manufacturer Part Number: tda5235
• Description: Enhanced Sensitivity Double-configuration Receiver With Digital Baseband Processing
• Manufacturer: Infineon Technologies Corporation

Figure 25
2.4.8.6
The Frame Synchronization Unit (Framer) synchronizes to a specific pattern to identify
the exact start of a payload data frame within the data stream. This pattern is called
Telegram Start Identifier (TSI).
There are different TSI modes selectable via the configuration:
•
•
•
•
All SFRs configuring the Frame Synchronization Unit support the Multi-Configuration
capability (Config A and B). The Framer starts working in Run Mode Slave after Symbol
Sync found and in Self Polling Mode after wake-up found and searches for a frame until
TSI is found or synchronization is lost. The input of the Framer is a sequence of Bi-phase
Data Sheet
WUW Chip Counter elapsed
16-Bit TSI Mode, supporting a TSI length of up to 16 bits or 32 chips
8-Bit Parallel TSI Mode, supporting two independent TSI pattern of up to 8 bits length
each. Different payload length is possible for these two TSI pattern.
8-Bit Extended TSI Mode, identical to 8-Bit Parallel TSI Mode, but identifies which
pattern matches by adding a single bit at the beginning of the data frame
8-Bit TSI Gap Mode, supporting two independent TSI pattern separated by a
discontinuity
(WUW Chip Counter =
SSync =0
WUBCNT)
Wakeup Criteria=Pattern Detection
Frame Synchronization
Pattern Detection
Pattern Match=1
No WU=0
SSync=1
WU=0
Wake-Up Data Criteria Search
Init Wakeup Unit
WUW Chip Counter <
WUBCNT
SSync=0
CV=1
Reset
Wakeup Criteria=Random Bits Detection
(WUW Chip Counter = WUBCNT)
WUW Chip Counter elapsed
Random Bits Detection
No Wake-Up
No WU=0
No WU=0
Wake-Up
No WU=0
No WU=1
SSync=1
WU=0
WU=0
WU=1
WU=0
Idle
SSync Search Time Elapsed = 1
WUW Chip Counter <
WUBCNT
SSync =0
WUW Chip
Counter<WUBCNT
55
Wakeup Criteria=Equal Bits Detection
(WUW Chip Counter = WUBCNT)
WUW Chip Counter elapsed
Equal Bits
No WU=0
SSync=1
Detection
WU=0
Bit Change Detected=1
Functional Description
SSync= 0
CV= 1
V1.0, 2010-02-19
Wakeup Criteria=Valid Data Rate
TDA5235
Detection
SSync =1