tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 62

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

Please note that after a gap, the internal TSI comparison register is cleared (all chips set
to ’0’). In this case, a TSI B criteria of “0000” would always match at the beginning. To
avoid such an unwanted matching, set the highest TSI B match chip to ’1’.
Figure 33
The TVWIN (Timing Violation WINdow) and TSIGAP dependency is shown in
Figure 34
TVWIN calculation for pattern without Gap time:
The entire TVWIN time is made up of the CV
the half bit after the CV. To reach all frequency and duty cycle errors, 25% of the overall
sum must be added.
TVWIN calculation with Gap time:
1) CV...number of bits containing manchester code violations
Data Sheet
TVWIN
Incoming Pattern[bits] ... 0 0 1 0
TSIBstart
TVWIN without GAP
=
round max
TVWIN and TSIGAP dependency example
TSIGap TSIB Timing
TVWIN
CV
(
RunIn
{
TVWIN
(
(
8
+
TSIA
16 CV
⋅
=
S
round 8
1
_ _ _ _ _
+
TSIGAP=10 chips
2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
8
) 1.25
TSIA
(
⋅
(
62
TVWIN
+
1)
16 CV
number itself, the half bit before CV and
) 8
,
TVWIN with GAP
delay
(
⋅
int.
GapSync
0 0 0 0
+
16 TSIA
Start of TSIB
+
comparison
8
⋅
) 1.25
GAP
⋅
1 0 0 0 1 1 1 1 1
Functional Description
CV
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
)
+
TVWIN
TSIB
16 1 ⋅
TSIGRSYN = 1
V1.0, 2010-02-19
+
Stop of TSIB
RUNIN/
8
comparison
Figure
TDA5235
) 1.25
⋅
}
34.
)