THCV219_16 Datasheet, PDF (9/18 Pages) THine Electronics, Inc. – V-by-One HS High-speed Video Data Transmitter

Field BET Operation
In order to help users to check validity of CML high-speed serial line, THCV219 has an operation mode in
which they act as a bit error tester (BET). In this mode, THCV219 internally generates test pattern which is then
serialized onto the CML high-speed line. THCV220 which is an example or Rx device also has BET function
mode. THCV220 receives the data stream and checks bit errors.
This "Field BET" mode is activated by setting BET= H both on THCV219 andTHCV220. The generated data
pattern is then 8b/10b encoded, scrambled, and serialized onto the CML channel. As for THCV220, the internal
test pattern check circuit gets enabled and reports result on a certain pin named BETOUT. The BETOUT pin
goes LOW whenever bit errors occur, or it stays HIGH when there is no bit error. Please refer to Table 5.
Table 5. Field BET operation pin settings
THCV219
THCV220
Figure 5. Condition
Figure 6. BET Figure 7. BET
L
L
Normal Operation
H
H
Field BET Operation
Table 6. THCV220 Field BET result
BETOUT
Output
L
Bit error occurred
H
No error
TTL data inputs
are ignored
THCV219
THCV220
CLKIN
Test Pattern
Generator
Test Pattern
Checker
BET=H
BET=H
Figure 8. Field BET Configuration
BETOUT
Test Point
for
Field BET
THCV219_Rev.2.20_E
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