THCV220_16 Datasheet, PDF (9/18 Pages) THine Electronics, Inc. – THCV220 is designed to support video data transmission between the host and display.

Field BET Operation
In order to help users to check validity of CML high-speed serial line, THCV220 has an operation mode in
which they act as a bit error tester (BET). THCV219 which is an example of Tx device also has BET function
mode. In this mode, THCV219 internally generates test pattern which is then serialized onto the CML
high-speed line. THCV220 receives the data stream and checks bit errors.
This "Field BET" mode is activated by setting BET= H both on THCV219 and THCV220. 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 BETOUT pin. The BETOUT pin goes LOW
whenever bit errors occur, or it stays HIGH when there is no bit error. Please refer to Table 6. User can select
two kinds of check result, “Latched-result” or “NOT latched result”. The latch is reset by setting LATEN=L.
THCV219
BET
L
H
H
Table 6. Field BET operation pin settings
THCV220
Condition
BET
LATEN
Operation
Output Latch select
L
Normal Operation
-
L
H
Forbidden
-
H
L
NOT latched result
Field BET Operation
H
H
Latched result
Table 7. 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 5. Field BET Configuration
LATEN
BETOUT
Test Point
for
Field BET
THCV220_Rev.2.20_E
Copyright©2016 THine Electronics, Inc.
9/18
THine Electronics, Inc.
Security E