cbtl12131 NXP Semiconductors, cbtl12131 Datasheet - Page 17

• Manufacturer Part Number: cbtl12131
• Description: Cbtl12131 Displayport Multiplexer For Bidirectional Video In All-in-one Computer Systems
• Manufacturer: NXP Semiconductors

Table 10.
Legend: high-Z = isolating, high-impedance; ACT = active, nominal-impedance.
[1]
[2]
[3]
[4]
[5]
PATH_SEL
HPD_B_FLT is an internally derived signal, not an input to CBTL12131. HPD_B_FLT will follow input HPD_B.
System controller will assert AUX_TERM_SNK HIGH when user action prompts a ‘toggle’, hence system should configure itself as a sink.
System controller will assert AUX_TERM_SRC HIGH when it has determined that a Sink is connected, hence system should configure itself as a source.
System controller should guarantee that (AUX_TERM_SNK & AUX_TERM_SRC) is never TRUE for normal operation unless the external termination resistors are used.
AUX_TERM_SRC and AUX_TERM_SNK = TRUE are used as a disable mechanism for the integrated AUX bias network when external termination resistors are used.
0
0
0
0
0
0
0
0
1
AUX channel bias and termination
HPD_B_FLT
[1]
X
0
0
0
0
1
1
1
1
Inputs
AUX_TERM
_SRC
X
0
0
1
1
0
0
1
1
AUX_TERM
_SNK
0
1
0
1
0
1
0
1
X
RAUX100P RAUX100N RAUX500P
high-Z
high-Z
high-Z
high-Z
high-Z
ACT
ACT
ACT
ACT
high-Z
high-Z
high-Z
high-Z
high-Z
ACT
ACT
ACT
ACT
AUX terminations
high-Z
high-Z
high-Z
high-Z
high-Z
high-Z
high-Z
high-Z
ACT
RAUX4M7P RAUX4M7N
high-Z
high-Z
high-Z
high-Z
high-Z
high-Z
high-Z
high-Z
ACT
high-Z
high-Z
high-Z
high-Z
high-Z
high-Z
high-Z
ACT
ACT
Comments
Nothing connected.
Override in scenario of two
systems both using
CBTL12131 connected
together.
Allow sink to perform source
detection.
[4][5]
Dual display mode -
normal condition.
Not an expected condition.
Already in dual display mode
with source termination
active.
Not an expected condition.
Already in dual display mode
with source termination
active.
[4][5]
Internal display expected to
exhibit 1 M
pull-down, hence no
termination needed.
[2]
[3]
Ω
pull-up and