Datasheet

LP
Priority
HPD_A
0
1
0
1
0
1
HPD_B
0
1
HPD_OUT
0
1
Channel A
Z
0
1
ChannelB
0
1
HI-Z
DATA
LP
Priority
HPD_A
0
1
0
1
0
1
HPD_B
0
1
HPD_OUT
0
1
Channel A
Z
0
1
ChannelB
0
1
HI-Z
DATA HI-Z
DATA
SN75DP122A
SLLS939 – NOVEMBER 2008 ............................................................................................................................................................................................ www.ti.com
Figure 45.
– Case two: In this case both HPD inputs are HIGH. Changing the state of the priority pin when both HPD
inputs are high forces the device to switch which channel is selected. When a state change is detected on
the priority pin, the device waits for a short period of time t
T1(HPD)
before responding (see Figure 46 ). The
purpose for this pause is to allow for the priority signal to settle and also to allow the device to ignore
potential glitches on the priority pin. Once t
T1(HPD)
has expired, the HPD output is forced LOW for t
T2(HPD)
and the device follows the chain of events outlined in scenario 3 case 2.
Figure 46.
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