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Indicators and Test points
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Table 3-3 below describes function of switch S1 in more detail.
Table 3-3. Switch S1 Functions
Description
Switch
Control
position
I2C Disabled (ISEL/RST= LOW) I2C Enabled (ISEL/RST= HIGH)
When De-skew mode is disabled (DKEN=
Acts as 3 LSBs of the 7 bit I2C address of
LOW), CTL2 & CTL1 can be used to send
TFP410,
additional information across the DVI link
A[3:1]=000 to select 7 bit I2C address as 0x38
during blanking interval (DE= LOW).
S1.10 CTL3
through
S1.9 CTL2
When De-skew mode is enabled (DKEN=
A[3:1]=111 for 0x3F.
S1.8 CTL1
HIGH), these 3 inputs become DK[3:1], used Based on read or write operation 1 or 0 is
to adjust the setup and hold times of the
appended to form the 8 bit I2C address, refer
pixel data inputs relative to IDCK+. Refer
device datasheet for more details.
device datasheet for more details.
HIGH : Primary latch occurs on the rising
edge of IDCK+
Used to monitor the hot plug detect signal.
LOW : Primary latch occurs on the falling Make sure that R4 is mounted, R13 is not
S1.7 EDGE/HTPLG
edge of IDCK+ mounted and S1.7 is set HIGH for the
Make sure that R13 is mounted and R4 is operation.
not mounted for the operation.
S1.6 ISEL/RST LOW : I2C disabled HIGH : I2C enabled
Depends upon VREF and BSEL, refer This switch should be positioned high for the
S1.5 DSEL/SDA
TFP410 device datasheet. external pull up on SDA line.
HIGH : selects 24-bit input, single ended
input mode.
This switch should be positioned high for the
S1.4 BSEL/SCL
LOW : selects 12-bit input, dual edge input external pull up on SCL line.
mode.
HIGH : Enables de-skew with the trim
increment selected through S1.10, S1.9,
This pin should be tied either to GND or to
S1.3 DKEN S1.8 VDD and avoid floating input. De-skew function
LOW : Disables de-skew and default trim can be accessed through I2C.
setting is used
S1.2 Not used - -
In this mode, PD pin should be tied to GND.
HIGH : Normal operating mode
S1.1 PD Power down state is selected through I2C and
LOW : Power down mode
default mode is Power down.
3.5 Indicators and Test points
Table 3-4. Description : Indicators and Test points
Reference Description
D1 3.3V LDO supply indicator : Green LED
Hot plug detect / Edge Select : Red LED
• By default (I2C disabled on TFP410), it will indicate the status of the input clock (IDCK+) edge
selected (though S1.7) for primary latch on TFP410,
D2 HIGH : Rising edge
TP1 LOW : Falling edge (default)
Make sure that R13 is mounted and R4 is not mounted for the operation.
• When I2C enabled, it indicates hot plug detect signal status.
Make sure that R4 is mounted, R13 is not mounted and S1.7 is set high for the operation.
TP2 HDMI CEC pin test point
TP3 Programming time control output of U3
Monitor sense/ programmable output of TFP410
• When I2C is disabled,
HIGH level on this pin indicates a receiver is detected at the differential outputs,
TP4
Low level indicates a power on receiver is not detected
• When I2C is enabled, this output is programmable through I2C interface, refer TFP410 device
datasheet for more details.
8 Evaluation Hardware Overview SNLU144 – may 2013
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