DS90UB921-Q1 Datasheet, PDF (18/57 Pages) Texas Instruments – 5 - 96 MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel

DS90UB921-Q1
SNLS488 – MARCH 2016
Feature Description (continued)
Enable
Set reg_0x01[7]=1
Back Channel IDLE
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Normal Operation
Remote Auto Power
Down Enabled
Forward-channel
OFF
Sleep
Disable
Set reg_0x01[7]=0
Back Channel ACTIVE
Figure 15. Remote Auto Power Down Sleep/Wake Cycle
To resume normal operation, the Remote Auto Power Down feature must be disabled in the device control
register. This may be accomplished from a local I²C controller by writing reg_0x01[7]=0 (Table 7). To disable
from a remote I²C controller located at the deserializer, perform the following procedure to complete the wake-up
process:
1. Power up remote deserializer (back channel must be active)
2. Enable I²C PASS-THROUGH ALL by setting deserializer register reg_0x05[7]=1
3. Enable I²C AUTO ACK by setting deserializer register reg_0x03[2]=1
4. Disable Remote Auto Power Down by setting serializer register reg_0x01[7]=0
5. Disable I²C AUTO ACK by setting deserializer register reg_0x03[2]=0
6. Disable I²C PASS-THROUGH ALL by setting deserializer register reg_0x05[7]=0
7.3.9 Input PCLK Loss Detect
The serializer can be programmed to enter a low power SLEEP state when the input clock (PCLK) is lost. This is
done via register 0x03[1] (see Table 7). A clock loss condition is detected when PCLK drops below
approximately 1MHz. When a PCLK is detected again, the serializer will then lock to the incoming PCLK. Note –
when PCLK is lost, the Serial Control Bus Registers values are still RETAINED.
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