DS90UB903Q Datasheet, PDF (30/41 Pages) Texas Instruments – 10 - 43MHz 18 Bit Color FPD-Link III Serializer and Deserializer with Bidirectional Control Channel

Note: The user must verify that the timing variations between
the different links are within their system and timing specifi-
cations.
The maximum time (t1) between the rising edge of GPI/GPO
(i.e. sync signal) arriving at SER A and SER B is 25 us.
FIGURE 29. GPI/GPO Delta Latency
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GENERAL PURPOSE I/O (GPI/GPO)
The DS90UB903Q/904Q has up to 4 GPO and 4 GPI on the
Serializer and Deserializer respectively. The GPI/GPO max-
imum switching rate is up to 66 kHz for communication be-
tween Deserializer GPI to Serializer GPO.
AT-SPEED BIST (BISTEN, PASS)
An optional AT SPEED Built in Self Test (BIST) feature sup-
ports at speed testing of the high-speed serial and the bidi-
rectional control channel link. Control pins at the Deserializer
are used to enable the BIST test mode and allow the system
to initiate the test and set the duration. A HIGH on PASS pin
indicates that all payloads received during the test were error
free during the BIST duration test. A LOW on this pin at the
conclusion of the test indicates that one or more payloads
were detected with errors.
The BIST duration is defined by the width of BISTEN. BIST
starts when Deserializer LOCK goes HIGH and BISTEN is set
HIGH. BIST ends when BISTEN goes LOW. Any errors de-
tected after the BIST Duration are not included in PASS logic.
Note: AT-SPEED BIST is only available in the Camera mode
and not the Display mode
The following diagram shows how to perform system AT
SPEED BIST:
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