DS90UB903QSQ/NOPB National Semiconductor, DS90UB903QSQ/NOPB Datasheet - Page 30

• Manufacturer Part Number: DS90UB903QSQ/NOPB
• Description: IC SER/DESER 10-43MHZ 18B 40LLP
• Manufacturer: National Semiconductor

Specifications of DS90UB903QSQ/NOPB

• Function: Serializer
• Data Rate: 900Mbps
• Input Type: LVCMOS
• Output Type: CML
• Number Of Inputs: 1
• Number Of Outputs: 1
• Voltage - Supply: 1.71 V ~ 1.89 V, 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Note: The user must verify that the timing variations between
the different links are within their system and timing specifi-
cations.
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
FIGURE 29. GPI/GPO Delta Latency
30
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.
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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