DS90UB903QSQ Datasheet, PDF(29/45 Page) Texas Instruments – DS90UB903Q/DS90UB904Q 10 - 43MHz 18 Bit Color FPD-Link III Serializer and Deserializer

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DS90UB903QSQ Datasheet, PDF (29/45 Pages) Texas Instruments – DS90UB903Q/DS90UB904Q 10 - 43MHz 18 Bit Color FPD-Link III Serializer and Deserializer

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DS90UB903Q, DS90UB904Q

www.ti.com

SNLS332E â JUNE 2010 â REVISED APRIL 2013

AT-SPEED BIST (BISTEN, PASS)

An optional AT SPEED Built in Self Test (BIST) feature supports at speed testing of the high-speed serial and

the bidirectional 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 detected 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:

Serializer MODE = 0 and Deserializer MODE = 1

Apply power for Serializer and Deserializer

Normal

Step 1: Enable AT SPEED BIST by placing the

Deserializer in BIST by mode setting BISTEN = H

Step 4: Place System in

Normal Operating Mode

BISTEN = L

BIST Wait

Step 2: Deserializer will setup Serializer and enable BIST

mode through Bidirectional control channel

communication and then reacquire forward channel clock

BIST Start

Step 3: Stop AT SPEED BIST by turning off BIST

mode with BISTEN = L at the Deserializer.

BIST Stop

Figure 32. AT-SPEED BIST System Flow Diagram

Step 1: Place the Deserializer in BIST Mode.

Serializer and Deserializer power supply must be supplied. Enable the AT SPEED BIST mode on the

Deserializer by setting the BISTEN pin High. The 904 GPI[1:0] pins are used to select the PCLK frequency of the

on-chip oscillator for the BIST test on high speed data path.

Des GPI[1:0]

Table 5. BIST Oscillator Frequency Select

Oscillator Source

External PCLK

Internal

min (MHz)

typ (MHz)

12.5

max (MHz)

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