DS92LX1621_14 Datasheet, PDF(32/48 Page) Texas Instruments – 10 - 50 MHz DC-Balanced Channel Link III Serializer and Deserializer with Bi-Directional Control Channel

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DS92LX1621_14 Datasheet, PDF (32/48 Pages) Texas Instruments – 10 - 50 MHz DC-Balanced Channel Link III Serializer and Deserializer with Bi-Directional Control Channel

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DS92LX1621, DS92LX1622

SNLS327I â MAY 2010 â REVISED JANUARY 2014

www.ti.com

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 34. 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 DS92LX1622 GPIO[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 GPIO [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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Product Folder Links: DS92LX1621 DS92LX1622

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