ADS54J66: mode Test Patterns

philippe bignet

Part Number: ADS54J66

Nous voudrions utiliser le mode Test Patterns pour un test automatique de l'ADS54J66.
Le type de pattern utiisé est le mode 0100 = Output digital ramp: output data increment by one LSB every clock cycle from code 0 to 16384

Nous rencontrons des problèmes de fonctionnement.

La rampe est incrémentée de 1 tous les 4 échantillons.

La rampe passe d'environ 8150 (notre exemple 8137) à 8192 (-8192 en signé exemple ci dessous)

La rampe reste bloquée vers 8192 pendant environ 200 échantillons (8192 - 8138 = 54 *4 échantillons/incrément = 216 échantillons ?)

Puis la rampe redémarre
Ce phénomène se reproduit sur les 3 cartes que nous avons.
Pouvez vous nous aider à résoudre ce problème (mauvaise configuration ou problème composant?)

over 7 years ago

0 jim s over 7 years ago

TI__Guru* 91947 points

Philippe,

When using test pattern modes, you need to disable the interleave engine by writing a 0x03 to address 0x18 of page 0x6100. Attached are the results of the pattern with this enabled and disabled. With the IL engine disabled, it appears the 2nd LSB has a pattern but it is not a typical pattern one would see with a ramp. I am checking with the design team regarding this.

Regards,

Jim

ADS54J66_ramp_test_Mode_8.pptx

0 jim s over 7 years ago in reply to jim s

TI__Guru* 91947 points

Philippe,

I was informed the ramp only uses 14 bits so you need to ignore the 2 LSB's.

Regards,

Jim

0 philippe bignet over 7 years ago in reply to jim s

Prodigy 30 points

Hi,

Thanks for the fast response.

First of all, we have activated the counter pattern without any problems. As you said the counter is only on the 14MSBs bits. We have already ignored the 2 LSBs bits.

The problem we have is that (as you can see on the pictures) the counter increase up to 8137 (0x1FC9) then jump to -8192 (aka 8192 : 0x2000) and stay at this value for 220 samples ((8192-8137)*4) and then restart the incrementation.

We are on a Xilinx Kintex Ultrascale and when we look at the RAW values that leave the JESD IP with an Integrated Logic Analyzer (ILA) on Vivado, we can see the same issue.

Do you have any ideas.

Regards

0 jim s over 7 years ago in reply to philippe bignet

TI__Guru* 91947 points

Philippe,

Do you see this when you disable the interleave engine by writing a 0x03 to address 0x18 of page 0x6100?

Regards,

Jim

0 philippe bignet over 7 years ago in reply to jim s

Prodigy 30 points

Jim,

The interleave engine is disabled

I enclose you some of our code

Regards,

Philippe

	// Write Device configuration
        // ADS54Jxx_ANALOG
        data.push_back(static_cast<uint32_t>(0x000081));


        // ADS54Jxx_DIGITAL
        data.push_back(static_cast<uint32_t>(0x400468));    // Selects Main digital Page (0x6800)
        data.push_back(static_cast<uint32_t>(0x400300));

        data.push_back(static_cast<uint32_t>(0x60f701));    // digital top reset
        data.push_back(static_cast<uint32_t>(0x60f700));    // digital top reset
        data.push_back(static_cast<uint32_t>(0x70f701));    // digital top reset
        data.push_back(static_cast<uint32_t>(0x70f700));    // digital top reset

        data.push_back(static_cast<uint32_t>(0x001180));    // Selects Master Page (0x80)
        data.push_back(static_cast<uint32_t>(0x005380));    // CLK Div divide by 2
        data.push_back(static_cast<uint32_t>(0x0039C0));    // Always write 1
        data.push_back(static_cast<uint32_t>(0x005920));    // Always write 1

        data.push_back(static_cast<uint32_t>(0x600001));    // reset digital channel A & B
        data.push_back(static_cast<uint32_t>(0x600000));    // clear reset
        data.push_back(static_cast<uint32_t>(0x700001));    // reset digital channel C & D
        data.push_back(static_cast<uint32_t>(0x700000));    // clear reset

        data.push_back(static_cast<uint32_t>(0x400461));    // Selects Decimation filter Page (0x6141)
        data.push_back(static_cast<uint32_t>(0x400341));
        data.push_back(static_cast<uint32_t>(0x600008));    // dec filter page mode 8
        data.push_back(static_cast<uint32_t>(0x700008));    // dec filter page mode 8
        data.push_back(static_cast<uint32_t>(0x600104));    // Always write 1
        data.push_back(static_cast<uint32_t>(0x700104));    // Always write 1

        data.push_back(static_cast<uint32_t>(0x40046A));    // Selects JESD analog Page (0x6A00)
        data.push_back(static_cast<uint32_t>(0x400300));
        data.push_back(static_cast<uint32_t>(0x601602));    // Set mode x40
        data.push_back(static_cast<uint32_t>(0x701602));

        data.push_back(static_cast<uint32_t>(0x400469));    // Selects JESD Digital Page (0x6900)
        data.push_back(static_cast<uint32_t>(0x400300));

        data.push_back(static_cast<uint32_t>(0x600020));    // set control mode
        data.push_back(static_cast<uint32_t>(0x600101));    // JESD dig 20X
        data.push_back(static_cast<uint32_t>(0x700020));    // set control mode
        data.push_back(static_cast<uint32_t>(0x700101));    // JESD dig 20X

        data.push_back(static_cast<uint32_t>(0x600080));    // set CTRL K
        data.push_back(static_cast<uint32_t>(0x60060F));    // set K to 16
        data.push_back(static_cast<uint32_t>(0x700080));    // set CTRL K
        data.push_back(static_cast<uint32_t>(0x70060F));    // set K to 16

        data.push_back(static_cast<uint32_t>(0x400501));    // Disable Broadcast
        data.push_back(static_cast<uint32_t>(0x700121));    // JESD dig 20X + SyncbAB ???    //0x700101));    // JESD dig 20X
        data.push_back(static_cast<uint32_t>(0x400500));    // Enable Broadcast

        data.push_back(static_cast<uint32_t>(0x400461));    // Selects Page (0x6100)
        data.push_back(static_cast<uint32_t>(0x400300));
        data.push_back(static_cast<uint32_t>(0x606806));    // Disable DC offset correction
        data.push_back(static_cast<uint32_t>(0x706806));    // Disable DC offset correction

        data.push_back(static_cast<uint32_t>(0x401803));    // Interleaving bypass
        data.push_back(static_cast<uint32_t>(0x00110F));    // Selects ADC Page (0x0F)
        data.push_back(static_cast<uint32_t>(0x0075FF));    // Pattern 1 MSB
        data.push_back(static_cast<uint32_t>(0x0076FC));    // Pattern 1 LSB
        data.push_back(static_cast<uint32_t>(0x007700));    // Pattern 2 MSB
        data.push_back(static_cast<uint32_t>(0x007800));    // Pattern 2 LSB
        data.push_back(static_cast<uint32_t>(0x007440));    // Test Mode Counter

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ADS54J66: mode Test Patterns