• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 46 subscribers
  • Views 267 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

What Exactly is the Alternating 0/1 Pattern?

Nathan Choi
Prodigy 50 points
Other Parts Discussed in Thread: DAC39J82

Hi,

I'm bringing up DAC39J82 device.

Since I've got PLLs locked, SERDES LOS is cleared, FIFO alarms are gone, I want to check the pattern test.

I want to start with the alternating 0/1 pattern(TESTPATT set to 001).

What exactly is the alternating 0/1 pattern?

Is it like 0x0000, 0xFFFF, 0x0000, 0xFFFF,... ?

or 0x0000, 0x0001, 0x0000, 0x0001,..

or 0xAAAA, 0x5555,....

  • 0
    TI__Guru 66054 points
    Hi Nathan,

    This is a simple 01010101 toggle pattern similar to the bit clock. We also have other patterns such as PRBS to check for more random toggles.

    Keep in mind that these are at the physical layer level (transmitter and receiver circuitry before 8b/10). There are JESD level pattern checkers as well (after you establishes the link)

    -Kang