DS250DF410: How to get PRBS bit error count more than 2047?

kailin zhao

Part Number: DS250DF410

Dear e2e:

The IC(DS250DF410) have PRBS counter register named PRBS_ERR_CNT,but the DAC is 11 bit,how should I do to get a error bit count more than 2047?

thank you

over 7 years ago

0 Nasser Mohammadi over 7 years ago

TI__Guru* 93670 points

Hi Kailin,
As you noted, error counter is 11-bits long. Once error counter reaches 0x3FF it gets frozen even though there could be more error. Un-freeze prbs error counter bit - 0x82[7]=1'b0 - resets and restarts the error counter.
Regards,,nasser

0 kailin zhao over 7 years ago in reply to Nasser Mohammadi

Intellectual 260 points

Hi nasser

when I frezze the error counter,the PRBS Generator is still running.For example,I spent 0.1 second to frezze the bit error counter and read it,there are more 400000000 bit escape from the error counter.How do I do to statistical the error bit accurately.

thanks.
zhao kailin

0 Nasser Mohammadi over 7 years ago in reply to kailin zhao

TI__Guru* 93670 points

Hi Kailin,

I believe you have to do some type of averaging. For example, un-freeze and within a certain fixed time read the error counter. Then do this multiple times and then average.

Regards,,nasser

0 kailin zhao over 7 years ago in reply to Nasser Mohammadi

Intellectual 260 points

Hi nasser

How to read the total bits and the error bits?

thank you

0 Nasser Mohammadi over 7 years ago in reply to kailin zhao

TI__Guru* 93670 points

Hi Kailin,

Please note E2E thread below. This thread discussed how to setup the registers and read error counter(reg 0x82, 0x83, 0x84)..

https://e2e.ti.com/support/interface/ethernet/f/903/t/701766?tisearch=e2e-sitesearch&keymatch=faq

Regards,,nasser

0 kailin zhao over 7 years ago in reply to Nasser Mohammadi

Intellectual 260 points

Hi nasser

I found anather question.The DS show that" The pattern checker uses 32- bit words, but every bit in the word is checked for error, so the error count represents the count of single bit errors" what does that mean?

thank you

0 Nasser Mohammadi over 7 years ago in reply to kailin zhao

TI__Guru* 93670 points

Hi Kailin,

Since PRBS generator/checker can use PRBS31, this means device uses 32-bits word for PRBS pattern generator/checker. If there is one bit error in this 32-bits word then this is counted as one error. Or if there is multiple bit errors - for example 7-bits error - within this 32-bits then it is counted as multiple or for example 7 errors.

Regards,,nasser

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DS250DF410: How to get PRBS bit error count more than 2047?