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Part Number: DS250DF230
I'm using DS250DF230 in the design, and I'm doing the PRBS test. The link under test is like this:
Retimer -> SFP -> CABLE -> SFP -> Retimer
I want to use one retimer to generate PRBS, and use the other one to check PRBS. But after I configured the registers, there're no signal detected. My configuration sequence is shown below:
Referenced from Programmer's guide(SNLU182D)
0xff 0x030x00 0x040x0a 0x0c0x60 0x900x61 0xb30x62 0x900x63 0xb30x64 0xff0x09 0x040x18 0x100x1e 0xe10x31 0x400x0a 0x00
Enable generator: 0x2e 0x040x30 0x010x1e 0xf10x79 0x100x79 0x300x30 0x010x30 0x090xa5 0x80Enable checker:
0x0d 0x000x79 0x500x30 0x000x30 0x080x30 0x180x30 0x080x82 0x400x82 0x00
Any advice will be appreciated, thanks!
The TI retimer implements a reference-less CDR architecture. As such, some valid input signal must be present at the retimer input to be able to generate PRBS pattern. This input pattern is needed to lock the retimer channel CDR to the desired frequency. This reference input signal may be a 1010 clock pattern of a frequency that is a sub-rate of the full rate, and the frequency divide ratio may be as large as 16. For example, to generate 25.78125Gbps PRBS pattern from a retimer channel a 805.664062MHz square wave/sinusoidal signal may be used as the retimer reference input signal.
HSSC Applications Engineer
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In reply to Rodrigo Natal:
Thanks a lot! Problem solved! After I give the retimer a signal input, it achieved CDR lock, and it can generate PRBS signal now.
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