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Participant amistad
Participant
4,418 Views
Registered: ‎09-28-2012

Implement CPRI by the SFP+ connector on KC-705

Hi All,

I followed the document (PG053) and generated a CPRI of 6.25 Gbps by core generator.

 

It works if connected by SMA as the document illustrate.

 

However, when I tried change the GTP from SMA connectors to SFP+ connectors by changing the ucf file as the following:

 

original: INST "cpri_block_i/gt_and_clocks_i/gtwizard_i/gt0_gtwizard_i/gtxe2_i" LOC = "GTXE2_CHANNEL_X0Y8";

 

modified: INST "cpri_block_i/gt_and_clocks_i/gtwizard_i/gt0_gtwizard_i/gtxe2_i" LOC = "GTXE2_CHANNEL_X0Y10";

 

The generated bit stream is not work and the indicator shows the clock seems some problems. (plz refer to the attachment) I checked and verified the connection of the X0Y10 instance, it shares the same clock with X0Y8 in another example.

 

Is there something I missed? 

 

Thanks in advance 

Best Regards 

Amistad

 

normal indicator 

cpri_norm_ind.png

 

Abnormal indicator

cpri_abnorm_ind.png

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5 Replies
Scholar austin
Scholar
4,408 Views
Registered: ‎02-27-2008

Re: Implement CPRI by the SFP+ connector on KC-705

a,

 

Just moving to another GTP means that all the wires to and from it must be re-routed.

 

Are there any warnings or errors in teh timing report?  Any warnings or errors in any report?

 

How do you test that "it works?"

 

 



Austin Lesea
Principal Engineer
Xilinx San Jose
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Participant amistad
Participant
4,389 Views
Registered: ‎09-28-2012

Re: Implement CPRI by the SFP+ connector on KC-705

Hi Austin,

the timing report shows no violation in timing constraint and no error but some warnings almost as the same

as SMA connector. 

 

The test method is to utilize the chipscope instances in the example by Analysis. 

 

some events listed as the following indicate the IP works correctly or not

 

normal work:

1. no alarm

2. "clk_ok" is stable

3. CPRI rate is stable 

4. the byte count is increasing

5. no IQ error

 

abnormal work:

1. alarms (L1 sync error)

2. "clk_ok" is unstable (high/low changing)

3. CPRI rate is unstable (negotiating)

4. the byte count is zero

 

The project files are included in the attachment, "cpri_3GM.rar."

 

\ISE: assign GTP to SMA connector 

\ISE1: assign GTP to SFP connector

 

Best Regards 

Amistad

 

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Participant amistad
Participant
4,388 Views
Registered: ‎09-28-2012

Re: Implement CPRI by the SFP+ connector on KC-705

 
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Participant amistad
Participant
4,387 Views
Registered: ‎09-28-2012

Re: Implement CPRI by the SFP+ connector on KC-705

 
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Participant amistad
Participant
4,386 Views
Registered: ‎09-28-2012

Re: Implement CPRI by the SFP+ connector on KC-705

 
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