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TLK10232EVM: No link on SFP+

Yossi Aharon1
Prodigy 210 points
Part Number: TLK10232EVM
Other Parts Discussed in Thread: TLK10232

Tool/software:

Hello,

I'm working with the TLK10232EVM.

I would like to work in a XAUI to SFP+ at 10Gbps.

I configured the TLK10232 as follow using the "low level configuration" option in the GUI:

  1. Reset device (write a 1 to 0x1E.0000 bit 15 or assert RESET_N pin)
  2. Make sure the reference clock selection (156.25 MHz or 312.5 MHz) is correct – this is done through register 0x1E.001D bit 12 (default is 156.25 MHz)
  3. Disable auto-negotiation by writing 1’b0 to 0x07.0000 bit 12
  4. Disable link training by writing 16’h0000 to 0x01.0096
  5. Write 16’h03FF to 0x1E.8020.  This allows the link settings that would normally be configured through KR training to be configured manually instead.
  6. Depending on the link conditions, you may need to change the default configuration of 0x1E.0003 and 0x1E.0004.  For optical connections, we typically recommend changing HS_ENTRACK (0x1E.0004 bit 15) to 1’b1 and HS_EQPRE (0x1E.0004 bits 14:12) to 3’b101.  This can be a starting point, but you may need to do some BER testing to optimize the values.
  7. Issue a data path reset by writing 1’b1 to 0x1E.000E bit 3.

I'm connecting to the SFP+ of the EVB to "Digital Lightwave" test equipment in 10Gbs Ethernet mode.

When the trasmit of the test equipment is "Off" the test equipment has receives signal from the EVM and the test equipment report link OK. (I need to invert the transmit on the EVM).

When I turn "On" the laser of the test equipment to transmit a signal from the test equipment to the EVM the test equipment report no link and "code" errors. it seems like the EVM is sending back errors that it received.

The "PMA Sts" tab on the TLK EVM report "Signal Detected on RX Pins" but there is no link, also the lights of the "Fault condition detected" are light-up for both TX and RX.

The problem also happen if I do optical loopback on the SFP+ of the EVM using the SFP+ fiber.

When I perform loopback on the SMAs connector of channel "B" I see "receive Link is Up" on the PMA Sts tab of the EVM.

  1. Why can't I establish link on the SFP+ on the receive side?
  2. Am I missing a configuration?
  3. I tried the receiver equalizer setting with different values and also the "ENTRACK" but nothing is working.
  4. I wrote 0x2012 to 0x1E.0x0017 to force loopback on the HS.
  5. Is there a problem or wrong configuration of the HS PCS?

Regards,

Yossi