TLK10232 10G transmit

Hi, Luis.

I suppose you right, but I connected RX channel A and TX channel B.
Made a XAUI loop in FPGA.
I see receiving packets but no transmit on sfp.
Is any workaround? It looks like TX doesn't work without Link ON on RX.
I've made changes on working card with regular RX/TX pair connections.

Yuli

Hi Yuli,

Could you clarify your setup? Are you setting the TLK10232 in loopback mode? Also what is the value for 0x1E.000B register?

Thanks,
Luis

Hi, Luis.

Not actually loopback. I'm transmitting via channel A and receiving on ch B at the same chip.
I'm using internal switch to make "loopback"
Write 0x3300 to register 0x17 of ch A.
I also have errors on HS receive. SFP+ is placed pretty close (1") to TI chip.
Can it cause the problem?

Thanks,
Yuli

Hi Yuli,

If you want to use the internal data switch feature:

Wirte 0x3800 to register 0x1E.0017 to select alternate channel LS input (Channel B). Doing this, the input will come from LS (Channel A) and will switch to HS (Channel B). Dataflow is as follows:

Best Regards,

Luis

Hi, Luis.

I'm working like this:

Rest of interfaces are unconnected

I see receive on LS side ch B (green), but no transmit on HS ch. A (red)

Yuli

Yuli,

Please write 0x2000 to 0x1E.0017 to set the device in normal operation (without data-switch). Then connect with a cable the HSTXA to HSRXB. Doing this, you should see data on HSTXA & HSRXB.

Thanks,
Luis

Hi, Luis.

I've connected RxA to TxB like on picture.

and made register setup below:

write_phy 0 1E 0000 8610
write_phy 1 1E 0000 8610
write_phy 0 1E 0005 c000
write_phy 1 1E 0005 c000
write_phy 0 1E 0001 0b00
write_phy 1 1E 0001 0b00
write_phy 0 07 0000 2000
write_phy 1 07 0000 2000
write_phy 0 01 0096 0000
write_phy 1 01 0096 0000
write_phy 0 1E 8020 03ff
write_phy 1 1E 8020 03ff
write_phy 0 1E 0004 0560
write_phy 1 1E 0004 0560
write_phy 0 1E 000e 0008
write_phy 1 1E 000e 0008

But still have no transmit.

Only tx (loop) I have when set register 0x0017 to 0x3300

Thanks,

Yuli

Hi, Luis.

I 've made some experiment with other design and bring it to the same configuration as new one.

I've unconnected unnecessary XAUI and HS side.

Fortunately it is working.

I'm confused. And cannot understand what is the difference between two designs except of 

different layout. I logged dump of all PHY registers.

Only difference I found is:

	New		Old
10010001	82	00010001	2
10010008	b400	00010008	b000
10018010	17	00018010	0
10018011	26	00018011	0
10018012	12	00018012	0
10018013	0	00018013	0
10038010	00ff	00038010	0
101e000f	7213	001e000f	7003
101e0015	c149	001e0015	c146
101e001b	1323	001e001b	1320
11030021	bfff	01030021	8000
111e000f	1d03	011e000f	1c03
111e0010	00ff	011e0010	0
111e0015	8c07	011e0015	8c02
111e0016	f009	011e0016	f031

In new design receive pass is working. I see number of errors bun NO High BER

Thanks in advance,

Yuli

Hi, Luis.

Thanks for your help.

I found the problem - XAUI was connected wrong.

Anyway, the lane alignment bit show correct alignment.

This was confused me.

Best Regards,

Yuli

Great!

Please let me know if you have further questions.

Regards,

Luis