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idata
Community Manager
1,497 Views

Intel I210: Synchronized Output Clock on SDP Pins

Hi,

I am not sure if this is the right place to post this question, if not please correct me.

I am using an Intel I210 card on my linux PC. I was trying to generate a clock output on one of the SDP pins, so I followed the section-7.8.3.3.3 in Intel-i210 data sheet.

According to Time Sync Interrupt Cause Register(TSICR) description, we can get interrupts to driver for "every output clock half-cycle on SDP pin". So I configured the registers accordingly from the "igb_avb driver" (few changes to original driver in Open-AVB).

The problem is, I am not getting those clock interrupts. Basically what I was looking for is, to get periodic interrupts from the SDP clock to igb_avb driver, to perform some tasks.

Have someone tried this before ?

Registers I configured (for CLK1 on SDP1) are:

IMS - set Time sync interrupts

TSIM - enable interrupt for Target Time1(TT1)

TSSDP - enable SDP1 and assign CLK1

TSAUXC - enable CLK1

CTRL - set SDP as output

FREQOUT - set clock half-cycle

Please let me know if any more information is required.

Thanks.

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5 Replies
idata
Community Manager
77 Views

Hi Shiva_Kumar,

 

 

Thank you for the post. I will have to check on this inquiry.

 

 

Thanks,

 

wb

 

 

idata
Community Manager
77 Views

Hi Shiva_Kumar,

 

 

Good day. Can you help clarify if you are actually getting clock pulses of the pin?

 

 

Can you also provide the scope shot of the pulse? Thanks.

 

 

Rgds,

 

wb

 

 

idata
Community Manager
77 Views

Hi Shiva_Kumar,

 

 

Please feel free to provide the information.

 

 

rgds,

 

wb

 

idata
Community Manager
77 Views

Hi,

I didn't probe the SDP pin with a scope. But I was reading the "SDP1 DATA" bit periodically in "Device Control Register - CTRL" to check if there are any pulses.

Not sure if it is the right method, but I could see the level change with period read operations. But there were no interrupts to the driver.

I am not sure if I can provide a shot on scope, but I'll try.

Thanks,

Shiva

idata
Community Manager
77 Views

Hi Shiva,

 

 

Thank you. Please feel free to provide in case you are able to capture the data.

 

 

rgds,

 

wb