TLK10031: What's the low-speed side (MAC) interface in 1000BASE-KX mode?

Casey Nielson

Part Number: TLK10031

The datasheet lists XAUI for 10GBASE-KR low-speed interface, but doesn't specify what the single-lane low-speed interface should be for 1000BASE-KX. Would an SGMII link to an FPGA MAC be appropriate?

Thank you,

Casey

over 3 years ago

0 Rodrigo Natal over 3 years ago

TI__Mastermind 19185 points

Hi,

The details are included in the TLK10031 datasheet. See excerpt below. Low speed setting is 1.25Gbps half rate

Table 7-3. Specific Line Rate and Reference Clock Selection for the 1GBASE-KX Mode

LOW SPEED SIDE				HIGH SPEED SIDE
Line Rate (Mbps)	SERDES PLL Multiplier	Rate	REFCLKP/N (MHz)	Line Rate (Mbps (1) )	SERDES PLL Multiplier	Rate	REFCLKP/N (MHz)
3125 (2)	10	Full	156.25	3125 (2)	10	Full	156.25
3125 (2)	5	Full	312.5	3125 (2)	5	Full	312.5
1250	10	Half	125 (2)	1250	20	Quarter	125 (2)
1250	8	Half	156.25	1250	16	Quarter	156.25
1250	8	Quarter	312.5	1250	8	Quarter	312.5

Cordially,

Rodrigo Natal

HSSC Applications Engineer

0 Casey Nielson over 3 years ago in reply to Rodrigo Natal

Prodigy 40 points

Hi Rodrigo,

Thanks for the reply. We expect to use a REFCLK of 156.25 MHz and a low speed line rate of 1250 Mbps, but what is the protocol? For 10G it's XAUI. What is it for 1G?

Thank you,

Casey

0 Rodrigo Natal over 3 years ago in reply to Casey Nielson

TI__Mastermind 19185 points

1G-KX is 1.25Gbps 8B/10B encoded data interface across a backplane connection.

Regards,

Rodrigo Natal

0 Casey Nielson over 3 years ago in reply to Rodrigo Natal

Prodigy 40 points

That's the high-speed side of things, yes. I'm asking about the low-speed protocol between the phy and mac.

Thanks,

Casey

0 Rodrigo Natal over 3 years ago in reply to Casey Nielson

TI__Mastermind 19185 points

Data is 1G on both sides for KX

0 Casey Nielson over 3 years ago in reply to Rodrigo Natal

Prodigy 40 points

I understand that the low-speed side has a 1.25 Gbps line rate and is 8b/10b encoded. But what is the data protocol when the PHY is in 1G-KX mode? Is it still XAUI? Is it SGMII?

Thanks,

Casey

0 Rodrigo Natal over 3 years ago in reply to Casey Nielson

TI__Mastermind 19185 points

Standard 1G Ethernet in, Standard 1G Ethernet out. So SGMII I suppose.

Regards,

Rodrigo Natal

Interface

Interface forum

TLK10031: What's the low-speed side (MAC) interface in 1000BASE-KX mode?