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Adventurer
Adventurer
452 Views
Registered: ‎07-02-2014

info related to Clock connection between 1G PCS/PMA SGMII IP Core and MAC

Hi all, 

 

i am presently trying to interface custom MAC to PCS/PMA IP core, i am using VCU118 kit i have few doubts can anyone please clarify. 

 

PCS/PMA ip core is configured as 1G, SGMII,  drp clk = 50.0, reference clock, transceiver refference clk = 125 mhz, 

Rx GMII clk src=RXOUTCLK. Device specific Transceiver.

 

i have to connect the following clocks to the MAC.

         clk_mac_tx   ( should be 125MHz for gigabit operation
                                                 25MHz for 100M operation
                                                 2.5MHz for 10M operation)

         clk_mac_rx ( should be 125MHz for gigabit operation
                                                 25MHz for 100M operation
                                                 2.5MHz for 10M operation)

         clk_mac_gtx   (should be 125 mhz fixed)

 

please find attached clocks comming out from the core

 

in my design i have given like this

assign clk_mac_tx  = sgmii_clk_r;

assign clk_mac_rx = sgmii_rx_clk_r;

assign clk_mac_gtx = userclk2_out;

 

am i doing any mistake ?? please let me know

 

 

 

user_clks.PNG
sgmii_clks.PNG
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3 Replies
Adventurer
Adventurer
451 Views
Registered: ‎07-02-2014

Re: info related to Clock connection between 1G PCS/PMA SGMII IP Core and MAC

 
gtx_xlk.PNG
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Moderator
Moderator
399 Views
Registered: ‎08-25-2009

Re: info related to Clock connection between 1G PCS/PMA SGMII IP Core and MAC

Hi @mdakram140,

 

The best example/reference you can find is to generate the AXI Ethernet Subsystem IP for VCU118, which has the SGMII and MAC underneath.

"Don't forget to reply, kudo and accept as solution."
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Adventurer
Adventurer
393 Views
Registered: ‎07-02-2014

Re: info related to Clock connection between 1G PCS/PMA SGMII IP Core and MAC

the eample design has sgmii core with lvds interface but i am using sgmii core as gmii to sgmii converter .

 

should i choose RXOUTCLK or TXOUTCLOCK in GUI ??

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