Problem in configure LXT972A for GMII

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varun_agr

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sir
I am tring to trnasmitting data from virtex2pro kit to my laptop with Tri-mode ethernet mac 3.5.i with GMII 10/100 mbps in ISE 10.1.I am using wireshark to capture the frames. But I am facing problem as
1.Is it necessarily to use management configuration for xilinx virtex2pro board LXT972A(U12) IEEE 802.3- complaint Fast ethernet physical layer(PHY). Can we use configuration vector (given in user guide ) in place of management configuration i.e.tieemacconfigvec 67 downto 0.
2. Can we use without clock enable? I am generating txcoreclk i.e. 12.5 Mhz from system clock. But tx_clock i.e. given in virtex2pro ucf is not coming from phy , why it so?
3. As given in transmission section timing diagram clientemactxd is 7 down to 0 and in virtex2pro we r using 4 bit and upper nibble should be zero. Then if my mac id is 25-18-3e-27-14-02 then we should give 00-02-01-04-02-07-03-0e-01-08-02-05 (Left to right )or I am giving address in wrong way.
Sir I tried to transmit data without management configuration with/without clock and without address filter with GMII 100. But I am unable to receive any data in my wireshark. I tried with cross cable and also with hub.
When I do self test of board the ethernet light status are glowing but when I use my programme nothing as in wireshark link disconnected shown.
I also tried with management configuration with hostclk=100Mhz,txgiimgiiclk=25 Mhz(as 100 Mbs),MDC= 2.38Mhz but facing same problem as not getting TX_CLOCK from PHY.
Sir kindly reply me with the solution.
 

Hi,
Autonegotiation of almost PHY is active at power on so don't worry about configuration.If you are going to use 100Mb or equally host link is 10/100 your receive and transmit clocks are 25MHz(100/4) not 12.5MHz.Wireshark can capture any packet with any MAC Address so your mac address is not important.I hope this hint be useful.
Regards
 

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