tri-mode eth MAC signals

[WachaG]

Dear developers and group members,

I am trying to use the Opencores tri-mode ethernet MAC core in my
student project (implementing a BPF in an FPGA). From the
specification I am not sure what some of the signals are meaning:

Rx_mac_pa and Tx_mac_pa
Rx_mac_BE and Tx_mac_BE (It seems to me a byte enable signal, but
how it works)

Pkg_lgth_fifo holds the lenghts of thereceived packets?

Also, I am not sure how the host interface works.


Is there an example design which shows the minimal requirements for a
working core?

Regards,
Gabor Wacha

[gao jon]

"pa" means package available. If you rearch the timing diagram, you will figure it out.

"be" means byte enble. There is a 32 bit bus, conseqently the be is 2 bits wide.
2'b00      4 bytes enable
2'b01      1 byte enable
2'b10       2 bytes enable
2'b11       3 bytes enable

[amir mohamad hatami]

could you tell me what 

Rx_mac_rd

Rx_mac_ra

Rx_mac_sop

Rx_mac_eop

mean exactly?

 

[jay prakash]

Hi Amir ,

Have a look at page 26 an 27 in the file "Tri-mode_Ethernet_MAC_Specifications.pdf". There are three timing diagrams, which might explain most of the questions. Only for you some ideas what the signal names mean ;-) :

Rx_mac_ra: RX Read Availible (Package received successfully, ready to save the data)

Rx_mac_rd: RX Read (set by you, enables the data output)
Rx_mac_sop, Tx_mac_sop: Start Of Package (high for one clock cycle)
Rx_mac_eop, Tx_mac_eop: End Of Package (high for one clock cycle), surprise, surprise :-D

I hope this information helps. 

Regards

Jay

 

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[amir mohamad hatami]

it does. thanks

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[amir mohamad hatami]

could you tell me what the differences between Clk_125M       Clk_user    Clk_reg  and can they all be set to 125M?

[tamirci]

Hi Amir,

You say here that "look at page 26 and 27 on specification". I downloaded spec and codes before one month ago but i think the spec in the opencores is not current version. I have specification that has version Rev 0.1 January 25, 2006. And it does not have page 26 and 27.

I think this core is very well and would like to use it. But missing document makes it to use very hard. Please share latest version of specification document.

I will be very pleased if you share some usefull information. I have very limited time to complete a master project and need to send data over ethernet with Spartan 6.

Thanks in advance,

Regards,

14 Temmuz 2014 Pazartesi 14:52:44 UTC+3 tarihinde jay yazdı:

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