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TLK1501

Ignacio Linares
Expert 1655 points
Other Parts Discussed in Thread: TLK1501, TLK3131

I have a customer asking the following:

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We have a design which had a TLK1501 put on it as a backup path to an FPGA.  We would like to pass Ethernet traffic through it, but after reading the datasheet closer, it is not obvious to us that the part is capable of doing that.  Is there a way to do so?

 

Two problems that jump out include:

 

1. Every mention in the datasheet of K23.7 (also known as /R/) refers to always transmitting or receiving TWO K23.7 bytes.  In Ethernet, the second /R/ is only used on odd length packets.

 

2. There are no references to how to transmit a K29.7 (/T/) or K27.7 (/S/)

Is there is any possible way to use this for Ethernet?

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  • 0
    TI__Guru 62920 points

    Hi Ignacio,

    The TLK1501 was designed to be a general-purpose transceiver, so it does not support the full Ethernet K-code set.  It is only capable of transmitting K28.5, K23.7, K30.7, and data codes.  An example of a fully Ethernet-compliant SerDes would be the TLK3131.

    Best regards,
    Max Robertson
    Analog Applications Engineer
    Texas Instruments
    m-robertson@ti.com

  • 0
    Expert 1655 points

    is there a footprint compatible part that does ethernet and can do 1.25 or 3.125 gbps ?  trying to avoid a redesign  

  • 0 in reply to Ignacio Linares
    TI__Guru 62920 points

    Unfortunately, there are no Ethernet parts using that pinout that I know of.  The TLK3131 should support the data rates you mentioned and the full Ethernet code set.  We also have some Gigabit Ethernet SerDes devices that are similar to the TLK1501, but support a 10-bit-wide parallel bus.  This means that the 8b/10b encoding/decoding could be performed externally (e.g., by a MAC).  An example of this type of device would be the TLK2201A.

    Best regards,
    Max