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Original question:

TXS0108E-Q1: Is suitable for RMII interface ?

TXS0108E-Q1: Is suitable for MII Mode?

virali Chhag
Prodigy 80 points
Part Number: TXS0108E-Q1
Other Parts Discussed in Thread: TXV0108-Q1, LSF0108-Q1, LSF0108, TXS0108E

Tool/software:

Hi Team,

In our design, we are going to use TXS0108E-Q1 IC for MII Mode (Speed: 100Mbps) interface (TX and RX pin connection are connecting in only one Level translator). Can we use this level translator for MII Mode?

Please suggest other level translator for MII mode interface, If it is not suitable for MII Mode.

Specification : 

  1. Voltage is 3.3 V to 1.8V and 1.8V to 3.3V
  2. 10Mbps data rate
  3. Bi-direction.

Regards,

Virali

  • 0
    TI__Mastermind 30736 points

    Hey Virali, 

    Two questions here: 

    1. Can you clarify if system requires 10Mbps or 100Mbps? 

    2. When you mention bi-direction, is each data lane capable of being an input and output? (note the TXS0108E-Q1 tops at 70Mbps for 1.8V<->3.3V translation, so LSF0108-Q1 can be used with strong pullups to reach 100Mbps). Otherwise, if are you referencing to that the signals are fixed direction, but can be different per channel, devices such as TXV0108-Q1/ AXC8T245 can be used here. 

    Regards,

    Jack 

  • 0 in reply to Jack Guan
    Prodigy 80 points

    Hi Jack,

    Please find below response for your queries.

    1. System requires 10Mbps.

    2. Yes, each data lane is capable of being input and output.

    Our requirement:

    1. We want to connect TX and RX lane in same TXS0108E-Q1 IC. Is it possible to connect? (One IC connected input signal:  TXD [3:0], TXEN, TXER and Output signal: TXCLK and CRS).

    2. Ethernet Phy clock Frequency is 2.5MHz (TXCLK and RXCLK), So can we use TXS0108E-Q1 IC?

    Reference: check snapshot for signal which we are used in our design. (3.3V signal is connecting with PHY and 1.8V signal is connecting with Ethernet MAC)

     

    Queries: 

    1. If we have to used LSF0108-Q1 IC for 10Mbps data rate, then we need to connect Pullups resistor?

    2. Is LSF0108-Q1 IC capable to being input and output in same IC? (One IC connected input signal:  TXD [3:0], TXEN, TXER and Output signal: TXCLK and CRS).

    Kindly provides your inputs/suggestion for above requirements/ queries.

     

    Regards,

    Virali.

  • 0 in reply to virali Chhag
    TI__Mastermind 30736 points

    Hey Virali,

    Contradicting to the figure provided, If it is indeed the case that each channel is capable of receiving and sending signals, than the TXS0108E/ LSF0108 can both be used. 10Mbps and the 2.5MHz clock signal are supported by both devices. 

    1. Yes, external pullups would be needed as the LSF is open-drain based translator. 

    2. Yes, LSF is compatible with auto-bidirectional signals. See LSF Logic Minute Videos for intro to how these devices work. 

    Regards,

    Jack