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WiFi module:     WIZ610WI
Microcontroller: LPC1788
Purpose:         Connect it via MII on PCB

I have the following scheme: MAC-to-MAC via MII scheme

  1. Do I need a signal delay on TX_CLK?
  2. On what line and what the value of the resistor to set?
  3. Are there guidelines for the design of such boards?

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1 Answer 1

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In "Errata sheet LPC1788":

3.4  ETHERNET.1: In Ethernet MII mode, the transmit data TXD3:0 and 
transmit enable TX_EN incorrectly reference RX_CLK in data 
transmission

Problem:
In MII mode, the transmit data TXD3:0 and transmit enable TX_EN should reference the 
TX_CLK from the Ethernet PHY. However, due to a configuration error in the chip, the 
transmit data TXD3:0 and transmit enable TX_EN reference RX_CLK in data 
transmission. The consequence of this error is that a small percentage of packets cannot 
be received by the PHY. 

Work-around:
This will be fixed with the next silicon release. 

Note: There is no issue in RMII mode operation.

If I gather the scheme, will it work normal?

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