[ell-i-pcb-design] Re: Initial Hirose DF12-60 stacking I/O expander pin order for ELL-i
- From: Pekka Nikander <pekka.nikander@xxxxxx>
- To: ELL-i PCB design <ell-i-pcb-design@xxxxxxxxxxxxx>
- Date: Fri, 31 Jan 2014 09:01:04 +0200
> For the Ethernet, we need not only TX+/TX- and RX+/RX-, but also the centre
> taps (TXC/RXC) since we have to place the Ethernet termination next to the
> PHY, and the terminating resistors are connected to the centre taps. The
> centre taps will be powered on the PoE board side. The Ethernet leads need
> to be as short as possible.
Timo just told me that actually the centre taps are not needed. Instead we
need a couple of controls from the MCU board to the PoE board (ETH mux input,
SPI chip select). I will revise that part of the connector later today.
--Pekka
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