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Altera_Forum
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11 years ago

88E1111 Marvell PHY Chip Clock

Hi Friends. This post is about Marvell 88E1111. It's close to impossible getting any information from them. On connecting the 25MHz crystal to the XTAL1 and XTAL2, does the chip internally...
Altera_Forum's avatar
Altera_Forum
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11 years ago

There are lots of ways to connect the 88E1111. The Terasic DE2-115 dev board uses it. Check the DE2-115 schematic and the Ethernet demos for how it is used on this board. In this design 125CLK is not connected. The transmit clock is the TX_CLK pin. The chip is fed an externally generated 25 MHZ clock in to the XTAL1 pin.

It is possible to get technical info on Marvell products. You need to go through a distributor and sign a NDA. I wouldn't recommend doing an original design with the 88E1111 unless you do this so you can have the documentation available.