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H A R D W A R E
signal with a pull-up or pull-down resistor, it is good practice to drive the signal to the DC value
before tri-stating. (So that simulation will match emulation result).
19
Ethernet
An Ethernet interface is available to FPGA B. It is provided by a Vitesse VSC8601 tri-mode
Ethernet PHY. The RJ45 connector can be used to connect to a regular 10Base-T, 100Base-TX,
or 1000Base-T Ethernet network connection.
The VCS8601 device does not contain an Ethernet MAC. The FPGA must implement a
complete network stack to make use of the Ethernet connection. Sorry! I know that’s retarded,
and the DN10,000K10PCI will be better. Until then, check out OpenCores Tri-mode Mac
controller
http://www.opencores.org/projects.cgi/web/ethernet_tri_mode/overview
19.1
MII
The 4-bit GMII interface is the only required interface on the PHY device. The EEPROM,
MDIO, and other signals are only required if you want to put the PHY into a mode that is not
default.
The SMI (MDC, MDIO signals) address is set to 0000. Each Ethernet interface (one for FPGA
D, one for F) is on its own SMI interface.
19.1.1
Electrical
The appropriate electrical standard to use is LVDCI_25. In Gigabit mode (default), the MII
interface runs at 125MHz, DDR.
The CLK_ETH125. Signal should use the SSTL_II_25_DCI signaling standard.
19.1.2
Timing
The board is designed such that when using a DCM in zero-delay mode on the clock,
CLK125_ETH, the interface will meet timing, clocking all IOs on this clock. Alternately, you
DN9002K10PCI User Guide
www.dinigroup.com
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