Figure 2-19, Table 2-19 – Digilent 6003-410-000P-KIT User Manual
Page 64
64
XUP Virtex-II Pro Development System
UG069 (v1.0) March 8, 2005
Chapter 2: Using the System
R
provides a block diagram of the Ethernet interface.
The XUP Virtex-II Pro Development System includes a Dallas Semiconductor DS2401P
Silicon Serial Number (U13). This device provides a unique identity for each circuit board
which can be determined with a minimal electronic interface. The DS2401P consists of a
factory laser programmed, 64-bit ROM that includes a unique 48-bit serial number, an 8-bit
CRC, and an 8-bit family device code. Data is transferred serially via the 1-Wire protocol,
which requires only a single data lead and a ground return. Power for reading the device
is derived from the data line with no requirement for an additional power supply. The
unique 48-bit serial number should not be used as the MAC address for the Ethernet
interface, because this number has not been registered as a valid Ethernet MAC address.
The XUP Virtex-II Pro Development System printed circuit board includes a label that
contains the board serial number, obtained from the DS2401P Silicon Serial Number, as
well as a valid Ethernet MAC address that has been registered with the IEEE. Xilinx
maintains a cross reference list matching the board serial number with the assigned
Ethernet MAC address on the XUP Virtex-II Pro Development System support Web page.
Xilinx provides the IP for the 1-Wire interface and application
Synthesizable
FPGA Interface for Retrieving ROM Number from 1-Wire Devices describes this interface.
Figure 2-19:
10/100 Ethernet Interface Block Diagram
Table 2-19:
10/100 ETHERNET Connections
Signal
Direction
FPGA Pin
I/O Type
Drive
Slew
TX_DATA[0]
O
J7
LVTTL
8 mA
SLOW
TX_DATA[1]
O
J8
LVTTL
8 mA
SLOW
TX_DATA[2]
O
C1
LVTTL
8 mA
SLOW
TX_DATA[3]
O
C2
LVTTL
8 mA
SLOW
TX_ERROR
O
H2
LVTTL
8 mA
SLOW
LXT972A
RJ-45
FPGA
MAC IP
TX_ERROR
TX_ENABLE
TX_DATA[3:0]
RX_CLOCK
RX_DATA[3:0]
RX_ERROR
RX_DATA_VALID
CARRIER_SENSE
COLLISION
MDC
MDIO
TX_CLOCK
UG069_19_012505
Magnetics