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Ethernet MAC/PHY (U4)
Ethernet
MAC/PHY (U4)
f
Serial Port
Connectors (J19
& J27)
The LAN91C111 (U4) is a mixed signal analog/digital device that
implements protocols at 10 Mbps and 100 Mbps. The control pins of U4
are connected to the Stratix II device so that Nios II systems can access
Ethernet via the RJ-45 connector (RJ1).See Figure 2–4 on page 2–14 . The
Nios II development kit includes hardware and software components
that allow Nios II processor systems to communicate with the
LAN91C111 Ethernet device.
Figure 2–4. Ethernet RJ-45 Connector
The Ethernet MAC/PHY device shares address and data connections
with the flash memory and the SRAM chips. For shared bus information,
see Appendix A, Shared Bus Table
Refer to www.smsc.com for detailed information about the LAN91C111
device.
J19 and J27 are standard DB-9 serial connectors. These connectors are
typically used for communication with a host computer using a standard,
9-pin serial cable connected to (for example) a COM port. Level-shifting
buffers (U52 and U58) are used between J19 & J27 and the Stratix II
device, because the Stratix II device cannot interface to RS-232 voltage
levels directly.
J19 and J27 are able to transmit all RS-232 signals. Alternately, the
Stratix II design may use only the signals it needs, such as J19’s RXD and
TXD . LEDs are connected to the RXD and TXD signals, giving a visual
indication when data is being transmitted or received. Figure 2–5 and
Figure 2–6 show the pin connections between the serial connectors and
the Stratix II device.
2–14
Nios Development Board Reference Manual, Stratix II Edition
Altera Corporation
July 2005
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