Digilent chipKIT Network Shield Reference Manual - Page 3

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chipKIT™ Network Shield™ Reference Manual
8. Digital Signal Connector
This connector provides most of the signals used by the Ethernet and USB interfaces from the Max32
board to the Network Shield. The remaining signals are passed through the Network Shield.
2
9. J7: I
C #1 Daisy Chain Connector
This is a 2x4 pin header connector that provides access to the I
power from the 3.3V power bus and ground. This can be used to extend the I
to power an external I
be accessed using this connector.
2
10. J6: I
C #2 Daisy Chain Connector
This is a 2x4 pin header connector that provides access to the I
power from the 3.3V power bus and ground. This can be used to extend the I
to power an external I
connector.
11. Digital Signal Connectors
Some of the signals used by the Network Shield are provided on these connectors. The rest of the
signals are passed through the Network Shield.
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12. J19: I
C
2
Dedicated I
C signals. These signals are connected directly to I
shared with pins 20 and 21 on connector J4.
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chipKIT Network Shield Hardware Description
The following describes the hardware on the Network Shield and how to use it. Appendices at the end show pin-
out and connection tables.
The Network Shield is designed to be used with the chipKIT Max32 board. When used together, the two boards
have the necessary supporting hardware and connectors to use all the advanced communications and networking
features of the PIC32MX795F512L microcontroller on the Max32.
2.1

Ethernet Interface

The Network Shield can interface with 10Mbps or 100Mbps Ethernet networks. The PIC32MX795 microcontroller
on the chipKIT Max32 board contains a 10/100 Ethernet Medium Access Controller (MAC). The Network Shield
provides an SMSC LAN8720 Ethernet Physical Layer Transceiver (PHY). Together, the MAC and PHY provide a
complete 10/100 Ethernet interface.
The RJ45 connector J1 provides the physical connection to an Ethernet network using a standard Ethernet cable.
When the Ethernet controller is enabled in the PIC32 microcontroller, it takes over the use of a number of the
microcontroller pins. All of the signals from these pins are taken from connector J10 on the Network Shield
(connector J8 on the Max32). Three of these signals are also shared with connector J7 on the Max32 and are
analog pins A11, A12, and A13. When the Ethernet interface on the Network Shield is being used, these pins are
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2
C device. Digilent has cables and a selection of I
2
C device. The jumpers for disabling the on-board pull-ups are adjacent to this
2
C signals SDA and SCL as well as
2
C bus off the board and
2
C peripheral modules that can
2
C signals SDA and SCL as well as
2
C bus off the board and
2
C1 on the microcontroller and are
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