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Section 4
Circuit Description
4.1
4.2
4.2.1
4.2.2
4.2.3
AT91M42800A
Processor
Expansion
Connectors and
JTAG Interface
I/O Expansion
Connector
EBI Expansion
Connector
JTAG Interface
Figure 6-1 on page 6-2 shows the AT91M42800A. The footprint is for a 144-pin TQFP
package.
Strap CB20 enables the user to choose between the standard ICE debug mode and the
JTAG boundary scan mode of operation.
The operating mode is defined by the state of the JTAGSEL input detected at reset.
Jumper JP5 (see Figure 6-8 on page 6-9 in Section 6, “Appendix B – Schematics”) can
be removed by the user to allow measurement of the consumption of the whole micro-
controller (V DDIO and V DDCORE ). Jumper JP8 can be removed to measure the core
microcontroller consumption (V DDCORE ).
The two expansion connectors, I/O expansion connector and EBI expansion connector,
and the JTAG interface are described below.
The I/O and EBI expansion connectors’ pinout and position are compatible with other
AT91 evaluation boards (except the I/O expansion connector pinout and position of the
EB40) so that users can connect their prototype daughter boards to any of these evalu-
ation boards.
The I/O expansion connector makes the general-purpose I/O (GPIO) lines, VCC3V3
and Ground, available to the user. Configuration straps CB2, CB3, CB4, CB11, CB13,
CB14, CB15, CB17, CB18 and CB19 are used to select between the I/O lines being
used by the evaluation board or by the user via the I/O expansion connector.
The schematic (see Figure 6-4 on page 6-5 in Section 6, “Appendix B – Schematics”)
also shows the bus expansion connector. The 32 x 2 connector allows the user to
access the data bus, all control bus signals and oscillator output. VCC3V3 and ground
are also available on this connector.
Configuration strap CB1, when open, allows the user to connect the EBI expansion con-
nector to the MPI expansion connector of an AT91EB63 evaluation board without any
conflict.
An ARM ? -standard 20-pin box header (P5) is provided to enable connection of an ICE
interface to the JTAG inputs on the AT91. This allows code to be developed on the
board without using system resources such as memory and serial ports.
AT91EB42 Evaluation Board User Guide
4-1
Rev. 1708C–ATARM–12-May-05
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