Atmel AT43DK370, User Manual

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Hardware Description
3-2 AT43DK370 USB Host/Function Dev. Kit User Guide
3423C–USB–1/04
3.1 Jumper Settings
The AT43DK370 Development Board supports two modes of operation, the default
Standalone (or Flash) Mode and the ICE (In-Circuit Emulator) mode. In Standalone
Mode, the AT43DK370 Development Board executes code from its on board flash
ROM. While in ICE Mode, an In-Circuit Emulator for the ARM processor can be con-
nected through J4 to further facilitate code development. The corresponding jumper
settings for the different modes are shown in Table 3-1.
The AT43USB370 is a dual role processor that can be configured either as a full/low
speed host or a full speed device. Its exact personality is defined by the jumper settings
shown in Table 3-2. Please be aware that the AT43SUB370 can operate either in the
host mode or in the device mode, but not simultaneously.
Table 3-3 contains the jumper settings for the clock source. In normal operations, a
6 MHz crystal clock source is used. For debugging purposes, an external 48 MHz oscil-
lator can be used as the clock source to the AT43USB370 by bypassing its internal PLL.
JP3 was used in DK 1.0 for Revision A of the AT43USB370's minor erratum relating to
DM A acknowledgem ent. T his erratum i s resolved with m inor re-works of the
AT43DK370 Development Board and leaving the JP3 jumper open. Both the re-works
and the JP3 setting are done at the factory.
DK 1.1, or Revision B of the AT43USB370 requires no such workaround. However, to
simplify user usage, JP3 can still be left open, the way it is from the factory setting.
JP12 and JP13 are currently unused and are reserved for future expansion.
Table 3-1. Development Board Environment
Standalone Mode (Default) ICE Mode
JP4 (nRCS<4> is 1) Close: 3-5, 7-9, 2-4 Close: 1-3, 5-7, 2-4
JP7 Close: 1-2 Close: 2-3
Table 3-2. Development Board Configuration
USB Host (Default) USB Function FS
JP5 Close: 2-3 Close: 1-2
JP8 Open Open
JP9 Close Open
JP10 Open Close
JP11 Close Open
Table 3-3. AT43USB370 Clock Source
Internal PLL with 6 MHz Crystal (Default) External 48 MHz Oscillator
JP1 Close: 1-2 Close: 2-3
JP2 Close: 1-2 Close: 2-3