Atmel AT91SAM9RL-EK, Руководство пользователя

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4-2 AT91SAM9RL-EK Evaluation Board User Guide
6325A–ATARM–08-Jan-08
4.3 Microcontroller Clock
4.4 Memory
4.5 Miscellaneous
Refer to the TOP level schematic for the PIO usage.
Table 4-3. Microcontroller Clock Configuration
Designation
Default
Setting
Feature
S2 Opened
To use an external source clock, the user has to close
S2 and populate J7. In this case, C16, C17 and J7 have
to be unsoldered.
Table 4-4. Memory Configuration
Designation
Default
Setting
Feature
SDRAM (MN5 & MN6)
R29
R30
Soldered
Soldered
Enables MN5 Chip select access
Enables MN6 Chip select access
NANDFLASH (MN7)
J12
R32
S3
Closed
Soldered
Opened
Enables the use of the NANDFLASH device
Enables the use of the Ready/Busy signal
Disables the write protect
SERIAL DATAFLASH (MN8)
J13
S4
Closed
Opened
Enables the use of the DATAFLASH device
Disables the write protect.
TWI SERIAL EEPROM NOT POPULATED (MN9)
Table 4-5. Miscellaneous
Designation
Default
Setting
Feature
USB HIGH SPEED DEVICE INTERFACE
R75 Soldered USB DEVICE: Enables the use of the USBCNX signal
DBGU COM PORT
R64
R66
Soldered
Soldered
Enables the use of DTXD output signal
Enables the use of DRXD input
RS232 COM PORT: Enable the use of Input/output signals