Manual

165
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
21.6.8.2 Software Configuration
The following configuration has to be performed:
• Assign the EBI CS4 and/or EBI_CS5 to the CompactFlash Slot 0 or/and Slot 1 by setting
the bit EBI_CS4A or/and EBI_CS5A in the EBI Chip Select Assignment Register located in
the bus matrix memory space.
• The address line A23 is to select I/O (A23=1) or Memory mode (A23=0) and the address
line A22 for REG function.
• A23, CFRNW, CFS0, CFCS1, CFCE1 and CFCE2 signals are multiplexed with PIO lines
and thus the dedicated PIOs must be programmed in peripheral mode in the PIO controller.
• Configure a PIO line as an output for CFRST and two others as an input for CFIRQ and
CARD DETECT functions respectively.
• Configure SMC CS4 and/or SMC_CS5 (for Slot 0 or 1) Setup, Pulse, Cycle and Mode
accordingly to Compact Flash timings and system bus frequency.