Datasheet

 2017 Microchip Technology Inc. DS60001516A-page 149
SAM9G20
19.7.7.2 Software Configuration - Compact Flash True IDE
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 A21 is to select Alternate True IDE (A21 = 1) or True IDE (A21 = 0) modes.
• CFRNW, CFS0, CFCS1, CFCE1 and CFCE2 signals are multiplexed with PIO lines and thus the dedicated PIOs must be pro-
grammed 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.