181
SAM9G45 [DATASHEET]
6438K–ATARM–12-Feb-13
Software Configuration
The following configuration has to be performed:
Assign the EBI CS4 and/or EBI_CS5 to the CompactFlash Slot 0 and/or Slot 1 by setting the bit EBI_CS4A
and/or 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.
A21, 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
CompactFlash timings and system bus frequency.
20.2.9
Programmable I/O Lines Power Supplies and Drive Levels
The power supply pin VDDIOM1 accepts two voltage ranges. This allows the device to reach its maximum speed
either out of 1.8V or 3.3V external memories.
The maximum speed is 133 MHz on the SDCK pin and #SDCK signals loaded with 10 pF. The load on
data/address and control signals are 30 pF for power supply at 1.8V and 50 pF for power supply at 3.3V. The data
lines frequency reaches 133 MHz in DDR2 mode. The other signals (control and address) do not go over 66 MHz.
The EBI I/Os accept two drive levels, HIGH and LOW. This allows to avoid overshoots and give the best perfor-
mance according to the bus load and external memories. Refer to the EBI Chip Select Assignment Register for
more details.
The voltage ranges and the drive level are determined by programming EBI_DRIVE field in the Chip Configuration
registers located in the Matrix User Interface.
At reset the selected default drive level is High.
At reset, the selected voltage defaults to 3.3V typical and power supply pins can accept either 1.8V or 3.3V. The
user must make sure to program the EBI voltage range before getting the device out of its Slow Clock Mode. The
user must make sure to program the EBI voltage range before getting the device out of its Slow Clock Mode.