Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
172
Figure 19-7. CompactFlash Read/Write Control Signals
Multiplexing of CompactFlash Signals on EBI Pins
Table 19-9 and Table 19-10 illustrate the multiplexing of the CompactFlash logic signals with other EBI signals on
the EBI pins. The EBI pins in Table 19-9 are strictly dedicated to the CompactFlash interface as soon as the
EBI_CS4A and/or EBI_CS5A bits(s) of the EBI Chip Select Assignment Register in the Chip Configuration User
Interface is/are set. These pins must not be used to drive any other memory devices.
The EBI pins in Table 19-10 remain shared between all memory areas when the corresponding CompactFlash
interface is enabled (EBI_CS4A = 1 and/or EBI_CS5A = 1)
SMC
NRD_NOE
NWR0_NWE
A23
CFIOR
CFIOW
CFOE
CFWE
1
1
CompactFlash Logic
External Bus Interface
1
1
1
0
A22
1
0
1
0
1
0
Table 19-8. CompactFlash Mode Selection
Mode Base Address CFOE CFWE CFIOR CFIOW
Attribute Memory
Common Memory
NRD NWR0_NWE 1 1
I/O Mode 1 1 NRD NWR0_NWE
True IDE Mode 0 1 NRD NWR0_NWE
Table 19-9. Dedicated CompactFlash Interface Multiplexing
Pins
CompactFlash Signals EBI Signals
CS4A = 1 CS5A = 1 CS4A = 0 CS5A = 0
NCS4/CFCS0 CFCS0 NCS4
NCS5/CFCS1 CFCS1 NCS5
Table 19-10. Shared CompactFlash Interface Multiplexing
Pins
Access to CompactFlash Device Access to Other EBI Devices
CompactFlash Signals EBI Signals
NRD/CFOE CFOE NRD
NWR0/NWE/CFWE CFWE NWR0/NWE
NWR1/NBS1/CFIOR CFIOR NWR1/NBS1
NWR3/NBS3/CFIOW CFIOW NWR3/NBS3
A25/CFRNW CFRNW A25