Datasheet

SAM9263 [DATASHEET]
Atmel-6249N-ATARM-SAM9263-Datasheet_14-Mar-16
174
20.5.6.3 Read/Write Signals
In I/O mode and True IDE mode, the CompactFlash logic drives the read and write command signals of the SMC
on CFIOR and CFIOW signals, while the CFOE and CFWE signals are deactivated. Likewise, in common memory
mode and attribute memory mode, the SMC signals are driven on the CFOE and CFWE signals, while the CFIOR
and CFIOW are deactivated. Figure 20-5 demonstrates a schematic representation of this logic.
Attribute memory mode, common memory mode and I/O mode are supported by setting the address setup and
hold time on the NCS4 (and/or NCS5) chip select to the appropriate values.
Figure 20-5. CompactFlash Read/Write Control Signals
Table 20-8. 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
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