Datasheet

172
32072H–AVR32–10/2012
AT32UC3A3
14.6.5.5 Application example
Figure 14-4 on page 172 illustrates an example of a CompactFlash application. CFCS0 and
CFRNW signals are not directly connected to the CompactFlash slot 0, but do control the direc-
tion and the output enable of the buffers between the EBI and the CompactFlash Device. The
timing of the CFCS0 signal is identical to the NCS[4] signal. The CFRNW signal remains valid
throughout the transfer, as does the address bus. The CompactFlash _WAIT signal is con-
nected to the NWAIT input of the Static Memory Controller. For details on these waveforms and
timings, refer to the SMC Section.
Figure 14-4. CompactFlash Application Example with I/O mode
Table 14-8. Shared CompactFlash Interface Multiplexing
Pins
Access to
CompactFlash Device
CompactFlash Signals
NRD CFNOE
NWE0 CFNWE
NWE1 CFNIORD
CFRNW CFRNW
EBI
CompactFlash
Connector
DATA[15:0]
CFRNW
NCS[4]
Pxx
ADDR[10:0]
ADDR[22]
NRD
NWE0
NWE1
CFCE1
CFCE2
NWAIT _WAIT
_CE2
_CE1
_IOWR
_IORD
_WE
_OE
_REG
A[10:0]
_CD2
_CD1
D[15:0]
/OE
/OEDIR
ADDR[21]